Answer:
B. Changes in energy in systems.
Explanation:
Thermodynamics is a branch of physics which deals with heat and temperature in relation to energy work radiation and characteristics of matter.
This field studies the causes of energy changes and the effects of energy changes to chemical and physical systems.
Thermodynamics relates B) changes in energy in systems.
Explanation:Thermodynamics is the part of material science that manages warmth and temperature, and their connection to energy, work, radiation, and properties of issue. The conduct of these amounts is administered by the four laws of thermodynamics which pass on a quantitative depiction utilizing quantifiable naturally visible physical amounts, yet might be clarified as far as tiny constituents by factual mechanics.
Thermodynamics applies to a wide assortment of subjects in science and building, particularly physical science, concoction designing and mechanical designing, yet in addition in fields as intricate as meteorology.
Complete the statements based on water’s polarity and ability to form hydrogen bonds. Water’s boiling point is abnormally than expected. Water has a surface tension, allowing adhesion, cohesion, and capillary action. Water has a capacity to retain heat, keeping moderate climates warmer in the winter. Water as it freezes, so ice floats when expected to sink.
answers are higher high high expands
Answer:
1 Higher
2 High
3 High
4 Expands
Explanation:
Answer:
a) Water's boiling point is abnormally higher than expected
b) Water has a high surface tension allowing adhesion, cohesion and capillary action.
c) Water has a high capacity to retain heat, keeping moderate climates warmer in the winter.
d) Water expands as it freezes, so ice floats when expected to sink.
Explanation:
a) Because of its small molecular weight, it's expected that the water has a low boiling point, but the abillity to make hydrogen bonds generates an atraction force between the molecules much more stronger that expected.
This phenomenom implies that the water has higher boiling point than other heavier compounds.
b) The high surface tension its the result of the hydrogen bonds and the polarity of the water molecules, giving the water molecules stronger bonds and like a very strong net, makes it harder to get through.
This is the cause of the listed phenomena: cohesion, adhesion and capillary action.
c) Another effect of the hydrogen bonds of the water is its high thermal capacity.
The hydrogen bonds are the strongest of the molecular bonds (H bonds, dipole-dipole and London) and the stronger the bond is, the higher the amount of energy (in this case heat) it can absorb before its rupture.
This is why water have a high thermal capacity compared with other molecules that only have London or dipole bonds.
d) Water expands when it freezes because the molecules rearrange and during that, many of the hydrogen bonds break.
When that happens, the water molecules have a weaker attraction than before and in consecuence the water (ice) expands.
Also, ice floats beacuse once it expands it has a lower density compared to the water.
BRAINIEST AND MAX POINTS
The diagram below shows four processes, A, B, C, and D, by which carbon circulates between the atmosphere, plants, and animals.
Which processes represent respiration?
Process A and Process C
Process B and Process D
Process A and Process D
Process B and Process C
Answer:
precess a and b
Explanation:
Answer: I believe the answer is A) Process A and Process C !!!!!!!!
0.0006510 kg has
how many significant figures.
Answer:
4 significant figures as zeros after decimal should not be counted
Explanation:
Please mark brainliest and have a great day!
Answer:
4 significant figures
Given pH = 6.75,
Is this acidic, basic or neutral?
How do you know?
Answer:
Acidic.
Explanation:
pH is a logarithmic function of [H+]:
pH = −log[H+]
pH is usually (but not always) between 0 and 14. Knowing the dependence of pH on [H+], we can summarize as follows:
If pH < 7, then the solution is acidic.
If pH = 7, then the solution is neutral.
If pH > 7, then the solution is basic.
Given pH is 6.75 so it is acidic.
How do limiting factors most affect population size?
O
stop population growth
restrict population growth
increase population size
result in positive impacts
O
Answer:
restrict population growth ( second choice).
HELP NEED HELP PLEASE !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer: B) 4.2 M
Explanation:
Molarity = moles of solute/litre of solution
1560mL/1000 = 1.56 litres
6.5/1.56 = x/1
x = 4.2
M of solution = 4.2
According to Boyle's law, what would happen to the temperature of a gas if the pressure were halved as the number of moles and the volume were held constant?
A.The temperature would double.
B.The temperature would be reduced by half.
C.The temperature would quadruple.
D.The temperature would be one-quarter of its original value.
According to Boyle's law, the temperature would double of a gas if the pressure were halved as the number of moles and the volume were held constant. Hence, option A is correct.
What is Boyle's law?Boyle's law states that at constant temperature, the pressure exerted by a gas is inversely proportional to the volume occupied by it.
If temperature is held constant, the equation is reduced to Boyle's law. Therefore, if you decrease the pressure (P↓) of a fixed amount of gas, its volume (v ↑) will increase.
(P↓) → (v ↑)
P∝ [tex]\frac{1}{V}[/tex]
However, if you were to maintain a constant volume while decreasing pressure, the temperature would also have to decrease.
Thus, according to Boyle's law, the temperature would double of a gas if the pressure were halved as the number of moles and the volume were held constant.
Hence, option A is correct.
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You start with 0.050 moles of ammonia in 500. mL of water. The equilibrium constant Keq is 1.8 × 10–5. What is the pH of this solution at equilibrium? Please show work!
Answer:
[tex]\boxed{11.13}[/tex]
Explanation:
The chemical equation is
[tex]\rm NH$_{3}$ + \text{H}$_{2}$O \, \rightleftharpoons \,$ NH$_{4}^{+}$ +\text{OH}$^{-}$[/tex]
For simplicity, let's rewrite this as
[tex]\rm B + H$_{2}$O \, \rightleftharpoons\,$ BH$^{+}$ + OH$^{-}$[/tex]
1. Initial concentration of NH₃
[tex]\text{[B]} = \dfrac{\text{moles}}{\text{litres}} = \dfrac{\text{0.050 mol}}{\text{0.500 L}} = \text{0.100 mol/L}[/tex]
2. Calculate [OH]⁻
We can use an ICE table to do the calculation.
B + H₂O ⇌ BH⁺ + OH⁻
I/mol·L⁻¹: 0.100 0 0
C/mol·L⁻¹: -x +x +x
E/mol·L⁻¹: 0.100 - x x x
[tex]K_{\text{b}} = \dfrac{\text{[BH}^{+}]\text{[OH}^{-}]}{\text{[B]}} = 1.8 \times 10^{-5}\\\\\dfrac{x^{2}}{0.100 - x} = 1.8 \times 10^{-5}[/tex]
Check for negligibility:
\[tex]\dfrac{0.100 }{1.8 \times 10^{-5}} = 5600 > 400\\\\ x \ll 0.100[/tex]
3. Solve for x
[tex]\dfrac{x^{2}}{0.100} = 1.8 \times 10^{-5}\\\\x^{2} = 0.100 \times 1.8 \times 10^{-5}\\\\x^{2} = 1.80 \times 10^{-6}\\\\x = \sqrt{1.80 \times 10^{-6}}\\\\x = \text{[OH]}^{-} = 1.34 \times 10^{-3} \text{ mol/L}[/tex]
4. Calculate the pH
[tex]\text{pOH} = -\log \text{[OH}^{-}] = -\log(1.34 \times 10^{-3}) = 2.87\\\\\text{pH} = 14.00 - \text{pOH} = 14.00 - 2.87 = \mathbf{11.13}\\\\\text{The pH of the solution at equilibrium is } \boxed{\mathbf{11.13}}[/tex]
How are nuclear reactions different from chemical reactions?
Select all that apply.
In nuclear reactions, the identities of the elements change.
In nuclear reactions, the identities of the elements stay the same.
In nuclear reactions, the reactions happen at a set rate.
In nuclear reactions, the reactions happen at a varied rate.
Explanation:
Nuclear reactions are defined as the reaction in which there occurs change in the nucleus of an atom due to change in number of protons or neutrons of an atom.
For example, [tex]^{2}_{1}H + ^{2}_{1} \rightarrow ^{4}_{2}He[/tex] is a nuclear reaction.
Hence, identity of the element changes in a nuclear reaction. Also, nuclear reaction can occur at varied rates as they are not affected by temperature, pressure or catalyst.
Whereas a chemical reaction is defined as the reaction where there occurs exchange of electrons between the combining atoms.
For example, [tex]2Na(s) + Cl_{2}(g) \rightarrow 2NaCl[/tex] is a chemical change.
Thus, we can conclude that nuclear reactions are different from chemical reactions as follows.
In nuclear reactions, the identities of the elements change.In nuclear reactions, the reactions happen at a varied rate.A group of students working in a high school chemistry lab believe they have discovered a new element! How exciting? Upon further testing by scientists (with better equipment), it is found that the new element contains 74 protons and 110 neutrons.
What is the atomic number?
What is the mass number?
Is this a new element? Explain.
Give the name and symbol for this element.
Is it solid, liquid, or gas? Explain
Answer:
Explanation:
Information given about the element:
Number of protons = 74
Number of neutrons = 110
For the atomic number:
Neutral atoms such as this one would have their atomic number to be the same with their number of electrons and protons:
atomic number = number of protons = number of electrons
The atomic number would therefore be 74
For the mass number:
The mass of an atom is centrally concentrated within the tiny nucleus. The mass number is the sum of protons and neutrons in an atom. Protons and neutrons are nuclear particles and are called nucleons:
Mass number = number of protons + number of neutrons = 74+110=184
Is this a new element?
From the peroidic table, tungsten(W) perfectly fits this description of the atom. It has an atomic number of 74 and a mass number of approximately 184. The element is not a new element.
Is it solid, liquid, or gas?
The element is a hard metallic solid. It is a classified as a transition metal on the periodic table. Transition metals have very unique metals and are mostly solids.
Answer:
1) The atomic number of this element is 74, because number of protons = atomic number
2) Mass number of this element is 184
Ar=Z+N=74+110=184
3) It isn't a new element. An element with such atomic and mass numbers exists
4) It is Wolfram. Symbol: W
5) Solid
Sorry if I made mistakes. I started learning English recently
What type of solution is formed if 10 g of kclo3 are dissolved in 100g of water at 30
Answer:
Saturated solution.
Explanation:
Kindly see the attached image, the curve with brown line is for KClO₃, and according to the curve at 30 °C the solubility of KClO₃ per 100 g of water is 10 g.So, 10.0 g of KClO₃ forms a saturated solution.
When 10 g of KClO₃ are dissolved in 100 g of water at 30 degrees Celsius, a saturated solution is likely formed because the solubility of KClO₃ increases with temperature and is sufficient to dissolve this amount at 20 degrees Celsius.
The question is referring to the process of dissolving a chemical compound in water, which is a chemistry topic commonly studied in high school. When 10 g of KClO₃ (potassium chlorate) are dissolved in 100 g of water at 30℃, the type of solution that is formed depends on the solubility of KClO₃ at that temperature. Assuming the question implies 30 degrees Celsius, potassium chlorate has a solubility of about 7 g per 100 mL of water at 20℃. Since solubility generally increases with temperature, it's likely that the 10 g of KClO₃ will fully dissolve in 100 g of water at 30℃ to form a saturated solution. If all the solute dissolves, the solution is known as saturated; if the solute does not fully dissolve, any undissolved solute would result in a supersaturated solution if the excess was initially forced to dissolve under different conditions, or an unsaturated solution if there is still room for more solute to dissolve.
molar mass of fe2o3 g/mol
Answer:
159.7
Explanation:
hope this helps
The first step of the water cycle is that water _______________ into the air.
Answer:
evaporates
Explanation:
the heat from the sun causes it to evaporate
How many grams of aluminum are in 0.58 moles of Al2O3.2H:0?
Answer:
80.04 gram
Explanation:
mass = moles × relative formula mass
= 0.58×138
= 80.04
Why does a red shoe appear red in daylight
Answer:
Because it does
Explanation:from sun light DUHHHH
Elements that form ionic bonds generally have how many valence electrons? ± 1 or ± 2 ± 2 or ± 3 ± 4 ± 5
Answer:
± 1 or ± 2
Explanation:
Electrovalent bonds are chemical bonds that are established on the premise of transferring electrons between two atoms.
In this bond type, a higly electronegative atom, typically a non-metal receives electrons from an atom with lesser electronegativity, a metal.
To know the number of electrons involved in forming electrovalent bonds, we typically look at the groups of atoms that combines to form the bond.
Metals are found in group I and II on the periodic table. Metals are electropositive and are good electron donors. These metals have 1 and 2 electrons in their valence shell respectively. In like manners, the more electronegative atoms are found in group VI and VII. The elements in these groups are non-metals with high electronegativity and requires just 1 and 2 electrons to complete their octet.
Answer:
± 1 or ± 2
Explanation:
What is the percent by mass of sodium in Na2SO4?
Answer:
= 32.39 %
Explanation:
The relative atomic mass of sodium is 23, sulphur 32 while oxygen as a relative atomic mass of 16.
I mole of Na₂SO₄ has a relative mass of 2(23) + 32 + 4(16) = 142 grams
Of the value 142, the contribution of sodium is 2×23 =46
Thus the % composition is calculated:
46/142×100%= 32.39%
The following chemical equation is not balanced.
Ca + AIPO4 — Al + Caz(PO4)2
When the equation is balanced, what is the coefficient for pure aluminum
(AI)?
A) 1
B) 2
C) 4
D 8
Answer:
3Ca + 2AlPO4 = Ca3(PO4)2 + 2Al.
That is B
Answer:
The stoichiometric coefficient of aluminium is 2 that is option B is correct.
Explanation:
Stoichiometric coefficient is the numeral coming or written before the symbol of compound or an element in balanced chemical reaction equation.
[tex]3Ca + 2AIPO_4 \rightarrow 2Al + Ca_3(PO_4)_2[/tex]
According to stoichiometry, 3 moles of calcium reacts with 2 moles of aluminum phosphate to give 2 moles of aluminium and 1 mole of calcium phosphate.
The stoichiometric coefficient of calcium is = 3
The stoichiometric coefficient of aluminum phosphate = 3
The stoichiometric coefficient of aluminium = 2
The stoichiometric coefficient of calcium phosphate = 1
pls help!!
Explain the resonance structures for the nitrate ion, NO3−.
Answer:
Resonance structures for the nitrate ion exist because there are more than one Lewis Structures for this ion.
Explanation:
How many bonds in each nitrate ion?
To answer this question, start by considering how many electrons each atom need for an octet.
Each N atom needs three electrons to achieve an octet.Each O atom need two electrons to achieve an octet.The three O atoms and one N atom in each nitrate ion will need [tex]3\times 2 + 3 = 9[/tex] electrons in total to be stable. However, the ion carries a charge of [tex]-1[/tex]. In other words, atoms in the ion have already acquired one extra electron. Now they need only [tex]9 - 1 = 8[/tex] electrons.
Atoms share electrons by forming bonds. In effect, each chemical bond (a pair of shared electrons) adds two electrons to the bonding atoms. Atoms in the nitrate ion will form [tex]8/2 = 4[/tex] chemical bonds.
However, there are only three bonding position available. One of the three positions will see a double bond while each of the other two will see a single bond. However, the double bond can be at any of the three bonding position. There are thus three possible Lewis Structures. See the sketched. Note that the three structures are interconvertible by moving only the electrons but not any atoms. Hence the name resonance structures.
Keep in mind that in reality, the pi electrons from the double bond are delocalized across all three possible bonding positions. All three N-O bonds are of equal length.
Which of the following is a sign a chemical reaction has occurred?
Answer:
2. A piece of metal is placed in water and produces sparks and gas
Explanation:
The production of gas is usually a sign of a chemical reaction. The metal is reacting with the water to form a new substance (the gas).
Incorrect answers and why:
1. Changing colors can be a sign of a chemical reaction, but in this case it's more likely that the colors blended together. (If it was something like two clear liquids combining to form a yellow liquid, then it would be more clear evidence of a chemical reaction)
3. The liquid is boiling
4. The powder dissolved into the liquid
I hope this helps!
The statement that is a sign a chemical reaction has occurred is a piece of metal is placed in water and produces sparks and gas. The correct option is b.
What is a chemical reaction?A chemical reaction is a process in which two or more substances called reactants react to form a different substance or compound, called a product. The metal reacts with water and forms gas and sparks in a chemical reaction.
Although a chemical reaction might cause colors to change, in this case, it's more likely that the hues just mixed. (If it involved the blending of two clear liquids to create a yellow liquid, that would be more convincing proof of a chemical reaction.)
Thus, the correct option is b. A piece of metal is placed in water and produces sparks and gas.
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WILL MARK BRAINLIEST ASAP 20 POINTS
Answer:
elta H = Potential Energy of the Products - Potential Energy of the Reactants.
This would be C-A = delta H
The activation energy would be B-A
This is the energy necessary to start the reaction
Answer:
its the relationship between energies and the coeficcients on the graph.
Explanation:
What do weather and climate have in common?
A. Both affect average ocean temperatures
B. Both are averages measured over a long period of time
C. Both apply to a certain region
D. Both change day to day
Answer:
Both apply to a certain region
Choice C is correct
Explanation:
Weather refers to the atmospheric conditions of a given place over a short period of time, like a day.
On the other hand, Climate refers to the average climatic conditions of a particular region measured over a long period of time.
Both weather and climate apply to a certain region.
What happens to an atom of sulfur (S) if it loses an electron?
Answer:
An atom becomes anion when it gains or loses electrons. The ions that are formed when an atom loses electrons are positively charged because they have more protons in the nucleus than electrons in the electron cloud.
Explanation:
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Answer: Sulfur atom will form a cation on loosing electrons.
Explanation:
There are 3 subatomic particles present in an atom. They are: protons, electrons and neutrons.
Protons carry positive charge, electrons carry negative charge and neutrons does not carry any charge.
Any neutral atom has equal number of protons and electrons.
An ion is formed when atom looses or gain electron.
If an atom gains electrons, it will have more number of electrons than protons. Thus, it will carry negative charge and form an anion.
If an atom looses electrons, it will have less number of electrons than protons. Thus, it will carry positive charge and forms a cation.
It is given that sulfur atom looses an electron. So, this atom will have more number of protons than electrons. Thus, it will form a cation.
Hence, sulfur atom will form a cation on loosing electrons.
what does the capital letter, such as T, represent in a punnett square
Answer: A dominant gene.
Explanation:
Answer:
The dominant form of a gene
Explanation:
The capital letter, such as T, represents the dominant form of a gene in a punnett square.
what is the wavelength of a 3*10^12 Hz infrared wave
A 3*10^20m
B 1* 10^4m
C 3*10^-3m
D 1*10^-4 m
Answer:
D. 1 × 10⁻⁴ m
Explanation:
Electromagnetic waves travel through space with the speed of light which is approximately 3.0 ×10⁻⁸ m/s.
The speed is calculated as follows:
c=λf
Where λ is the wavelength of the wave, f the frequency and c the speed of light.
Thus λ=c/f
=(3×10⁸ m/s) / (3×10¹²Hz)
Wavelength, λ= 1 × 10⁻⁴ m
Answer:
D
Explanation:
A.P.E.X.
which class of compunds has the general formula r-o-r
Answer:
R-O-R is the general formula for Symmetrical Ethers,in which both alkyl groups attached on oxygen are same .
Explanation:
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select all that apply.. which of these elements from the d-block have electron configurations that don't fit the expected pattern? ruthenium,technetium,good,silver
Answer:
These are the ten elements other than chromium and copper in the d-block don’t fit the expected configuration pattern:
niobium (Nb)
molybdenum (Mo)
ruthenium (Ru)
rhodium (Rh)
palladium (Pd)
silver (Ag)
platinum (Pt)
gold (Au)
darmstadtium (Ds)
roentgenium (Rg)
Explanation:
Answer:
ruthenium (Ru)
gold (Au)
silver (Ag)
Explanation:
Can someone help me with 1 to 8 ? I will mark you Brainliest.
Answer:
1. scientist
2. society
3. We can communicate to people across the world in a fraction of a second, our grandparents would've had to pay an extra fee to call anyone outside of the country. We've also made progress in medicine, making diseases like cancer more treatable.
4. Passion, determination, and intelligence.
5. You could ask yourself what factors do the other trees have that the unhealthy tree not have and then create an experiment as to how the variable missing from the unhealthy tree affects plants.
6. Life science was affected by each of these branches.
7. Investigations take a long time because of observations, forming hypothesis, creating an experiment and analyzing the data and then revizing the experiment and the hypothesis. This can take years and cannot be limited to one year.
8. The contributions of these scientists are absolutely still valuable, without these contributions many of the things we know in the modern world wouldn't be known today. Such as the types of organelles and their functions, the periodic table, and the importance of oxygen for human beings.
Explanation:
A salad including lettuce, tomatoes, and onions would be classified as a _________.
Answer:
simple salad
Explanation:
Hi.
Anwers : Vegetable salad.
Achievements.
PLEASE HELP!!!
WILL GIVE BRAINLIEST!!!!
Is this a strong positive linear association or something else?
Answer:
Yes; the graph shows a strong positive linear association.
Explanation:
Majority of the points outline a line of the graph. There are only a few outliers.