What is the ph of a solution with a hydroxyl ion (oh-) concentration of 10-10 m? what is the ph of a solution with a hydroxyl ion (oh-) concentration of 10-10 m? ph 10 ph 12 ph 4 ph 2?
The pH in chemistry has been defined as the "power of hydrogen" that specifies and estimates the acidity and basicity. The pH of the solution with a hydroxyl concentration of 10⁻¹⁰ is 4. Thus, option c is correct.
What is pH?pH has been defined as the "potential of hydrogen" that is used to define the specificity of the acid and alkaline behavior of the solution. It has been the measure of the hydrogen or the hydroxide ions concentration dissociated into the solution.
pH is calculated as:
pH = −log ([H⁺])
Given,
Hydroxide ion concentration = 10⁻¹⁰
The relation between pH and pOH is given as:
pOH = - log [OH⁻]
pH = 14 - pOH
pOH is calculated as:
pOH = - log [OH⁻]
pOH = - log [10⁻¹⁰]
pOH = 10
Substituting values in the formula for pH as:
pH = 14 - pOH
pH = 14 -10
= 4
Therefore, option c. the pH is 4.
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what is the chemical formula of butter
Answer:
C15H8Cl8O2
Explanation:
C15H8Cl8O2
Which best explains how two oxygen atoms, each with six valence electrons,can bond with each other ?
Answer:
The correct answer is "the double covalent bond theory".
Explanation:
Each oxygen atom has 6 valence electrons in the outermost layer. To have greater stability you need to gain two electrons per atom. Therefore two oxygen atoms form a double bond by sharing two electrons each, completing the Lewis octet to acquire greater stability.
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Write the balanced equation for the decomposition of hydrogen peroxide to form water and oxygen.
The balanced chemical equation for the decomposition of hydrogen peroxide into water and oxygen is 2 H2O2 (aq) → 2 H2O (l) + O2 (g).
Explanation:The student has asked for the balanced chemical equation for the decomposition of hydrogen peroxide (H2O2) into water (H2O) and oxygen gas (O2). The reaction can be represented as follows:
2 H2O2 (aq) → 2 H2O (l) + O2 (g)
Here, the hydrogen peroxide molecules are breaking down into water molecules and oxygen gas. The equation is balanced with four hydrogens and four oxygens on both sides; therefore, adhering to the law of conservation of matter.
Which level comes just after atoms in the organization chart of living things? Cells Molecules Organs Tissues
Hello,
100% CorrectThe correct answer is B) Molecules
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(Took the Science test)
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Molecules come just after atoms in the organization chart of living things. Therefore, option B is correct.
What is a molecule?A molecule can be defined as a combination or arrangement of two or more atoms that create the smallest unit into which the structure and chemical properties can be classified and preserved by a pure substance.
A molecule can be homonuclear if it exhibits atoms of a single chemical element such as hydrogen molecule (H₂) or it can be heteronuclear such as water (H₂O).
A molecule exhibits an arrangement of atoms held by the forces of valence. Two atoms of the same element that are chemically combined comprise diatomic molecules.
Heteronuclear diatomic molecules have two combined atoms of different elements such as hydrochloric acid (HCl), Carbon monoxide (CO), etc.
The molecules in living organisms are biomolecules such as carbohydrates, lipids, nucleic acids, proteins,
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How many milliliters of a 5.0 M H2SO4 stock solution would you need to prepare 108.0 mL of 0.45 M H2SO4?
To prepare 108.0 mL of a 0.45 M H2SO4 solution, you would need to measure 9.72 mL of the 5.0 M H2SO4 stock solution.
Explanation:To solve this problem, we can use the concept of dilution. The formula for dilution is C1V1 = C2V2, where C1 and V1 are the concentration and volume of the stock solution, and C2 and V2 are the concentration and volume of the diluted solution.
In this case, the given concentration of the stock solution is 5.0 M and the volume of the stock solution needed is unknown. The desired concentration of the diluted solution is 0.45 M and the volume of the diluted solution is 108.0 mL. Plugging in these values into the dilution formula will give us the volume of the stock solution needed.
Let's solve for V1:
(5.0 M)(V1) = (0.45 M)(108.0 mL)
V1 = (0.45 M)(108.0 mL)/(5.0 M)
V1 = 9.72 mL
Therefore, you would need to measure 9.72 mL of the 5.0 M H2SO4 stock solution to prepare 108.0 mL of 0.45 M H2SO4.
If you eat 3.00 moles of sugar, how many molecules did you consume?
3.00
2.00 x 10^23 molecules
5.00 x 10^ -24 molecules
1.81 x 10^24 molecules
which statement describes the types of change and the chemical properties of the product and reactants
Chemical reactions involve transforming reactants into products, altering their molecular structure and leading to different chemical and physical properties. These transformations are represented by chemical equations, which ensure the conservation of atoms in the reactants and products.
Explanation:Chemical Changes and Chemical Reactions
When discussing the types of change and the chemical properties of the product and reactants, we're looking at chemical reactions. A chemical change transforms one molecular substance into another, altering its molecular structure and creating new substances with different properties. For example, when gasoline burns, it reacts with oxygen to produce heat, light, carbon dioxide, and water vapor. This transformation is represented by a chemical equation, which shows the reactants on one side and the products on the other, linked by an arrow indicating the direction of change.
Reactants are the starting materials in a chemical reaction, and products are the substances formed as a result of the chemical reaction. During this process, chemical bonds in the reactants are broken, and new bonds are formed in the products, leading to a different arrangement of atoms and thus new chemical and physical properties of the substances involved.
Describe two uses of surfactants
Answer:
if its on edge this is what it provides!
- Surfactants are used to help improve gas exchange in the lungs of premature infants.
- Surfactants are used to prevent salad dressings from separating.
- Pulmonary surfactants reduce the surface tension of the gas exchange surfaces in the lungs, allowing gases to diffuse more easily.
- Surfactants help the water molecules and oil molecules in salad dressings interact and mix.
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During which of the following processes is energy absorbed?
i think evaporation
I. boiling
II. condensing
III. evaporating
IV. freezing
V. melting
VI. sublimating
Answer:
I, V, VI
Explanation:
During a state change, e.g solid state to liquid state, energy (absorbed or released) is used to break the bonds between the molecules. In the case of boiling,melting, and sublimation energy is absorbed to break the molecule bonds.
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Which should be done in case of a laboratory accident? Check all that apply.
a)Stay calm.
b)Read directions completely.
c)Do not try to clean up a spill.
d)Follow the teacher’s directions.
e)Wear appropriate lab attire.
f)Leave the area.
Answer : The correct options are, (a), (c), (d) and (f).
Explanation :
There are some safety rules for science lab when we are performing the experiments :
Always wear the lab coat to protect you from chemicals. Always wear the gloves in your hands. Always wear the face mask to protect you from the pungent smell of chemicals. Always wear the glasses to protect the eyes. Before doing some experiment wash all the materials with distilled water.There are some safety rules for science lab in case of a laboratory accident:
Always stay calm at that time. Do not try to clean up a spill. Always follow the directions of the teacher. Leave the area immediately.Hence, the correct options are, (a), (c), (d) and (f).
half life worksheet answer key 1. How long does it take a 100.00g sample of As-81 to decay to 6.25g?
Answer:
132 seconds ( 2 Minutes 12 seconds).
Explanation:
Half life is basically the time it takes for a compound to decay to half of it's original mass.
In this problem, the compound is As. The half life of As-81 is 33 seconds. This means it takes 33 seconds for 100 g of As-81 to decay to 50g. The question however id to find the time it takes for it to decay to 6.25g.
We find how many half life's it would take,
100 --> 50 (First half life)
50 --> 25 (Second half life)
25 --> 12.5 (Third half life)
12.5 --> 6.25 (Fourth half life)
This means the total time is 4 * 33 (Half life) = 132 seconds ( 2 Minutes 12 seconds).
According to Charles Law, if you have a balloon inside a car at noon during a hot summer day the balloon molecules inside will increase in pressure.
A. true
B. false
Final answer:
The claim that a balloon's internal pressure increases due to Charles's Law on a hot day is false; Charles's Law relates gas volume to temperature at constant pressure, meaning the balloon's volume would increase, not pressure.
Explanation:
The statement that balloon molecules inside a balloon will increase in pressure on a hot summer day according to Charles's Law is false. Charles's Law actually states that the volume of a given amount of gas is directly proportional to its temperature on the Kelvin scale when the pressure is held constant. When the temperature inside the car increases, the gas molecules inside the balloon move faster and if the balloon is elastic and can expand, the volume of the gas will increase while the pressure inside the balloon will not necessarily increase if it is free to expand.
Chemoautotrophs use ___ as an energy source and ___ as a carbon source. select one:
a. inorganic compounds: organic compounds
b. light: organic compounds
c. organic compounds: organic compounds
d. light: co2
e. inorganic compounds: co2
autotrophs are organisms that can synthesise organic compounds (e.g.: carbohydrates) from inorganic C compounds (e.g.: CO2)
Phototrophs are those use photons also known as light energy, chemotrophs are those who utilize chemical energy as their source of energy. chemotrophs can either use inorganic or organic molecules as source of energy. from the options given there are 2 answers with CO2, the correct combination is CO2 with inorganic compounds
Therefore chemoautotrophs use inorganic compounds as an energy source and CO2 as a carbon source
Chemistry helps firefighters _____.
Determine which chemicals to use to fight different types of fires.
Which of the following best describes the relationship between products and reactants in an endothermic reaction?
If two covalently bonded atoms are identical, the bond is
A pure covalent bond occurs when two identical atoms share electrons equally, resulting in a nonpolar covalent bond.
Explanation:A pure covalent bond occurs when two covalently bonded atoms are identical. In this type of bond, the electrons are shared equally between the two atoms, resulting in a nonpolar covalent bond. Nonpolar covalent bonds form between two atoms of the same element or between different elements that share electrons equally, such as molecular oxygen (O2).
Pure covalent bonds typically form in situations where the participating atoms are of the same element, such as in the case of molecular oxygen (O2), where two oxygen atoms share electrons equally. Understanding pure covalent bonds is essential in comprehending the nature of chemical bonding and the characteristics of various compounds.
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In the balanced redox reaction: 2 cu(s) + s(s) ® cu2s(s), how many electrons are gained or lost by each copper atom? select one:
a. each copper atom gains two (2) electrons.
b. each copper atom gains one (1) electron.
c. each copper atom loses one (1) electron.
d. each copper atom loses two (2) electrons.
Answer: Option (c) is the correct answer.
Explanation:
The given reaction equation is as follows.
[tex]2Cu(s) + S(s) \rightarrow Cu_{2}S(s)[/tex]
The oxidation-reduction half reactions will be as follows.
Oxidation : [tex]Cu(s) \rightarrow Cu^{+} + 1e^{-}[/tex]
Reduction: [tex]S(s) + 2e^{-} \rightarrow S^{2-} [/tex]
By balancing the above half reactions, oxidation-half reaction will be as follows.
[tex]2Cu(s) \rightarrow 2Cu^{+} + 2e^{-}[/tex]
Whereas reduction-half reaction will remain the same.
Hence, it shows that each copper atom is losing one electron to combine with a sulfur atom.
Therefore, we can conclude that each copper atom loses one (1) electron.
What is desertification
Which of the following has the strongest intermolecular forces?
A) Xe
B) H2
C)CO2
D)CH4
Final answer:
Option C) CO2
Explanation:
All the substances listed are nonpolar, meaning they mainly experience London dispersion forces, which are the weakest intermolecular forces. However, they can vary in strength based on molecular mass and shape. Among the options, CO2 has more polarizable electrons due to its larger size and linear shape compared to Xe, H2, and CH4, thus exhibiting slightly stronger London dispersion forces. However, it's crucial to note that this comparison is subtle because the strengths of dispersion forces can be closely contested among molecules of similar sizes and molar masses. Therefore, CO2 would exhibit the strongest intermolecular forces among the given choices, but the difference might not be highly significant compared to the others, especially CH4.
Which would you expect to experience a greater effective nuclear charge? which would you expect to experience a greater effective nuclear charge? a 2p electron of an atom a 3s electron of a na atom?
Answer:
A 2p electron of a Ne atom
Explanation:
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In glacial erosion by abrasion, a glacier _____.
A. melts entirely before it begins eroding the landscape
B. produces rock flour by grinding the rock surface beneath it
C. loosens and lifts blocks of rock as it flows over the surface
D. plucks up rocks and incorporates them into its ice
During the Glacial erosion by abrasion the glaciers are loaded with other rock fragments as a tool for erosion of the bedrock. These rock fragments are dragged on the bedrock during the forward movement of the glacier and causes the rocks that comes in contact to abrade and the process is known as abrasion.
These abraded mass can also get trapped in the glacier as sub glacial, intra glacial and even super glacial deposit , causing the glacier to increase in mass and hence may flow easily where the glacier flow because of gravity. Abrasion also causes melting of snow because of the frictional heat produced during interaction of rock fragments and country rock.
option D
Answer:
The answer is D
Explanation:
plucks up rocks and incorporates them into its ice.
During the process of photosynthesis, plants use energy from the Sun to transform carbon dioxide from the air into A. minerals and liquid carbon dioxide. B. protein and minerals. C. oxygen gas and molecules of sugar.
Photosynthesis is the process through which plants make their own food.
Special structures called chloroplasts—located inside plant cells—help plants capture light energy from the Sun. The plants then use the energy to build molecules of sugar from carbon dioxide gas and water. Oxygen gas is a waste product of photosynthesis. Plants releases this waste oxygen into the air.
What happens to the shape of a liquid when you pour it into a container?
A chemistry teacher adds 50.0 mL of 1.50 M H2SO4 solution to 200 mL of water. What is the concentration of the final solution? Use .
Answer:
option A
Explanation:
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How many grams of nickel (+2) are required to replace all of the silver when 15.55 grams of AgNO3 are present?
2AgNO3 + Ni2+ = Ni(NO3)2 + 2Ag+
From the reaction, it can be seen that AgNO3 and Ni2+ has following amount of substance relationshep:
n(AgNO3):n(Ni)=2:1
From the relationshep we can determinate requred moles of Ni2+:
n(AgNO3)=m/M= 15.5/169.87=0.09 moles
So, n (Ni)=n(AgNO3)/2=0.045 moles
Finaly needed mass of Ni2+ is:
m(Ni2+)=nxM=0,045x58.7=2.64g
The rate of disappearance of hbr in the gas phase reaction 2hbr (g) → h2 (g) + br2 (g) is 0.190 m s–1 at 150 °c. the rate of appearance of br2 is ________ m s–1
The rate of appearance of Br2 in the gas phase reaction 2HBr(g) → H2(g) + Br2(g) when the rate of disappearance of HBr is 0.190 M/s at 150 °C is 0.095 M/s.
Explanation:To determine the rate of appearance of Br2 in the reaction 2HBr(g) → H2(g) + Br2(g), we use the stoichiometry of the reaction. Given that the rate of disappearance of HBr is 0.190 M/s, and considering that 2 moles of HBr produce 1 mole of Br2, the rate of appearance of Br2 would be half of the rate of HBr's disappearance.
Therefore, the rate of appearance of Br2 is:
Rate of appearance of Br2 = 1/2 × Rate of disappearance of HBrRate of appearance of Br2 = 1/2 × 0.190 M/sRate of appearance of Br2 = 0.095 M/sSo, the rate of appearance of Br2 is 0.095 M/s.
Which of the following statements is true?
A. Stars that appear to move very much are very far from earth
B. The more a star appears to move, the farther is it from earth
C. Stars that do not appear to move are very close to earth
D. The less a star appears to move, the farther it is from earth.
Answer:
The correct answer is option D. The less a star appears to move, the farther it is from earth.
Explanation:
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Let's solve this!
The stars, like the Earth move. We see them still as they are far away, the distance is very large. The stars we see in motion are the ones that are very close.
Then, the further a star is, the quieter we will see it.
After the analysis, we conclude that the correct answer is option D. The less a star appears to move, the farther it is from earth.
When a chemical substance has either lost an electron or gained an oxygen?
What is the rate of the reaction when the initial concentration of no is 0.400 m and that of br2 is 0.245 m ?