Given:
K = 0.71 = Kp
The reaction of sulphur with oxygen is
S(s) + O2(g) ---> SO2(g)
initial Pressure 6.90 0
Change -x +x
Equilibrium 6.90-x x
Kp = pSO2 / pO2 = 0.71 = x / (6.90-x)
4.899 - 0.71x = x
4.899 = 1.71x
x = 2.86 atm = pressure of SO2 formed
temperature = 950 C = 950 + 273.15 K = 1223.15 K
Volume = 50 L
Let us calculate moles of SO2 formed using ideal gas equation as
PV = nRT
R = gas constant = 0.0821 L atm / mol K
putting other values
n = PV / RT = 2.86 X 50 / 1223.15 X 0.0821 = 1.42 moles
Moles of Sulphur required = 1.42 moles
Mass of sulphur required or consumed = moles X atomic mass of sulphur
mass of S = 1.42 X 32 = 45.57 grams or 0.04557 Kg of sulphur
Aru is holding a 4 newton box in his arms He walks for 2000 meters while holding the box how much work is done to the box
No work is done on the box as Aru holds and walks with it because the force he applies is perpendicular to the displacement, resulting in zero work according to physics principles.
The question asks us to calculate the work done on a box that is being held and carried over a certain distance. According to the definition of work in physics, work is done when a force causes a displacement in the direction of the force. In this case, Aru is holding a 4 newton box and walking for 2000 meters, but since the force he exerts is perpendicular to the displacement (holding the box does not cause it to move vertically), no work is done on the box in terms of physics.
If the force is perpendicular to the displacement, as it is in Aru's case, this results in zero work being done on the object because the force does not contribute to the displacement in any way.
An example of calculating work done is when a force is applied in the direction of the displacement. For instance: If a force of 10 newtons (F = 10 N) is applied in the direction of displacement and the object moves 2 meters (d = 2 m), then the work done (W) would be calculated as W = F × d, which means W = (10 N)×(2 m) = 20 Joules.
How does the equilibrium change with the removal of hydrogen (H2) gas from this equation? 2H2S ⇌ 2H2(g) + S2(g)
A. Equilibrium shifts right to produce more product.
B. Equilibrium shifts left to produce more reactant.
C. Equilibrium shifts right to produce less product.
D. Equilibrium shifts left to produce less reactant.
Answer : The correct option is, (A) Equilibrium shifts right to produce more product.
Explanation :
According to the Le Chatelier's principle, when we are adding or removing the products or reactants from the reaction, the equilibrium will shift towards that side where the less number of molecule.
The given equilibrium reaction is,
[tex]2H_2S\rightleftharpoons 2H_2(g)+S_2(g)[/tex]
In the given reaction, when we are removing the hydrogen gas from the reaction then the equilibrium will shift towards the right side to produce more product.
Hence, the correct option is, (A)
__________ often cause overactive eye movement. A. Stimulants B. Depressants C. Barbiturates D. None of the above
Stimulants often cause overactive eye movement
Ans (A)
Stimulants are a class of psychoactive drugs that increase the brain activity. They work by acting on the central nervous system and increase the level of mental alertness and impart heightened cognitive functions. Stimulants like nicotine and cocaine cause overactive eye movement.
Answer:
( A). Stimulants is a correct answer.
Explanation:
Stimulants result in the overactive movement of eye.
Stimulants belong to the class psychoactive drugs which cause increase brain function.
Stimulants results in the change of the corneal curvature, and it increases the alertness and energy for a limited period of time.
Ritalin is a class of stimulants known as Methylphenidate and other stimulants like nicotine, cocaine result in overactive movement of the eye.
In this condition, people are not able to concentrate on multiple visual works at the same time.
Generally, when going down a group on the periodic table:
atomic radii decrease
ionic radii increase
electronegativity increases
reactivity decreases
The correct answer is ionic radii increase.
The ionic radii decrease as one move across the periodic table, that is, from left to right, while the ionic radius increases as one move from top to bottom on the periodic table. As one moves down a group in the periodic table, the supplementary layers of electrons are being added that usually results in the increase of the ionic radius as one moves down the periodic table.
How many grams of product are formed from 2.0 mol of N2 (g) and 8.0 mol of Mg(s)? Show all calculations leading to an answer. List 3 indicators of a chemical change.
Balanced chemical reaction happening here is:
3Mg(s) + N₂(g) → Mg₃N₂(s)
moles of product formed from each reactant:
2.0 mol of N2 (g) x 1 mol Mg₃N₂ = 2 mol Mg₃N₂
1 mol N2
and
8.0 mol of Mg(s) x 1 mol Mg₃N₂ = 2.67 mol Mg₃N₂
3 mol Mg
Since N2 is giving the least amount of product(Mg₃N₂) ie. 2 mol Mg₃N₂
N2 is the limiting reactant here and Mg is excess reactant.
Hence mole of product formed here is 2 mol Mg₃N₂
molar mass of Mg₃N₂
= 3 Mg + 2 N
= 101g/mol
mass of product(Mg₃N₂) formed
= moles x Molar mass
= 2 x 101
= 202g Mg₃N₂
202g of product are formed from 2.0 mol of N2(g) and 8.0 mol of Mg(s).
The following are indicators of chemical changes:
Change in Temperature
Change in Color
Formation of a Precipitate
What method can be used to to completely separate a solution containing alcohol and water?
Answer:
Fractional Distillation
Explanation:
Fractional distillation is a type of separating technique used to separate constituents of a mixture (miscible) with varying boiling points. In fractional distillation, heat is applied to the mixture and the constituent with the least boiling point vaporizes out first, then the one with the next boiling point follows (the jars used to obtain the constituents will be changed at different boiling points) and the one with the highest boiling point is obtained last. Alcohol/ethanol has a boiling point of 78°C while water has a boiling point of 100°C hence after exposure to heat, ethanol evaporates out first (and then cooled outside the distilling flask; in a condenser, so it can be converted back to liquid). Since we have just two constituents in this mixture, only water will be left in the distilling flask at about 85°C.
pleaseeeeeeeeeeeee helppppppppppppppppppppp!!! FIRST ONE TO ANSWER WITH THE RIGHT ANSWER GETS BRAINLIEST!!
List three things found on the back of a pattern envelope.
Here you go !!!!! envelope, cutting and sewing instructions, tissue pattern pieces
Describe how light is emitted from an atom. A) As protons absorb energy they travel from the nucleus through the atom emitting light along the way. B) The light is emitted when energy from sunlight is absorbed by the atom to excite a neutron into a higher level. C) When the nucleus absorbs sunlight, photons are energized and move to a higher energy level and are then released. D) Light is emitted from an atom as an electron falls from an excited state to the ground state releasing a photon.
Answer is: D) Light is emitted from an atom as an electron falls from an excited state to the ground state releasing a photon.
Electrons can jump from one energy level to another, absorbing or emitting electromagnetic radiation with a frequency ν (energy difference of the levels).
When electron jump from higher to lower energy level (shell), it emitting (releasing) energy.
For example, when the electron changes from n=4 (fouth shell) to n=2 (second shell), the photons are emitted.
Albert Einstein (1879-1955) proposed that a beam of light is a collection of discrete wave packets (photons) with energy hν, where h is Planck constant and ν is frequency.
The photons have a characteristic energy proportional to the frequency of the light.
Minimum frequency or the threshold frequency is energy below which no photoelectrons are emitted.
Above the minimum frequency, energy depends on the frequency of the light, not on the intensity of the light.
A 1.00 g sample of a hydrogen peroxide (H2O2) solution is placed in an Erlenmeyer flask and diluted with 20 mL of 1 M aqueous sulfuric acid. To this solution is added 0.0200 M KMnO4 solution via a buret, until a pale purple color persists. This requires 22.50 mL of KMnO4 solution. What is the percent by mass of hydrogen peroxide in the original solution? (A) 0.613% (B) 1.53% (C) 3.83% (D) 7.65%
When an alkali metal is involved in a chemical reaction with a nonmetal, what charge will its atoms most likely form?
1-
2+
1+
2-
The charge that alkali metal form when they involve in a chemical reaction with non metals is 1+
Explanation
Metals react by losing electron to form a positively charged ion.
Alkali metal has 1 electron in outermost sub shell which is donated when they react with non metals to form ions with a charge of 1+.
For example sodium (Na) metal with [Ne] 3S¹ electron configuration donate the 1 electron in outermost subshell (3S) to form Na⁺ ion.
Which two particles can form an ionic bond with each other?
A. a negative oxygen ion and a negative chlorine ion
B. a positive sodium ion and a positive magnesium ion
C. a positive calcium ion and a negative oxygen ion
D. a neutral fluorine atom and a negative sulfur io
Answer : The correct option is, (C) a positive calcium ion and a negative oxygen ion.
Explanation :
Ionic compound : ionic compounds are the compounds which are made up of positively charged cation and the negatively charged anion. The bond form between the cation and anion is known as ionic bond.
For example : NaCl, LiF, NaBr, etc.
In option C, a positive calcium ion combine with a negative oxygen ion to give calcium oxide. So, these two particles can form an ionic bond with each other.
While the other options A, B and D can not form an ionic bond with each other.
Therefore, the correct option is C.
table below shows the electronegativities of four elements. Which of the following bonds is the most polar?
carbon - hydrogen
carbon - fluorine
fluorine - fluorine
hydrogen - oxygen
Lets find the electronegativity difference between the bonded atoms;
C-H = 2.6-2.2 = 0.4
C-F = 4.0-2.6 = 1.4
F-F = 4.0-4.0 = 0
H-O = 3.4-2.2 = 1.2
Here the electronegativity difference is highest for C-F bond hence C-F bond is most polar.
What is the main reason why some developing countries fear the increase the free trade policies around the world?
It threatens local industries. This is because local industries are smaller in scale than the industries that have international reach. The local industries cannot compete with the international industries because they cannot keep their prices as competitive because they lack economies of scale.
What is the name for the S2- anion?
sulfate ion
sulfide ion
sulfur ion
sulfur (II) ion
Final answer:
The name for the S²⁻ anion is the sulfide ion, which is derived from the stem name of sulfur with the suffix '-ide' added, followed by 'ion'.
Explanation:
The S²⁻ anion is known as the sulfide ion. When sulfur gains two electrons, it forms a negatively charged ion with 18 electrons and 16 protons, resulting in a 2- charge. According to the nomenclature for monatomic anions, the name of the ion is derived from the element's stem name, with the suffix '-ide' added, and then followed by the word 'ion'. Therefore, the name for S²⁻ is 'sulfur' + '-ide ion', which gives us sulfide ion.
A 100.0 mL sample of a 0.200 M aqueous solution of K2CrO4 was added to 100.0 mL of a 0.100 M aqueous solution of BaCl2. The mixture was stirred and the precipitate was collected, dried carefully, and weighed. How many grams of precipitate should be obtained? The reaction is shown below: K2CrO4(aq) + BaCl2(aq) ď‚® BaCrO4(s) + 2 KCl(aq) A. 2.05 g B. 2.53 g C. 5.07 g D. 6.16 g E. 7.60 g
The mixture was stirred and the precipitate was collected, dried carefully, and weighed. The grams of precipitate should be obtained is 2.53 g. Hence option B is correct.
What is mixture?Mixture is defined as a material composed of two or more chemical compounds that do not chemically combine together. Mixtures are classified into two types: heterogeneous and homogeneous. Heterogeneous mixtures have distinct components, whereas homogeneous mixtures appear uniform throughout.
[tex]\rm K_2CrO_4(aq) + BaCl_2(aq) \rightarrow BaCrO_4(s) + 2KCl(aq)[/tex]
Moles of K₂CrO₄ = Molarity x Volume
= 0.200 x 0.100
= 0.02 moles
Moles of BaCl₂ = 0.1 x 0.100
= 0.01 moles
Moles of BaCrO₄ = 0.01 moles
Mass of BaCrO₄ = 0.01 x 253
= 2.53 grams.
Thus, the mixture was stirred and the precipitate was collected, dried carefully, and weighed. The grams of precipitate should be obtained is 2.53 g. Hence option B is correct.
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When Mrs. Green describes the physical properties of matter she said that physical properties often concern changes in state. One physical property that does not describe a change in state is
Some physical properties of matter do not involve a change in state. An example is density, which is an intensive property that does not depend on the amount of matter. It remains consistent regardless of the state of the substance.
Explanation:Physical properties of matter are characteristics that can be observed without changing the chemical composition of the substance. These properties can often describe changes in state, such as from a solid to a liquid (melting) or a liquid to a gas (boiling). However, there are also other types of physical properties that do not involve a change in state.
One of these physical properties is density. Density does not involve a change in the state of a substance. It is an intensive property, meaning it does not depend on the amount of matter present. It is determined by the mass of an object divided by its volume, and it remains the same regardless of the quantity of the substance you have.
Therefore, Mrs. Green could have been referring to a property like density when she mentioned a physical property that does not describe a change in state.
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Physical properties are characteristics of matter that don't involve a change in the composition of matter. One example is density, which isn't tied to a change of state. Other physical properties include hardness, color, smell, boiling point, and solubility.
Explanation:When Mrs. Green discusses the physical properties of matter, she is referring to characteristics of matter that are not associated with any change in its chemical composition. Physical properties, such as hardness and boiling point, do not involve a change in the composition of matter, hence they do not correspond to a change of state. An example is the density of a material which remains the same regardless of its state (solid, liquid, or gas). Density is therefore a physical property that does not describe a change in state. Other examples can include color, smell, freezing point, boiling point, and solubility.
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In an experiment, 0.6mol of chlorine gas, Cl2, is reacted with an excess of hot aqueous sodium hydroxide. One of the products is a compound of sodium, oxygen and chlorine. Which mass of this product is formed?
A 21.3 B 44.7 C 63.9 D 128
Answer: B) 44.7 g
Explanation:
The equation represent the reaction is
Cl2 + 2NaOH → NaCl + NaClO + H2O
The balanced equation shows that every mole of Cl2 reacts to produce mole of NaClO
0.6 mole of Cl2 will produce 0.6 mole of NaClO
n = mass/molar mass
molar mass of NaClO = 74.5 g/mol
the mass of NaClO = n x molar mass = (0.6 mole) (74.5 g/mol) = 44.7 g
Convert 2.5 grams of water to molecules of water.
A mole of water is 18 g. This is the molar mass of H2O (16 for O plus 2 for 2 H).
So In 2.5 g you have 2.5/18 Moles of water. 2.5/18 * Avogadro constant gives you the number of molecules. This should be 8.37 x 10^22 molecules. Good luck!!
Which part of the fuel cell does A represent?
I think the anwer is electrolyte :)... i had it on a test a couple days ago.
Answer:
The answer is D electrolyte
Explanation:
What is the systematic name of the following compound?
(1 point)
Li2SO3
Lithium Sulfate
Lithium Sulfite
Lithium (II) Sulfide
Sulfurous Lithium
1. A sample of gold (Au) has a mass of 35.12 g.
a. Calculate the number of moles of gold (Au) in the sample and record in Table 1. Show your work.
b. Calculate the number of atoms of gold (Au) in the sample and record in Table 1. Show your work.
2. A sample of table sugar (sucrose, C12H22O11) has a mass of 1.202 g.
a. Calculate the number of moles of C12H22O11 contained in the sample and record in Table 1. Show your work.
b. Calculate the moles of each element in C12H22O11 and record in Table 1. Show your work.
c. Calculate the number of atoms of each type in C12H22O11 and record in Table 1. Show your work.
Table looks like this:
Column 1 Column 2 Column 3
Au C12H22O11
Mass (grams)
Molar mass (g/mol)
Moles of each element C:
H:
O:
Atoms of each element C:
H:
O:
Please help fast!
1a) Answer is: the number of moles of gold (Au) in the sample is 0.178 mol.
m(Au) = 35.12 g; mass of gold.
M(Au) = 196.97 g/mol; molar mass of gold.
n(Au) = m(Au) ÷ M(Au).
n(Au) = 35.12 g ÷ 196.97 g/mol.
n(Au) = 0.178 mol; amount of gold.
1b) Answer is: the number of atoms of gold (Au) is 1.073·10²³.
N(Au) = n(Au) · Na.
N(Au) = 0.178 mol · 6.022·10²³ 1/mol.
N(Au) = 1.073·10²³.
2a) Answer is: 0.0035 moles of sucrose.
m(C₁₂H₂₂O₁₁) = 1.202 g; mass of sucrose.
M(C₁₂H₂₂O₁₁) = 12 · Ar(C) + 22 · Ar(H) + 11 · Ar(O) · g/mol.
M(C₁₂H₂₂O₁₁) = 12 · 12.01 + 22 · 1.01 + 11 · 16 · g/mol.
M(C₁₂H₂₂O₁₁) = 342.3 g/mol; molar mass of sucrose.
n(C₁₂H₂₂O₁₁) = m(C₁₂H₂₂O₁₁) ÷ M(C₁₂H₂₂O₁₁).
n(C₁₂H₂₂O₁₁) = 1.202 g ÷ 342.3 g/mol.
n(C₁₂H₂₂O₁₁) = 0.0035 mol; amount of sucrose.
2b) n(C) = 12·n(C₁₂H₂₂O₁₁).
n(C) = 12 · 0.0035 mol.
n(C) = 0.042 mol; amount of carbon in sucrose.
n(H) = 22·n(C₁₂H₂₂O₁₁).
n(H) = 22 · 0.0035 mol.
n(H) = 0.077 mol; amount of hydrogen in sucrose.
n(O) = 11·n(C₁₂H₂₂O₁₁).
n(O) = 11 · 0.0035 mol.
n(O) = 0.0385 mol; amount of oxygen atoms in sucrose.
2c) N(C) = n(C) · Na.
N(C) = 0.042 mol · 6.022·10²³ 1/mol.
N(C) = 2.53·10²²; number of carbon atoms in sucrose.
N(H) = n(H) · Na.
N(H) = 0.077 mol · 6.022·10²³ 1/mol.
N(H) = 4.63·10²²; number of hydrogen atoms in sucrose.
N(O) = n(O) · Na.
N(O) = 0.0385 mol · 6.022·10²³ 1/mol.
N(O) = 2.31·10²²; number of oxygen atoms in sucrose.
Na is Avogadro constant.
Which section of ocean floor is near the coastlines of all continents?
neritic zone
open ocean
shallow ocean
intertidal zone
The correct answer is intertidal zone.
The littoral zone or the intertidal zone, also known as the foreshore or the seashore, refers to the area, which is above the water at low tide and below the water at high tide. This zone incorporates different types of habitats, with animals like starfish sea urchin, and various species of coral. This zone is situated close to the coastlines of all the continents.
Answer: shallow ocean
Explanation:
shallow near the coastlines
only one that could make sense
The half-life of polonium-218 is 3.0 minutes. If you start 10.0 g, how long will it be before only 5.0 g remains?
The half life of an isotope means how long it will take for the amount of given isotope to decay to only 1/2 of the original amount.
If you start with 10.0g of polonium-218 and the half life is 3.0 minutes, then in 3.0 minutes you will have half of the original amount
Half of the original amount is equal to 5.0g
The answer is 5.0g
It will take 3.0 minutes for the amount of polonium-218 to decrease from 10.0 g to 5.0 g, corresponding to its half-life duration.
The question is about the half-life of polonium-218, which is a Chemistry concept dealing with the radioactive decay of isotopes. The half-life is the time required for half of the radioactive nuclei in a sample to decay. In this case, we're asked to find out how long it takes for a 10.0 g sample of polonium-218 to decay to 5.0 g. Because the half-life of polonium-218 is given as 3.0 minutes, it will take exactly one half-life period for the amount of polonium-218 to decrement from 10.0 g to 5.0 g.
Therefore, it will take 3.0 minutes for half of the initial sample to remain, going from 10.0 g to 5.0 g.
( 20 points ) Jerri is planning to rebuild the engine of an antique car. She has chosen all the materials she needs including a high quality synthetic oil to reduce friction in the engine. What effect will reducing friction have on the engines performance?
A Reduces friction means reduced efficiency
B Reduces friction means reduced heat transfer
C Reduces friction means increased efficiency
D Reduces friction means increased heat transfer
The option, B. Reduced friction means reduced heat transfer " is correct.
Answer:
Reduces friction means increased efficiency
Explanation:
Friction is known to decrease efficiency in machines. In redesigning the engine if the antique car, and the inclusion of oil to reduce friction in the engine, she aims to improve the efficiency of the engine.
Friction leads to lost work in mechanical systems. Friction accounts for the fact that the efficiency of an engine is never 100% since some of the input work is lost as friction.
Hence decreasing the friction improves the efficiency of the machine.
MAXIMUM POINTS!! PLEASE HELP!
If copper metal pieces were added to an aqueous solution of silver nitrate, the Silver would be replaced in a single replacement reaction forming aqueous copper (II) nitrate and solid silver.
1. Write a balanced chemical equation for the reaction.
2. How much silver is produced is 15.00 grams of Cu is added to the solution of excess silver nitrate?
3. If silver metal sells for $4.50/ounce, how much would the Silver collected be worth? (1 gram = 0.0353 oz)
1.The balanced chemical equation is as below
Cu + 2 Ag(NO)₃ → Cu(NO₃)₂ +2 Ag
2.The much silver produced is 50.9 g
Step 1: find the moles of Cu
moles = mass÷ molar mass
from periodic table the molar mass of Cu = 63.5 g/mol
moles is therefore = 15.00 g÷ 63.5 g/mol = 0.236 moles
Step 2: use the mole ratio to determine the moles of Ag
from equation above Cu:Ag is 1:2
therefore the moles of Ag =0.236 moles x 2/1 =0.472 moles
Step 3: find the mass of Ag
mass = moles x molar mass
from periodic table the molar mass of Ag =107.87 g/mol
mass = 0.472 moles x 107.87 g/mol = 50.9 g
3. The much silver collected worth is 1.797 oz
convert 50.9 g to oz
that is 1 gram = 0.0353 oz
50.9 grams =? oz
by cross multiplication
={(50.9 grams x 0.0353 oz) / 1 gram} =1.797 oz
The amount of silver produced from 15.00 grams of copper is approximately 50.97 grams. The value of this silver is [tex]$7.995.[/tex]
The answer to the question is as follows:
1. The balanced chemical equation for the reaction between copper metal and silver nitrate is:
[tex]\[ \text{Cu}(s) + 2\text{AgNO}_3(aq) \rightarrow \text{Cu(NO}_3)_2(aq) + 2\text{Ag}(s) \][/tex]
2. To find out how much silver is produced when 15.00 grams of Cu is added to the solution, we first need to use the molar mass of copper to convert grams of copper to moles. The molar mass of copper (Cu) is approximately 63.55 g/mol.
[tex]\[ \text{Moles of Cu} = \frac{\text{Mass of Cu}}{\text{Molar mass of Cu}} = \frac{15.00 \text{ g}}{63.55 \text{ g/mol}} \approx 0.236 \text{ mol} \][/tex]
From the balanced equation, 1 mole of Cu produces 2 moles of Ag. Therefore, the moles of Ag produced are:
[tex]\[ \text{Moles of Ag} = 2 \times \text{Moles of Cu} = 2 \times 0.236 \text{ mol} \approx 0.472 \text{ mol} \][/tex]
The molar mass of silver (Ag) is approximately 107.87 g/mol. We can now convert the moles of Ag to grams:
[tex]\[ \text{Mass of Ag} = \text{Moles of Ag} \times \text{Molar mass of Ag} = 0.472 \text{ mol} \times 107.87 \text{ g/mol} \approx 50.97 \text{ g} \][/tex]
3. To find out the value of the silver produced, we need to convert grams of silver to ounces and then multiply by the price per ounce. The conversion factor is 1 gram = 0.0353 ounces.
[tex]\[ \text{Ounces of Ag} = \text{Mass of Ag} \times \text{Conversion factor} = 50.97 \text{ g} \times 0.0353 \text{ oz/g} \approx 1.799 \text{ oz} \][/tex]
Now, we multiply the mass of silver in ounces by the price per ounce to find the value:
[tex]\[ \text{Value of Ag} = \text{Ounces of Ag} \times \text{Price per oz} = 1.799 \text{ oz} \times \$4.50/\text{oz} \approx \$7.995 \][/tex]
Therefore, the silver collected would be worth approximately $7.995.
In summary, the balanced chemical equation for the reaction is:
[tex]\[ \text{Cu}(s) + 2\text{AgNO}_3(aq) \rightarrow \text{Cu(NO}_3)_2(aq) + 2\text{Ag}(s) \][/tex]
The amount of silver produced from 15.00 grams of copper is approximately 50.97 grams. The value of this silver is approximately $7.995.
Place the items in order from the largest wavelength to the shortest wavelength.
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Blue visible
Gamma radiation
Green visible
Infrared
Microwave
Orange visible
Radio wave
Red visible
Ultraviolet (UV)
Violet visible
X-ray
Yellow visible
The order from longest to shortest wavelength is;
Radio wave (longest wavelength)
Microwave
Infrared
Red visible
Orange visible
Yellow visible
Green visible
Blue visible
Violet visible
Ultraviolet (UV)
X-ray
Gamma radiation (shortest wavelengths)
This is referred to as the electromagnetic spectrum.
The EM radiation types ordered from largest to shortest wavelength are: Radio wave, Microwave, Infrared, Red visible, Orange visible, Yellow visible, Green visible, Blue visible, Violet visible, Ultraviolet (UV), X-ray, and Gamma radiation.
To place the various types of electromagnetic (EM) radiation in order from largest wavelength to shortest wavelength, we'll refer to the relationship between wavelength, frequency, and energy of EM waves. As the wavelength decreases, both the frequency and energy increase. Here's the correct order from largest to shortest wavelength:
Radio waveMicrowaveInfraredRed visibleOrange visibleYellow visibleGreen visibleBlue visibleViolet visibleUltraviolet (UV)X-rayGamma radiationWithin the visible light spectrum, remember ROY G BIV as a mnemonic to order the colors from longest (red) to shortest (violet) wavelengths. Beyond the visible spectrum, infrared radiation has longer wavelengths than visible red light, whereas ultraviolet light, X-rays, and gamma rays have shorter wavelengths than visible violet light.
Which of the following is not an indication of a chemical change?
formation of a precipitate
formation of a gas
the container gets hot
the substance dissolves
Answer: the substance dissolves
Explanation: Chemical change is the change in which chemical composition of the substance changes.
Chemical changes are accompanied by following changes:
a) formation of precipitate
b) release or absorption of energy
c) formation of gas
d) change in color
When a substance dissolves, it only changes its state and thus there is no change in chemical composition.
Answer: Option (d) is the correct answer.
Explanation:
A chemical change is defined as the change that results in the formation of new compounds due to change in chemical composition of reactants.
For example, when any two aqueous solutions chemically react with each other then it results in the formation of an insoluble solid that is known as a precipitate.
Also, a gas is released when two substances chemically react together.
It is known that in an exothermic reaction heat is released. So, when a container gets hot then it means two or more substance have chemically react together due to which an exothermic reaction has taken place.
On the other hand, when no change in chemical composition of reactants occur then it means no chemical change has taken place.
For example, when NaCl is dissolved in water then it dissociates into sodium and chlorine ions.
This means no new compound has formed. As by evaporating water, crystals of NaCl can be formed again.
So, when a substance dissolves in water then it means no chemical change has taken place unless and until a new compound is not formed.
Thus, we can conclude that the substance dissolves is not an indication of a chemical change.
Which of the following statements is true based on the kinetic-molecular theory of matter?
When the volume of a gas decreases, the pressure increases.
When the pressure of a gas decreases, the temperature increases.
When the volume of a gas increases, the temperature decreases.
When the pressure of a gas increases, the volume increase
Answer:
The correct statement is :When the volume of a gas decreases, the pressure increases.
Explanation:
Main point of kinetic matter theory:
Matter is made of constantly moving small particles.All matter posses some energy which also depends upon the temperature of the matter.Solid possess least amount of energy where as gases posses grater amount of energy.Change in state of matter occur when change in energy takes place.There are space between the particles of matter.As matter transits from solid to gas these space between particles increases.Attractive force between the particles increases when particle moves closer to each other.When we increase the pressure of the on the particles of matter the space between them will get decrease due to which attractive force between the particles will also get increase by which they will come closer and result in decrease in volume of the matter.
Question 1(Multiple Choice Worth 4 points) (04.05 LC) What is the oxidation number of manganese in MnO41−? +3 +4 +7 +8 Question 2(Multiple Choice Worth 4 points) (04.05 LC) Which of the following reactions could be used to power a battery because of the transfer of electrons? Pb22+ + 2Br− → PbBr CaCl2 + 2NaOH → Ca(OH)2 + 2NaCl KOH + HCl → KCl + H2O Zn + Cu2+ → Zn2+ + Cu Question 3(Multiple Choice Worth 4 points) (04.05 MC) Read the following chemical equation: 2Al + 3Br2 → 2AlBr3 Which statement best identifies and describes the oxidizing agent in the reaction? Al is the oxidizing agent because its oxidation number increases. Al is the oxidizing agent because its oxidation number decreases. Br2 is the oxidizing agent because its oxidation number increases. Br2 is the oxidizing agent because its oxidation number decreases. Question 4(Multiple Choice Worth 4 points) (04.05 MC) In which of the following reactions is chlorine (Cl) oxidized? Br2 + 2Cl− → Cl2 + 2Br− Cl2 + 2e− → 2Cl− 2ClO3− + 12H+ → Cl2 + 6H2O 2Na + Cl2 → 2NaCl Question 5(Multiple Choice Worth 4 points) (04.05 MC) The diagram shows the setup of an experiment. A few observations of the experiment are listed in the table below the diagram. A beaker filled three-fourths with a liquid labeled colorless silver nitrate solution is shown. A small strip is shown inside the beaker. The strip is labeled copper strip. The title of the image is Experimental Setup. Experimental Observations Observation Description 1 Solution turned blue 2 Gray particles were deposited on the edge of the strip Which of the following is the correct explanation for one of the given observations? Observation 2 is a result of nitrate ions moving into the solution. Observation 1 is a result of copper ions moving into the solution. Observation 1 is a result of silver atoms losing one electron. Observation 2 is a result of silver ions losing one electron.
1) Answer is: the oxidation number of manganese in MnO₄⁻ is +7.
Permanganate anion has negative charge 1-.
Oxygen (O) in permanganate anion has oxidation number -2.
x + 4 · (-2) = -1.
x - 8 = -1.
x = +7; oxidation nzmber of manganese.
Oxidation number shows the degree of oxidation of an atom in a chemical compound.
2) Answer is: Zn + Cu2+ → Zn2+ + Cu.
In this chemical reaction, there is transfer of electrons from zinc (Zn) to copper (Cu). Zinc change oxidation number from 0 to +2 (lost electrons) and copper change oxidation number from +2 to 0 (gain electrons).
Oxidation half reaction: Zn⁰ → Zn²⁺ + 2e⁻.
Reduction half reaction: Cu²⁺ + 2e⁻ → Cu⁰.
In other chemical reactions, there is no change of oxidation number of elements.
3) Answer is: Br2 is the oxidizing agent because its oxidation number decreases.
Balanced chemical reaction: 2Al + 3Br₂ → 2AlBr₃.
In this chemical reaction, aluminium change oxidation number from 0 to +3 (lose electrons) and bromine change oxidation number from 0 to -1 (gain electrons, reduced).
Oxidizing agent is a substance that has the ability to oxidize other substances, to cause them to lose electrons.
In oxido-reduction reaction, at least one element lose and one element gain electrons.
4) Answer is: Br2 + 2Cl− → Cl2 + 2Br⁻.
Oxidation is increase of oxidation number.
In this balanced chemical reaction, chlorine change oxidation number from -1 (Cl⁻) to oxidation number 0 (Cl₂).
Oxidation half reaction: 2Cl⁻ → Cl₂⁰ + 2e⁻.
Reduction half reaction: Br₂ + 2e⁻ → 2Br⁻.
In other chemical reactions, chlorine is reduced.
5) Answer is: Observation 1 is a result of copper ions moving into the solution.
The reactivity series is a series of metals from highest to lowest reactivity. Metal higher in the reactivity series will displace another.
Copper (Cu) is higher in activity series than silver (Ag), so copper lose electron and silver gain electrons.
Copper is oxidized (increase of oxidation number) and silver is reduced.
Answer:
There's no one-upping that one so I'll just tell you that they were right on my test :)
Explanation:
you're welcome
Which is true about each element in a period or horizontal row of the periodic table?
A.
Each element has one more outer shell than the element before it.
B.
Each element has one more outer electron than the element before it.
C.
Each element has one more isotope than the element before it.
D.
Each element bonds with the element before it.
The answer is B as going from left to right on the periodic table elements increase by 1 in valence electrons
Valence electrons : The electrons on the outermost shell