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WorksheetsReview Unit 2 Changes in Matter
Total questions: 60
Worksheet time: 1hrs 27mins
Which of the following is a chemical change?
Melting ice
Burning wood
Dissolving sugar in water
Breaking a glass
True or False: Dissolving salt in water is a physical change.
True
False
In a solution of saltwater, what is the solute?
Water
Salt
Both salt and water
Neither salt nor water
Which of the following describes a concentrated solution?
A solution with a small amount of solute
A solution with a large amount of solute
A solution with no solute
A solution with equal amounts of solute and solvent
How does increasing the temperature affect the rate of dissolution of a solid solute in water?
It decreases the rate
It has no effect
It increases the rate
It stops the dissolution
Which factor does NOT affect the rate of dissolution of a solid solute in an aqueous solution?
Temperature
Surface area
Agitation
Color of the solute
True or False: Rusting of iron is a physical change.
True
False
Which of the following is an example of a diluted solution?
A cup of coffee with a lot of sugar
A glass of water with a pinch of salt
A saturated sugar solution
Pure water
What happens to the rate of dissolution when the surface area of a solute is increased?
The rate decreases
The rate remains the same
The rate increases
The solute does not dissolve
Which of the following is a physical change?
Baking a cake
Freezing water
Digesting food
Burning paper
In a lemonade solution, what is the solvent?
Lemon juice
Sugar
Water
Ice
How does stirring affect the rate of dissolution of a solid solute in water?
It decreases the rate
It has no effect
It increases the rate
It stops the dissolution
Water is the (a) in an aqueous solution.
Is this an example of a physical or chemical change?
physical
chemical
Select all of the following images that show a physical change:
broken pencil
broken egg shell
cut paper
rusty nail
color change
When making a solution the solid that is dissolved is called the ___________ and the liquid doing the dissolving is called the __________.
solute, solvent
solvent, solute
acid, base
hydrogen, oxygen
In which cup will the salt dissolve more slowly?
Stirring the solution increases the rate of dissolution (rate of dissolving).
True
False
What combination would dissolve a solid solute the fastest?
high temperature, no stirring
no heat, no stirring
sugar cube, no heat
high temperature, stirring
Jackson is making dinner and is trying to dissolve salt into a pot of water. The salt is dissolving slowly. What should Jackson do to speed up the rate of dissolving?
He should put larger salt particles in the water.
He should heat the water to a higher temperature.
He should completely stop stirring the pot of water.
He should slow down the speed he is stirring the pot.
The smaller the particle size the faster the rate of dissolution (rate of dissolving).
True
False
A solution with high amount of solute
concentrated
saturated
unsaturated
diluted
What kind of mixture is shown in the picture?
Homogeneous
Heterogeneous
What kind of mixture is shown in the picture?
Homogeneous
Heterogeneous
What are the 3 factors that affect rate of dissolution (how fast things dissolve)?
temperature, wind, surface area
temperature, agitation, surface area
emotions, attitude, language
temperature, sound, surface area
What is the definition of temperature?
The measure of hotness or coldness
A homogeneous mixture
stirring
the area of the chemical components used in a reaction
What is the definition of agitation?
The measure of hotness or coldness
A homogeneous mixture
stirring, shaking, mixing
the area of the chemical components used in a reaction
What is the definition of surface area?
The measure of hotness or coldness
A homogeneous mixture
stirring, shaking, mixing
the area of the chemical components used in a reaction
How does temperature affect rate of dissolution?
high (hot) temperature dissolves slowly
high (hot) temperature dissolves faster
low (cold) temperature dissolves faster
How does agitation affect rate of dissolution?
It does not affect it
agitation increases the rate of dissolution (dissolves faster)
agitation decreases the rate of dissolution (dissolves slower)
How does surface area affect rate of dissolution?
It does NOT affect rate of dissolution
higher surface area (more little pieces) dissolves faster
lower surface area (more big pieces) dissolves faster
What is the best definition of rate of dissolution?
the measure of hotness or coldness
stirring
the area of the surface of the solute
the speed at which a solute dissolves in a solvent to form a solution
You can make a solution more concentrated by adding more __________.
solution
Avery is conducting a science experiment. When water is added to a solution it is called a ______________
dilution
concentration
heterogeneous solution
dissociation
Aria is making lemonade. She adds sugar to the water. The sugar is a
solute
solution
science
What is a chemical change?
A change that produces a new substance
A change that alters the shape
A change that alters the state of matter
What is a physical change?
A change that forms a new substance
A change that alters the properties but not chemical makeup
A change that forms a precipitate
changes affecting the form of a chemical substance, but not its chemical identity.
What is a chemical change?
How two chemicals react with one another when combined
A property that we can measure or observe with our 5 senses or other tools
When two chemicals react with one another to form a new substance
When a change occurs but it does not result in the formation of a new substance
A student mixes yellow powder with water. Which observation would prove a CHEMICAL change occurred?
The powder DISSOLVED in the water
The water turned the COLOR yellow
The bag's TEMPERATURE changed
The STATE OF MATTER changed
Which of the following examples provides evidence of a PHYSICAL change?
Wood is burned and releases ash and smoke
Iron rusts over time
When mixed, baking soda and vinegar form gas bubbles
Boiling water bubbles when heated
Which observations prove a chemical change occurred ?
Dissolving and expected color change
Mixing and dissolving
State of matter change and boiling water bubbles
Unexpected color change and temperature change
When mixing milk and vinegar, a white, chunky, solid substance is formed. What has occurred?
Physical change: state of matter
Chemical change: precipitate
Physical change: freezing
Chemical change: rust
You mix two liquids together, bubbles form and the temperature decreases. This is a....
Chemical change
Physical Change
You mix a red liquid and a white solid together. They turn yellow and the temperature increases. This is a...
Chemical change
Physical Change
Digesting food
Chemical
Physical
Apple rotting
Chemical
Physical
Does the following picture represent a chemical or physical change?
Chemical
Physical
Both
