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Water Molecules And Dissolving
Test Description: Chapter 5-- American chemical society
Instructions: Answer all questions to get your test result.
1) A water molecule has the chemical formula H2O. This means that the water molecule is made up of
A
Two hydrogen atoms and two oxygen atoms
B
Two hydrogen atoms and one oxygen atom
C
Two oxygen atoms and one hydrogen atom
D
Two molecules of water
2) The atoms in a water molecule are held together by covalent bonds. This means that the bonded atoms
A
Lose electrons
B
Switch neutrons
C
Share electrons
D
Lose protons
3) The water molecule is a polar molecule. A water molecule is polar because
A
It is very cold
B
The electrons are shared equally
C
Oxygen has a stronger attraction for electrons than hydrogen
D
Hydrogen atoms have a stronger attraction for electrons than oxygen
4) The water molecule is
A
Slightly negative near the hydrogen atoms and slightly positive near the oxygen atom
B
Slightly negative near the oxygen atom and slightly positive near the hydrogen atoms
C
Slightly positive in all areas of the molecule
D
The same charge in all areas of the molecule
5) Water molecules are attracted to each other because
A
The positive area of one water molecule is attracted to the negative area of another
B
They are all positively charged
C
Each water molecule has the same number of protons as electrons
D
All water molecules are neutral
6) A paper clip can stay on the surface of a sample of water because of water’s strong surface tension. Water’s surface tension is mostly a result of
A
The impurities in the water
B
The motion of water molecules
C
The attraction of water molecules
D
Water’s temperature
7) Sodium chloride is made up of sodium ions and chloride ions which bond together in a salt crystal because
A
They are the same size
B
They both have protons and electrons
C
One is positive and one is negative so they attract
D
They have the same charge
8) Water is able to dissolve sodium chloride because
A
Water molecules and sodium chloride are covalently bonded
B
The oxygen in the water molecules reacts with the sodium and chloride ions
C
The polar areas of water molecules attract the oppositely charged ions of sodium chloride
D
The shape of the water molecules pushes the sodium and chloride ions apart
9) Water cannot dissolve all substances that are made from ionic bonds. This is probably because
A
Some water molecules are not as strong as others
B
Some ionic bonds are too strong for the attractions of water molecules to pull them apart
C
Water needs to be stirred to dissolve all ionic substances
D
Water needs to be heated to dissolve all ionic substances
10) The chemical formula for sucrose (sugar) is C6H12O6. In some parts of the sucrose molecule, oxygen is covalently bonded to hydrogen. This makes the sucrose molecule
A
Bonded like salt
B
Smaller than a water molecule
C
Act like a liquid
D
A polar molecule
11) Sucrose dissolves well in water because
A
Polar water molecules attract the carbon atoms in the sucrose molecules
B
Water is usually warm
C
Polar water molecules attract the opposite polar areas of the sucrose molecules
D
Sucrose is used to make sweet beverages
12) When sucrose dissolves in water
A
Each sucrose molecule breaks in half
B
The water molecules cause the sucrose molecules to separate from one another
C
The water molecules covalently bond to the sucrose molecules
D
The sucrose molecules break apart into individual atoms
13) Alcohol molecules are not as polar as water molecules. If you mixed sucrose in alcohol you might expect the sucrose
A
To increase in size
B
To dissolve better in alcohol than in water
C
To dissolve equally well in alcohol and in water
D
To dissolve in alcohol not as well as in water
14) Dissolving often involves a solid dissolved in a liquid. In this type of dissolving
A
The solid is the solvent
B
The liquid is the solute
C
The solid is both the solvent and the solute
D
The solid is the solute and the liquid is the solvent
15) Sugar is more soluble at higher temperatures. This is mainly because at higher temperatures
A
Water molecules actually come apart into separate atoms and react with the sugar
B
Sugar and water molecules move faster and their interactions make the sugar molecules separate from one another
C
Water molecules spread out more, making more room for the sugar molecules
D
Sugar and water molecules move slower and their interactions make the sugar molecules stay together longer
16) Water is not a good dissolver of oil mainly because
A
Oil is thicker than water
B
Oil is also a liquid
C
Oil molecules are non-polar
D
Oil is colder than water
17) Carbon dioxide gas dissolves pretty well in water because
A
The bond between the carbon and oxygen in the carbon dioxide is polar
B
The molecules of a gas are far apart compared to the molecules of a liquid
C
Water molecules are non-polar
D
Water can dissolve anything with carbon
18) The amount of gas that can dissolve in water
A
Increases as the temperature of the water increases
B
Does not change when the temperature of the water changes
C
Does not depend on the type of gas
D
Increases as the temperature of the water decreases
19) When certain substances dissolve, the solution gets warmer. This type of dissolving process is exothermic. In exothermic dissolving
A
A gas is always produced
B
The temperature does not change
C
More energy is released when water molecules bond to the solute than is used to pull the solute apart.
D
More energy is used to pull the solute apart than is released when water molecules bond to the solute.
20) When certain substances dissolve, the solution gets colder. This type of dissolving process is endothermic. In endothermic dissolving
A
More energy is released when water molecules bond to the solute than is used to pull the solute apart.
B
More energy is used to pull the solute apart than is released when water molecules bond to the solute.
C
Water molecules break apart into atoms
D
The temperature does not change
*select an answer for all questions
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