# Homogeneous Solution Quiz Questions

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Ana Selby
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Objectives review for final exam.

• 1.

### For the following chemical equation _ Na + _ O2 --> _ Na2O2,   the coefficients that balance the equation are:

• A.

1,1,1

• B.

2,1,1

• C.

2,2,2

• D.

2,1,2

B. 2,1,1
Explanation
The chemical equation provided is Na + O2 --> Na2O2. In order to balance the equation, we need to ensure that the number of atoms on both sides of the equation are equal. By placing a coefficient of 2 in front of Na, we have 2 Na atoms on both sides. By placing a coefficient of 1 in front of O2, we have 2 O atoms on both sides. Finally, by placing a coefficient of 1 in front of Na2O2, we have 2 Na atoms and 2 O atoms on both sides. Therefore, the coefficients that balance the equation are 2, 1, 1.

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• 2.

### Water is referred to as the universal solvent because

• A.

It is found throughout the universe.

• B.

All known substances dissolve in water.

• C.

Many different substances dissolve in water.

• D.

It covers more than half of the Earth's surface.

C. Many different substances dissolve in water.
Explanation
Water is referred to as the universal solvent because it has the ability to dissolve a wide variety of substances. This is due to its unique molecular structure, which allows it to form hydrogen bonds with other molecules. These hydrogen bonds break apart the solute molecules and surround them with water molecules, effectively dissolving them. This property of water makes it an excellent solvent for many substances, including salts, sugars, and acids. Therefore, the correct answer is that many different substances dissolve in water.

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• 3.

### Which of the following is a homogeneous mixture?

• A.

• B.

Gelatin

• C.

Rubbing alcohol

• D.

Orange juice with pulp

C. Rubbing alcohol
Explanation
Rubbing alcohol is a homogeneous mixture because it is a solution of alcohol in water, where the alcohol molecules are evenly distributed throughout the water molecules. This means that the composition and properties of rubbing alcohol are consistent throughout, making it a homogeneous mixture. In contrast, salad dressing, gelatin, and orange juice with pulp are heterogeneous mixtures because they contain visible or distinguishable components that are not evenly distributed.

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• 4.

### A heterogeneous mixture is one that is not

• A.

Uniform throughout.

• B.

Easily mixed together.

• C.

Made of two or more liquids.

• D.

Edible by humans.

A. Uniform throughout.
Explanation
A heterogeneous mixture is one that is not uniform throughout, meaning that its components are not evenly distributed. This means that different parts of the mixture may have different properties or concentrations. In contrast, a homogeneous mixture is one that is uniform throughout, where the components are evenly distributed and the mixture has the same properties and concentrations in all parts.

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• 5.

### Which of the following is an example of a heterogeneous mixture?

• A.

Salt water

• B.

Vinegar

• C.

Sugar solution

• D.

Mayonnaise

D. Mayonnaise
Explanation
Mayonnaise is an example of a heterogeneous mixture because it is made up of two or more substances that are visibly different and do not blend together uniformly. In mayonnaise, the oil and vinegar do not fully mix and can be seen as separate layers or droplets within the mixture.

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• 6.

### The equation identifies the ___________ (starting materials) and _______________(resulting substance),

• A.

Products, reactants

• B.

Reactants, phases

• C.

Reactants, products

• D.

Reactants, formulas

C. Reactants, products
Explanation
The equation identifies the reactants (starting materials) and products (resulting substance).

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• 7.

### In a balanced chemical reaction, the total mass of the products always equals the

• A.

Molar mass of reactants

• B.

Atomic mass of reactants

• C.

Total mass of reactants

• D.

Proportional masses of the reactants

C. Total mass of reactants
Explanation
In a balanced chemical reaction, the total mass of the products always equals the total mass of the reactants. This is because the law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction, only rearranged. Therefore, the total mass of the reactants must be equal to the total mass of the products.

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• 8.

### In the reaction 2H2O ---.>2H2 + O2, if you start with 2 mol of water, how many moles of hydrogen gas are produced?

• A.

1 mol

• B.

2 mol

• C.

3 mol

• D.

4 mol

B. 2 mol
Explanation
In the given reaction, 2 moles of water produce 2 moles of hydrogen gas. This is because the stoichiometric ratio between water and hydrogen gas is 1:1. Therefore, if we start with 2 moles of water, we will produce 2 moles of hydrogen gas.

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• 9.

### A balanced chemical equation shows the proportions of reactants and products necessary for

• A.

The reaction to occur.

• B.

Mass to be conserved

• C.

Energy use to be minimized.

• D.

Electrolysis to occur

B. Mass to be conserved
Explanation
A balanced chemical equation shows the proportions of reactants and products necessary for the reaction to occur. This means that the total mass of the reactants must be equal to the total mass of the products. This principle is known as the law of conservation of mass, which states that mass cannot be created or destroyed in a chemical reaction, only rearranged. Therefore, the correct answer is "mass to be conserved."

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• 10.

### Which of the following is an example of a decomposition reaction?

• A.

Photosynthesis

• B.

Digestion

• C.

Respiration

• D.

Exchange of ions between two compounds

B. Digestion
Explanation
Digestion is an example of a decomposition reaction because it involves the breaking down of complex molecules into simpler substances. In the process of digestion, food is broken down into smaller molecules through the action of enzymes in the digestive system. This breakdown allows for the absorption and utilization of nutrients by the body.

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• 11.

### What kind of reaction occurs when potassium is placed in water?  K + H2O ---- KOH + H2

• A.

Single displacement reaction

• B.

Double displacement reaction

• C.

A decomposition reaction

• D.

Electrolysis

A. Single displacement reaction
Explanation
When potassium is placed in water, it reacts with water molecules to form potassium hydroxide (KOH) and hydrogen gas (H2). This type of reaction, where one element displaces another element in a compound, is called a single displacement reaction. In this case, potassium displaces hydrogen in water to form potassium hydroxide and hydrogen gas.

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• 12.

### A synthesis reaction is a reaction between at least two compounds in which

• A.

One breaks down into at least two products.

• B.

A compound is decomposed by an electric current.

• C.

A compound burns in the presence of oxygen.

• D.

A new, more complex compound is formed.

D. A new, more complex compound is formed.
Explanation
In a synthesis reaction, two or more compounds combine to form a new compound that is more complex than the original compounds. This process involves the rearrangement of atoms and the formation of new chemical bonds. This is different from a decomposition reaction where a compound breaks down into simpler substances. Therefore, the correct answer is that a new, more complex compound is formed in a synthesis reaction.

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• 13.

### What happens in a chemical reaction?

• A.

Atoms are destroyed

• B.

Atoms are created

• C.

Atoms are heated or cooled

• D.

Atoms are rearranged

D. Atoms are rearranged
Explanation
In a chemical reaction, atoms are rearranged. This means that the arrangement of atoms in the reactants is different from the arrangement of atoms in the products. However, no atoms are destroyed or created in a chemical reaction. The total number of atoms remains the same, but their arrangement and bonding change, resulting in the formation of new substances.

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• 14.

### Covalent bonds are formed between

• A.

Iones

• B.

Metal atoms

• C.

Nonmetal atoms

• D.

Compounds

C. Nonmetal atoms
Explanation
Covalent bonds are formed between nonmetal atoms. In a covalent bond, two atoms share electrons in order to achieve a stable electron configuration. Nonmetal atoms have a higher electronegativity, meaning they have a stronger attraction for electrons. This makes them more likely to share electrons with other nonmetal atoms rather than transferring them to form ionic bonds with metal atoms. Therefore, the correct answer is nonmetal atoms.

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• 15.

### An ionic bond is a bond that forms between

• A.

Atoms with opposite charges

• B.

Atoms with neutral charge

• C.

One atom's nucleus and another atom's electrons.

• D.

The electrons of two different atoms

A. Atoms with opposite charges
Explanation
An ionic bond is a bond that forms between atoms with opposite charges. In this type of bond, one atom transfers electrons to another atom, resulting in the formation of positive and negative ions. The attraction between these ions then holds the atoms together, creating a strong bond. This is different from covalent bonds, where atoms share electrons. Therefore, atoms with opposite charges are able to form ionic bonds.

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• 16.

### Each molecule of table sugar, C12H22O11, contains

• A.

0 atoms of carbon

• B.

11 atoms of carbon

• C.

6 atoms of carbon

• D.

12 atoms of carbon

D. 12 atoms of carbon
Explanation
Table sugar, or sucrose (C12H22O11), is composed of 12 carbon atoms. This is because the formula C12H22O11 indicates that there are 12 carbon atoms in each molecule of table sugar.

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• 17.

### A compound differs from a mixture because it

• A.

Always remains frozen even at high temperatures.

• B.

Is formed from two cations.

• C.

Always contains the same elements in the same proportion.

• D.

Can form only in the presence of heat energy.

C. Always contains the same elements in the same proportion.
Explanation
A compound differs from a mixture because it always contains the same elements in the same proportion. This means that the ratio of the different elements in a compound is fixed and does not change. In contrast, a mixture can have varying ratios of different substances.

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• 18.

### An atom's mass number equals the number of

• A.

Protons plus the number of electrons

• B.

Protons plus the number of neutrons

• C.

Protons

• D.

Neutrons

B. Protons plus the number of neutrons
Explanation
The mass number of an atom is the sum of the number of protons and neutrons in its nucleus. This is because protons and neutrons both contribute to the mass of an atom, while electrons have negligible mass compared to protons and neutrons. Therefore, the correct answer is "protons plus the number of neutrons".

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• 19.

### Grinding quartz crystals down to produce sand is an example of a

• A.

Change of state

• B.

Chemical change

• C.

Chemical reaction

• D.

Physical change

D. Physical change
Explanation
Grinding quartz crystals down to produce sand is an example of a physical change because the substance (quartz) is being physically altered in form (from large crystals to small particles) without any change in its chemical composition. The molecules of quartz remain the same, only the arrangement and size of the particles change.

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• 20.

### Lead has a density of 11.3 g/cm3. What is the volume of a block of lead with a mass of 282.5 g?

• A.

2.5cm3.

• B.

25cm3.

• C.

250cm3.

• D.

2500cm3.

B. 25cm3.
Explanation
The density of lead is given as 11.3 g/cm3. Density is defined as mass divided by volume. Therefore, to find the volume of the lead block, we can rearrange the equation to solve for volume. The mass of the lead block is given as 282.5 g. So, we can calculate the volume by dividing the mass by the density: 282.5 g / 11.3 g/cm3 = 25 cm3. Therefore, the volume of the lead block is 25 cm3.

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• Current Version
• Mar 18, 2023
Quiz Edited by
ProProfs Editorial Team
• Dec 15, 2008
Quiz Created by
Ana Selby

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