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WorksheetsSolutions and Dissolving
Total questions: 20
Worksheet time: 10mins
When sugar is added to water and stirred, why do the sugar crystals disappear?
The sugar evaporates
The sugar melts into liquid
The sugar forms a solution by mixing evenly with water
The sugar turns into gas
A solution is best described as a mixture that is —
cloudy and uneven
solid only
separated into layers
the same throughout
What does the word homogeneous mean?
Made of solids only
Same composition throughout
Able to be separated easily
Always clear
In a sugar-water solution, which substance is the solute?
Water
The container
Sugar
Heat
In a solution, the solvent is the substance that —
dissolves into another substance
is present in the larger amount
always changes temperature
forms crystals
In salt water, which of the following correctly identifies the solute and solvent?
Salt is the solvent; water is the solute
Salt and water are both solvents
Salt is the solute; water is the solvent
Neither is a solvent
Carbonated soft drinks contain carbon dioxide gas dissolved in water. In this solution, carbon dioxide is the —
solvent
solute
alloy
solid
Air is considered a solution because it —
contains liquids and solids
is only oxygen
is a mixture of gases spread evenly
is always moving
Which gas makes up the largest percentage of air?
Oxygen
Carbon dioxide
Argon
Nitrogen
Sterling silver and brass are examples of —
liquid solutions
gaseous solutions
alloys
pure elements
An alloy is best defined as —
a solution of gases
a mixture of metals with metallic properties
a pure metal
a mixture that cannot conduct electricity
Why must metals be melted to form solid solutions like alloys?
Metals dissolve only in water
Solid particles move too slowly to mix evenly
Metals must be cooled first
Electricity is required
Dissolving of a solid in a liquid happens mainly at the —
center of the solid
bottom of the container
surface of the solid
solvent particles only
Water is especially good at dissolving sugar because water molecules —
are very large
stop moving when heated
are polar and constantly moving
have no electrical charge
What happens first when sugar dissolves in water?
Sugar sinks to the bottom
Water molecules attract sugar molecules
Sugar evaporates
Water freezes
Stirring speeds up dissolving because it —
heats the solution
breaks chemical bonds
moves more solvent into contact with the solute
changes the solute into a liquid
Crushing a sugar cube makes it dissolve faster because it —
changes sugar into a new substance
lowers the temperature
increases surface area
removes the solvent
Why does hot water usually dissolve solids faster than cold water?
Hot water is heavier
Hot water has fewer particles
Higher temperature increases particle motion
Heat breaks the solute into gas
Which combination would result in the fastest dissolving of sugar?
Cold water with no stirring
Hot water, stirring, and crushed sugar
Cold water with whole sugar cubes
Warm water without stirring
Which three factors increase the rate at which a solid dissolves in a liquid?
Color, shape, and mass
Pressure, volume, and density
Stirring, surface area, and temperature
Time, gravity, and light
