Answer:
Depending on the definition of "standard" conditions, the volume of O₂ required here will be either
43.1 L if the STP volume is 22.4 L/mol, or43.7 L if the STP volume is 22.7 L/mol.Explanation:
Relative atomic mass data from a modern periodic table:
Fe: 55.845.How many moles of iron Fe in that 35.8 gram of iron metal?
[tex]M(\mathrm{Fe}) = \rm 55.845\; g\cdot mol^{-1}[/tex].
[tex]\displaystyle n = \frac{m}{M} = \rm \frac{35.8\; g}{55.845\; g\cdot mol^{-1}} = 0.641060\; mol[/tex].
How many moles of oxygen gas will be required?
Consider the ratio between the coefficient of Fe and that of [tex]\mathrm{O_2}[/tex] in the equation:
[tex]\displaystyle \frac{n(\mathrm{O_2})}{n(\mathrm{Fe})} = \frac{3}{1} = 3[/tex].
As a result,
[tex]\displaystyle n(\mathrm{O_2}) = n(\mathrm{Fe}) \cdot \frac{n(\mathrm{O_2})}{n(\mathrm{Fe})} = \rm 0.641060\; mol \times 3 = 1.92318\; mol[/tex].
What's the volume of that [tex]\rm 1.92318\; mol[/tex] of oxygen gas under STP?
One mole of an ideal gas occupies a volume 22.4 Liters under STP (or 22.7 liters in certain textbooks.) The volume of an ideal gas is directly related to the number of moles of particles in this gas. Assume that oxygen acts like an ideal gas under STP. As a result, 1.92318 moles of oxygen will occupy a volume of either
[tex]\rm 1.92318\; mol \times 22.4\; L\cdot mol^{-1} = 43.1\; L[/tex] or
[tex]\rm 1.92318\; mol \times 22.7\; L\cdot mol^{-1} = 43.7\; L[/tex].
an element has atomic number 10 and an atomic number mass of 20. How mamy neutrons are in the atom of this element?
Answer:
10
Explanation:
The atomic mass = 20
The atomic number = 10
The number of neutrons = mass - number = 20 - 10 = 10
This formula is always true. There are no exceptions.
Which body system is NOT a part of the excretory system?
A.)circulatory system
B.)digestive system
C.)respiratory system
D.)integumentary system
I would go with option D.integumentary system
Which item is an alloy?
a bowl of salsa
a bottle of salad dressing
a metal cooking pot
a cake made with gelatin
A metal cooking pot is an alloy.
Hence, Option (C) is correct answer.
What is an Alloy ?An alloy is a mixture of metals and other elements. It is a substance which has metallic properties.
Examples: Steel is an alloy of iron and carbon. Bronze is an alloy of copper and tin. Brass is an alloy of copper.
A metal cooking pot are made from stainless steel, cast iron, copper or glass.
Thus, from the above conclusion we can say that A metal cooking pot is an alloy.
Hence, Option (C) is correct answer.
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What volume of a 0.0606 M solution of strontium bromide is needed to obtain 0.340 mol of the compound?
Question 42 options:
A)5.61 L
B) 3.4 L
C) 600 mL
D) 1 L
E) 178 mL
C=n/V
V=n/C=0.34/0.0606=5.61L
What is insulin's structure?
a.quaternary
b.secondary
c.primary
d.tertiary
Insulin has a complex structure that involves primary, secondary, tertiary, and quaternary levels, with its three-dimensional tertiary structure being essential for its biological function.
Explanation:The structure of insulin can be described in terms of primary, secondary, tertiary, and quaternary levels. The primary structure refers to its amino acid sequence. Insulin exhibits a secondary structure through regions of alpha-helices and beta-sheets. The tertiary structure of insulin is its unique three-dimensional shape resulting from the folding of the protein, and is essential for its biological function. Finally, insulin may also exhibit a quaternary structure when two insulin monomers (A and B chains) come together, stabilized by disulfide bonds and other interactions, as seen in its storage form within the body.
7. In the cycle, a virus integrates its DNA into the host's DNA, and its DNA is replicated when the host
DNA is replicated.
A. infectious
B. retroviral
C. lysogenic
D.lytic
Answer:
Its lysogenic cycle if a virus integrates its DNA into host cell.
Explanation:
Bacteriophages are the viruses which infect bacteria. Viruses are obligatory parasites which need host for their survival. Viruses which infect bacteria can either take up the lytic cycle or lysogenic cycle. Lytic as the name suggests involves the lysis of host bacterial cell after the replication of virus. Once the bacterial cell is lysed and the virions are released they invade another host bacterial cell. In the other case i.e. lysogenic cycle, the bacteriophage after infecting the host bacterial cell integrates its genome into the host cell genome. At this stage we call it as prophage. The viral genome gets replicated with the host cell machinery but does not produces the viral protein and remains dormant with in the host cell. The integrated genome of virus is passed on to the daughter cells as the cell division occurs. Once the bacterial host cell condition becomes progressively worse, the reproductive cycle of virus begins resulting in the lysis of host cell.
The trend for ionization energy is a general increase from left to right across a period. However, magnesium (Mg) is found to have a higher first ionization energy value than aluminum (Al). Explain this exception to the general trend in terms of electron arrangements and attraction/repulsion
Answer:
Explanation:
The noticeable exception in the trends of ionization energy of Mg and Al can best be explained using the arrangements of the electrons in the sub-levels.
Mg with 12 electrons has an electronic configuration of 2,8,2 = 1S²2S²2P⁶3S²
Al with 13 electrons has an electronic configuration of 2,8,3 = 1S²2S²2P⁶3S²3P¹
Lets take a little peep into what ionization energy is.
Ionization energy is a measure of the readiness of an atom to lose electron. The amount of energy needed to remove an electron is called the ionization energy. In this regard, the first ionization energy is the energy need to remove the valence or the most loosely held electron in an atom.
The magnitude of the ionization energy depends on a number of factors. The most important to our discuss here are:
Nuclear chargeAtomic radiusSublevel accomodating the electron to be removedSpecial stability of filled or half-filled sublevels.The arrangement of electrons in Mg confers a special stability on it because of the filled sublevel.
The maximum number of electrons in each sub-levels are:
s-orbital = 2 electrons
p- orbital = 6 electrons
d - orbital = 10 electrons
f - orbital = 14 electrons
In Mg, 1S²2S²2P⁶3S² , the outermost s-sublevel have 2 electrons and s-orbital can accomodate a maximum of 2 electrons in this subshell. This makes the arrangement stable.
For Al, 1S²2S²2P⁶3S²3P¹, the outermost p-subshell houses just one electron but it can accommodate a maximum of 6 electrons. This arrangement is unstable.
Due to this electron arrangements, Mg would have a very stable configuration and a greater first ionization energy compared to Al.
If the price of gasoline is $3.85 per US gallon, what is the cost per liter? (1 L =1.06 qt)
If the price of gasoline is 3.85 dollars per US gallon, the price per litre will be 0.844 dollars. Because 1 gallon = 4.56 litres.
What are volume units?Volume is used for the measurement of capacity. Thus the unit for measuring volume is basically a unit for measuring the capacity or the extent of space in an object. A unit is used to indicate the volume of goods or liquids. It should be kept in mind that mass and volume are two different physical quantities.
The SI Unit for volume is measured in cubic metres or m^3. Here the three-dimensional use of the base unit of length is used which is metres.
1 m^3 = 1 m • 1 m • 1 m.
The metric unit for volume is the litre and is widely used. Also, there are standard metric prefixes which are used for highlighting large or small volume measures. These are millilitre (ml) which is also used as a unit for measuring volume.
Few other units are used to depict the volume. These are the British system of measurements like barrels, drams, gills, bushels, and pecks. In the British system, more standard units used are the cubic inch or cubic foot and the gallon.
Therefore, If the price of gasoline is 3.85 dollars per US gallon, the price per litre will be 0.844 dollars. Because 1 gallon = 4.56 litres.
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Final answer:
To convert the price of gasoline from $3.85 per US gallon to the cost per liter, divide $3.85 by 3.78541, which results in approximately $1.017 per liter.
Explanation:
If the price of gasoline is $3.85 per US gallon, we need to convert this to the cost per liter. Since 1 US gallon is equivalent to 3.78541 liters, we divide $3.85 by 3.78541 to get the price per liter.
The calculation is as follows:
$3.85 per gallon ÷ 3.78541 liters per gallon = approximately $1.017 per liter.
Therefore, the cost of gasoline is roughly $1.017 per liter.
A particle that the nucleus is an atom is called a(n)
Answer:
Eukaryotic cells
Explanation:
Prokaryotic cells do NOT have nuclei.
I hope this helps, and as always, I am joyous to assist anyone at any time.
A piece of copper has a temperature of 75.6 0C. When the metal is placed in 100.0 grams of water at 19.1 0C, the temperature rises by 5.5 0C. What is the mass of the metal?
The mass of the copper is approximately 1085.55 g.
To solve this problem, we can use the principle of heat transfer, which states that the heat lost by the metal (copper) is equal to the heat gained by the water.
The heat gained or lost by a substance can be calculated using the formula:
[tex]\[ Q = mc\Delta T \][/tex]
Where:
- Q is the heat gained or lost (in joules)
- m is the mass of the substance (in grams)
- c is the specific heat capacity of the substance (in J/g°C)
- [tex]\( \Delta T \)[/tex] is the change in temperature (in °C)
For copper, the specific heat capacity is approximately [tex]\( 0.385 \, J/g ^\circ C} \)[/tex], and for water, it's 4.18 J/g°C.
Let's denote:
- [tex]\( m_c \)[/tex] as the mass of the copper
- [tex]\( m_w \)[/tex] as the mass of the water
- [tex]\( \Delta T_c \)[/tex] as the change in temperature of the copper
- [tex]\( \Delta T_w \)[/tex] as the change in temperature of the water
Given:
- [tex]\( \Delta T_c = \Delta T_w = 5.5 \, ^\circ C} \)[/tex]
- [tex]\( c_c = 0.385 \, J/g^\circ C} \)[/tex] (specific heat capacity of copper)
- [tex]\( c_w = 4.18 \, J/g^\circ C} \)[/tex] (specific heat capacity of water)
- [tex]\( T_{c,i} = 75.6 \, ^\circ C} \)[/tex] (initial temperature of copper)
- [tex]\( T_{w,i} = 19.1 \, ^\circ C} \)[/tex] (initial temperature of water)
We can set up the equation:
[tex]\[ m_c \cdot c_c \cdot \Delta T_c = m_w \cdot c_w \cdot \Delta T_w \][/tex]
Solving for [tex]\( m_c \)[/tex]:
[tex]\[ m_c = \frac{m_w \cdot c_w \cdot \Delta T_w}{c_c \cdot \Delta T_c} \][/tex]
Substituting the given values:
[tex]\[ m_c = \frac{100.0 \, \text{g} \cdot 4.18 \, {J/g ^\circ C} \cdot 5.5 \, {^\circ C}}{0.385 \, {J/g^\circ C} \cdot 5.5 \, {^\circ C}} \][/tex]
[tex]\[ m_c = \frac{2299 \, \text{J}}{2.1175 \, \text{J}} \][/tex]
[tex]\[ m_c \approx 1085.55 \, \text{g} \][/tex]
So, the mass of the copper is approximately 1085.55 g.
what volume of 0.500 mol/L hydrochloric acid, HCI (aq) is required to react completely with 1.00 g of aluminum hydroxide, AI(OH)3 (s)?
Please help
To find the volume of hydrochloric acid (HCI) required to react completely with aluminum hydroxide (AI(OH)3), use the balanced chemical equation and stoichiometry. The equation is AI(OH)3 (s) + 3HCl (aq) -> AICl3 (aq) + 3H2O (l). Convert the mass of AI(OH)3 to moles, then use the mole ratio to find the volume of HCl.
Explanation:To find the volume of hydrochloric acid (HCI) required to react completely with aluminum hydroxide (AI(OH)3), we need to use the balanced chemical equation for the reaction and the stoichiometry of the reaction.
The balanced chemical equation is: AI(OH)3 (s) + 3HCl (aq) -> AICl3 (aq) + 3H2O (l)
From the equation, we can see that 1 mole of AI(OH)3 reacts with 3 moles of HCl. Given that the concentration of HCl is 0.500 mol/L, we can convert the mass of AI(OH)3 to moles, then use the mole ratio to find the volume of HCl:
Calculate the moles of AI(OH)3: 1.00 g AI(OH)3 * (1 mol AI(OH)3 / molar mass AI(OH)3)Use the mole ratio to find the moles of HCl: moles AI(OH)3 * (3 moles HCl / 1 mole AI(OH)3)Convert moles of HCl to volume using the concentration: moles HCl * (1 L / 0.500 mol)Plug in the values above to calculate the volume of HCl required.
Which of the following is not matter? a) Blood b) Humidity c) Electron d) Moon rock
Answer:
Humidity is the answer.
The percent yield of a chemical reaction is
valuable to many industries. Low percent yields
can result in the loss of large amounts of money..
Which of the following would likely increase the
percent yield of a reaction?
Check all that apply.
using accurate measurements
using pure chemicals
performing the reaction under the most ideal
conditions
adding water to the experiment
DONE
o
Photo by Luigi Chiesa
Answer:
The correct choices are:
using accurate measurementsusing pure chemicalsperforming the reaction under the most ideal conditionsExplanation:
The theoretical yield is the maximum amount of product that could be obtained by the chemical reaction, from a given amount of reactants. You calculate the theoretical yield using the stoichiometry coefficients of the balanced chemical equation.
The percent yield is the ratio of the actual yield (the actual amount obtained) of a product to the theoretical yield for the same product, expressed as a percentage (i.e. multiplied by 100).
percent yield = actual yield × 100 / theoretical yieldAs the actual yield decrease (the numerator of the ratio), the percent yield decrease.
To increase the percent yield it is important:
using accurate measurementsusing pure chemicalsperforming the reaction under the most ideal conditionsUsing accurate measurements: if you do not add the correct amounts of each reactant, then the product obtained will not be what you can predict from the theoretical calculations and you will be wasteing one or other reactant, without reaching the maximum yield possible.
Using pure chemicals: if the chemicals are not pure, the amount of actual reactants will be lower than they should be, leading to a lower actual yield.
Performing the reaction under the most ideal conditions: the actual rate of reactions depend on the conditions: temperature and pressure are the most commons. Since, temperature and pressure may change that rate of reactions, you should find and use the most ideal conditions to get the greatest actual yield.
Adding water, can just dilute the reactants and would decrease the rate of reaction, which would not be helpful to increase the yield.
Answer is using accurate measurements
using pure chemicals
performing the reaction under the most ideal conditions
what is the predictided change in the boiling point of water when 1.5 g of barium chloride (BaCl2) is dissolved in 1.5 Kg of water
Answer:
0.0074 °C.
Explanation:
Adding solute (BaCl₂) to water causes elevation of boiling water of water (collegative properties).We can predict the change in the boiling point (ΔTb) of water using the relation:ΔTb = i.Kb.m,
where, ΔTb is the elevation in boiling water.
i is van 't Hoff factor, The van 't Hoff factor is the ratio between the actual concentration of particles produced when the substance is dissolved and the concentration of a substance as calculated from its mass. For most non-electrolytes dissolved in water, the van 't Hoff factor is essentially 1.
i for BaCl₂ = 3/1 = 3.
Kb is the molal elevation constant of water (Kb = 0.512 °C/m).
m is the molality of the solution.
molality (m) is the no. of moles of solute dissolved in 1.0 kg of solvent.m = (no. of moles of BaCl₂)/(mass of water (kg)) = (mass/molar mass of BaCl₂)/(mass of water (kg)) = (1.5 g/208.23 g/mol)/(1.5 kg) = 0.0048 m.
∴ ΔTb = i.Kb.m = (3)(0.512 °C/m)(0.0048 m) = 0.0074 °C.
Explain the relationship between forward and backward reactions in equilibrium, and predict how changing the amount of a reactant (creating a tension) will affect that relationship.
Answer:
1- Equilibrium determines the rate of reactants and products at the same time.
General expression for equilibrium:
Reactants⇌ Products
2- At equilibrium, all the reactants and products are constant.
3- At equilibrium forward and reverse reaction does not stop, in fact, it continues at all times.
4- When the concentrations of reactants and products become equal dynamic equilibrium is obtained.
For example:
A + B ⇌ C + D
In this reaction, if the concentration of reactant A has increased the equilibrium will shift to the right to form more products.
If the concentration of reactant A has decreased the equilibrium will shift to the left in the backward direction to form reactants.
Answer:At equilibrium, the forward and backward reaction rate is the same.
Explanation:The equilibrium counteracts any change in the condition of the reactant or product. The le'chatalier principle highlights three main factors that affect the state of equilibrium. The three factors are: amount of moles, concentration and pressure.If the amount of reactant is increased, the equilibrium will shift to the right in order to create a balance between the forward and backward reaction and vice versa.
How many atoms of fluorine are in each molecule of disulfur decafluoride?
10
5
2
15
Answer:
10
Explanation:
You can tell with the name of the molecule. Just remember that the prefix will tell you how many.
di = 2
deca = 10
The name of the molecule is
disulfur decaflouride
This means that there are 2 sulfur atoms and 10 flourine atoms.
To eliminate the other choices:
penta = 5
pentadeca = 15
The student repeated the experiment using a higher concentration of acid. The same volume of acid and the same mass of magnesium ribbon were used. What volume of hydrogen gas would have been produced after 60 seconds?
Answer:
53 cm³
Explanation:
When the student used dilute sulfuric acid, the reaction was complete after 60 s, because no more hydrogen was formed in the next 10 s.
The reaction would go faster if the student used a more concentrated acid, but 53 cm³ of hydrogen is the most that would form.
Which of the following is an indication that a substance has undergone a chemical change?
A.
No new product has been formed.
B.
The color of the substance has not changed.
C.
The original constitute has not changed.
D.
The molecular structure has changed.
A change in the molecular structure is an indication that a substance has undergone a chemical change. Hence, option D is correct.
What is molecular structure?Molecular geometry, also known as the molecular structure, is the three-dimensional structure or arrangement of atoms in a molecule.
Some signs of a chemical change are a change in colour and the formation of bubbles.
The five conditions of chemical change: colour change, formation of a precipitate, formation of a gas, odour change, temperature change or change in molecular structure.
Hence, option D is correct.
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A stable atom that has a large nucleus most likely contains
1. more neutrons than protons.
2.more protons than neutrons.
3.equal numbers of protons and neutrons.
4.changing numbers of protons and neutrons.
Answer:
3.equal numbers of protons and neutrons.
Explanation:
A stable atom with a large nucleus would contain equal number of protons and neutrons. When the number of protons and neutrons in the nucleus are equal, an atom would attain stability.
Unstable atoms have either the number of protons or neutrons greater. In order for such atoms to attain stability, they give off the excess protons or neutrons. When atoms gives off excess protons or neutrons, they are said to be radioactive.
Answer:
More neutrons than protons
Explanation:
The complete combustion of 1 mole of glucose in a living cell releases _____ the complete combustion of 1 mole of glucose by fire.
Answer:
The same amount of energy as
Explanation:
The complete combustion of 1 mole of glucose in a living cell releases the same amount of energy as the complete combustion of 1 mole of glucose by fire.
The same amount of glucose contains a fixed amount of energy
Answer: The same amount of energy
Explanation: Glucose the primary source of energy for all the living organism. In order to sustain a life, organisms need to use energy for all the vital processes of the body.
Combustion of glucose inside the body or combustion of glucose outside in the environment with the help of fire will generate the same amount of energy.
PLEASE HELP !!!!!!!!!
what is the solute and the solution for a solvent of 44.8g and percent of 4.8
Answer:
The solute is 2.26 g and the solution is 47.1 gExplanation:
1) Percent formula: % = (mass of solue / mass of solution)×100
mass of solute = xmass of solvent = 44.8 gmass of solution = mass of solute + mass of solvent = x + 44.8Substitue the values in the percent formula:
4.8 = 100 x / (x + 44.8 g) 0.048 = x / (x + 44.8)0.048 (x + 44.8) = xx - 0.048x = 2.15x = 2.15 / ( 1 - 0.048) x = 2.26Mass of solute = 2.26 g ← answer
2) Mass of solution = mass of solute + mass of solvent
Mass of solution = 2.26g + 44.8g = 47.1 g ← answerAnswer:
[tex]\boxed{\text{Mass of solute = 2.26 g; mass of solution = 47.1 g}}[/tex]
Explanation:
[tex]\text{Mass percent} = \dfrac{\text{mass of solute }}{\text{mass of solute + mass of solvent}} \times 100 \, \%[/tex]
1. Calculate the mass of solute
Let x = mass of solute. Then
[tex]\begin{array}{rcl}4.8 & = & \dfrac{x}{x + 44.8} \times 100\\\\4.8(x + 44.8) & = & 100x\\4.8x + 215 & = & 100x\\215 & = & 95.2x\\\\x & = & \dfrac{215}{95.2}\\\\x & = & \textbf{2.26 g}\\\end{array}[/tex]
2. Calculate the mass of solution
Mass of solution = mass of solute + mass of solvent = (2.26 + 44.8) g
= 47.1 g
[tex]\boxed{\textbf{Mass of solute = 2.26 g; mass of solution = 47.1 g}}[/tex]
Certain types of organisms such as fireflies and anglerfish can produce light
through chemical reactions in a process called bioluminescence.
What kind of chemical reactions occur during bioluminescence?
O A) exothermic
OB) endothermic
OC) recomposition
OD) decomposition
Answer:
B
Explanation:
Four statements about the development of the atomic model are shown below.
A: Electrons have wavelike properties.
B: Atoms have small, negatively charged particles.
C. The center of an atom is a small, dense nucleus.
D: Atoms are hard, indivisible spheres.
Which order of statements represents the historical development of the atomic model?
C-D-A-B
C-D-B-A
D— В-А — С
D-B-C-A
Answer:
D-B-C-A
Explanation:
D: Atoms are hard, indivisible spheres — John Dalton: Atomic theory (1803)
B: Atoms have small, negatively charged particles — J. J. Thomson: cathode rays (1897)
C. The center of an atom is a small, dense nucleus — Lord Rutherford: gold foil experiment (1909)
A: Electrons have wavelike properties — Niels Bohr: Bohr model (1913)
The development of the idea of atoms passed through various stages.
The history of the development of the atomic theory passed through several stages. Each stage in the development of atomic theory was backed by empirical evidence. The theory was jettisoned only when more compelling evidence suggests that the current model is inaccurate.
The order of development of atomic theory is shown below;
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Blood serum is typically about 0.0044 M in K+ (aq). Calculate the mass of the potassium ions in 4,459. mL of blood serum. The molar mass of potassium is 39.10 g/mol
Answer:
0.767 g.
Explanation:
Molarity (M) is defined as the no. of moles of solute dissolved in a 1.0 L of the solution.
M = (no. of moles of K⁺)/(Volume of the solution (L).
∵ no. of moles of K⁺ = (mass/molar mass) of K⁺.
∴ M = (mass/molar mass) of K⁺/(Volume of the solution (L).
M = 0.0044 M.
Volume of the solution = 4459.0 mL = 4.459 L.
mass of K⁺ = ??? g.
molar mass of K⁺ = 39.01 g/mol.
∴ mass of K⁺ = (M)((molar mass of K⁺)(volume of the solution (L)) = (0.0044 M)(39.10 g/mol)(4.459 L) = 0.767 g.
Given the balanced equation representing a reaction:
HSO4- (aq) + H20() → H30+(aq) + SO42-(aq)
According to one acid-base theory, the H2O(2) molecules act as
a base because they accept H+ ions
a base because they donate H+ ions
an acid because they accept H+ ions
an acid because they donate H+ ions
Submit Answer
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Answer:
it is a base because they accept H+ ions
Explanation:
The correct answer is a base because they accept H+ ions.
According to one acid-base theory, what is the base?The base is a substance that can accept H+ ions. A proton can be donated by a conjugated acid and the base reforms.[tex]OH^{-} + H^{+}[/tex]⇄ [tex]H_{2}O[/tex]
According to one acid-base theory, what is the example of the base?Acetic acid provides a proton and functions as an acid in this process, whereas the water molecule (base) takes a proton.
[tex]CH_{3}CO_{2}H + H_{2}O[/tex] ⇄[tex]CH_{3}CO_{2} ^{-} + H_{3}O^{+}[/tex]
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What is the hydrogen ion and hydroxide ion concentration for a pOH of 3.557? Is the solution an acid or a base?
Answer:
Hydrogen ion concentration is 2.773E-4Mole per DM3
Hydroxide ion concentration is 4.093E-11
It is an acid
Explanation:
PH(H3O)=-LogH3O
PH=3.557
H3O=antilog of -3.557
antilog of -3.557=antilog (0.443 -4)
antilog0.443 ×antilog -4=2.773E-4mole per DM3.
(H3O)(OH)=10^-14
H30=2.773×10^-14
OH= 1.00E-14/2.773E-4
=4.093E-11
it is an acid since the concentration of hydrogen ion is more than the hydroxide ion
Answer:
[tex]3.606\times 10^{-11} M[/tex] is the hydrogen ion concentration.
0.0002773 M is the hydroxide ion concentration.
The solution has pH value more than 7 which means that it is base.
Explanation:
The pH of the solution is defined as negative logarithm of hydrogen ions concentration in a solution. Lower the value of pH more acidic will the solution.
Mathematically written as:
[tex]pH=-\log[H^+][/tex]
The pOH of the solution is defined as negative logarithm of hydroxide ions concentration in a solution. Lower the value of pOH more alkaline will the solution.
Mathematically written as:
[tex]pOH=-\log[OH^-][/tex]
The sum of ph and pOH is equal to 14.
pH + pOH = 14
We have:
Solution with pOH = 3.557
The pH of the solution = 14 - pOH = 10.443
[tex]pH=-\log[H^+][/tex]
[tex]10.443=-\log[H^+][/tex]
[tex][H^+]=3.606\times 10^{-11} M[/tex]
[tex]3.606\times 10^{-11} M[/tex] is the hydrogen ion concentration.
[tex]pOH=-\log[OH^-][/tex]
[tex]3.557=-\log[OH^-][/tex]
[tex][OH^-]=0.0002773 M[/tex]
0.0002773 M is the hydroxide ion concentration.
The solution has pH value more than 7 which means that it is base.
Which metric unit of length or distance is most com-
parable in scale to each of the following English sys-
tem units for making measurements?
a. an inch
b. a yard
c. a mile
Which of these best describes an ionic bond?
Answer:
chemical bonding that involves the electrostatic attraction between oppositely charged ions, and is the primary interaction occurring in ionic compounds
Explanation:
What is the empirical formula of a compound that is made of 3.80g of phosphorus and 0.371g of hydrogen?
You start by diving each quantity given by the atomic wight of each element:
Phosphorus (P) [tex]\frac{3.8}{31} =0.123[/tex]
Hydrogen (H) [tex]\frac{0.371}{1} =0.371[/tex]
Then you divide by the lowest number:
[tex]\frac{0.123}{0.123} = 1[/tex] for phosphorus
[tex]\frac{0.371}{0.123} = 3[/tex] for hydrogen
So the empirical formula will be:
[tex]PH_{3}[/tex]
how can liquids be seperated by density
A the liquids are absorbed onto a paper
B the liquids are turned into seperate vapors
C the liquids are collected as they evaporate
D the liquids are allowed to seperate into layers
Answer:
D the liquids are allowed to seperate into layers
D. The liquids are allowed to separate into layers.
Explanation:Density refers to the weight of the substance. The substance which is light in weight remains at the top of the substance which is heavy or with more density. This principle is used for separation of liquid based on their density.
In the process, the liquid sample composed of various liquids of varying density is poured in a separating funnel. The setup is left as it is without disturbance for considerable period of time. Based upon the weight of the liquid it forms a layer in which liquid with high density settles at the bottom, whereas liquid with less density remain at the top.