WorksheetsMS-PS1-2 Assessment
Total questions: 50
Worksheet time: 28mins
Which statement best distinguishes a physical change from a chemical change?
A physical change alters the chemical formula; a chemical change keeps it the same.
A physical change changes an object's mass; a chemical change changes its volume.
A physical change changes the appearance without changing the chemical formula; a chemical change forms new substances with different formulas.
Both physical and chemical changes form new substances.
During a physical change, what happens to the chemical formula of a substance?
It stays the same.
It becomes longer.
It changes to a completely different formula.
It breaks into elements only.
During a chemical change, what happens to the chemical formula of a substance?
It remains unchanged.
It changes to represent new substances formed.
It gains more atoms but stays the same substance.
It disappears.
A piece of paper burns to ash and releases smoke. Which type of change is this, and what evidence supports your answer?
Physical change; the paper is still paper.
Chemical change; new substances (ash, gases) form.
Physical change; only the shape changed.
Chemical change; the temperature of the room changed.
A mysterious cube begins to warm up on its own after two liquids are mixed with it. Which statement best evaluates the situation?
It is definitely a physical change because the cube heats.
It is definitely a chemical change because heating always means chemical change.
It could be an exothermic chemical reaction, but there is not enough information to be certain.
It is endothermic because the cube gets warmer.
Writing on a sheet of paper is best described as which type of change?
Chemical change because ink reacts with air.
Physical change because the paper’s chemical formula remains the same.
Chemical change because color appears.
Physical change because new substances form.
Two liquids are combined and the mixture cools down. Which type of reaction is most likely occurring, and where is the heat going?
Exothermic; the system releases heat to the surroundings, so it warms up.
Endothermic; the system absorbs heat from the surroundings, so the mixture cools.
Exothermic; the system absorbs heat from the surroundings.
Endothermic; the surroundings release heat into the system, warming it.
Which observation would best indicate that an object’s density is less than 1.0 g/mL (approximately the density of water)?
It sinks in water.
It floats in water.
It dissolves in water.
It reacts with water.
How is density calculated?
Mass × Volume
Mass ÷ Volume
Volume ÷ Mass
Mass + Volume
An object has a mass of 10 g and a volume of 5 mL. What is its density, and will it float in water?
2 g/mL; it will sink.
2 g/mL; it will float.
0.5 g/mL; it will float.
0.5 g/mL; it will sink.
Sugar is added to lemonade and disappears uniformly. Which property of sugar explains this behavior?
Flammability
Solubility
Density
Conductivity
To test if a material has flammability, which kind of change must you perform?
No change at all; just observe.
A physical change such as cutting.
A chemical change such as burning.
Only a change in shape.
Which type of change can be tested without altering the matter of an object?
Chemical change
Physical change
Both chemical and physical changes require altering matter.
Neither can be tested.
Which statement best describes the two ways matter can change, with an example of each?
Matter changes only physically; examples include burning paper and melting ice.
Matter changes only chemically; examples include dissolving sugar and freezing water.
Matter can undergo physical or chemical changes; melting ice is physical, reacting baking soda and vinegar is chemical.
Matter changes are always reversible; rusting and boiling are reversible.
After a physical change, what happens to a substance’s chemical formula?
It becomes completely new.
It partially changes.
It remains the same.
It cannot be determined.
Which example supports that a physical change keeps the same chemical formula?
Wood burning becomes carbon dioxide.
Ice melting to liquid water.
Sugar caramelizing when heated.
Iron rusting.
What happens to the chemical formula after a chemical change?
It remains the same.
It becomes different.
It becomes diluted.
It freezes.
A block of ice melts into a puddle. Is this a physical or chemical change, and why?
Chemical, because a new substance forms.
Physical, because the chemical formula stays the same.
Chemical, because heat is absorbed.
Physical, because gases are released.
A piece of paper burns. Which type of change is this, and what evidence supports it?
Physical; the paper keeps the same formula.
Chemical; the formula changes and produces carbon dioxide.
Physical; the paper cools down.
Chemical; the paper dissolves.
A mysterious cube begins to heat up without other information. What is the best conclusion?
It is definitely a physical change.
It is definitely a chemical change.
There is not enough information; heating could be physical or chemical.
It is neither physical nor chemical.
Writing on paper is best classified as which type of change, and why?
Chemical; a new substance forms.
Physical; the paper’s chemical formula stays the same.
Chemical; carbon dioxide is produced.
Physical; the paper dissolves.
Two liquids are combined and a reaction occurs. The liquids cool down. Which reaction type is this, and where is the heat going?
Exothermic; heat leaves the surroundings.
Endothermic; heat leaves the liquid, cooling it down.
Exothermic; heat enters the liquid.
Endothermic; heat is released to warm the liquid.
Which observation suggests an object’s density is less than 1.0 mg/L?
It sinks in water.
It floats in water.
It dissolves in water.
It reacts with water.
How is density calculated?
Mass plus volume
Mass divided by volume
Volume divided by mass
Mass times volume
An object has a mass of 10 g and occupies 5 mL. What is its density, and will it float in water?
0.5 g/mL; it will float.
2 g/mL; it will not float.
5 g/mL; it will float.
10 g/mL; it will not float.
What is the process called when a liquid changes to a gas?
Condensation
Freezing
Boiling
Sublimation
Sugar is added to lemonade to make it sweeter. Which property of sugar allows it to dissolve?
Density
Solubility
Flammability
Boiling point
What is the name of the chemical property of an object that can burn?
Solubility
Flammability
Conductivity
Elasticity
To determine if an object has the property that allows it to burn, would you perform a physical or chemical change?
Physical change, because burning doesn’t change matter.
Chemical change, because burning is always a chemical change.
Physical change, because it’s reversible.
Either physical or chemical change.
Which type of change can be tested without changing the matter of the object?
Chemical change
Physical change
Boiling
Flammability
Which of the following is NOT an example of a physical change?
color
smell
burning
boiling point
Is melting butter for popcorn a chemical or physical change?
chemical
physical
Mrs. Crimmins is making popcorn and melts some butter to pour on top. Is melting butter for popcorn a chemical or physical change?
chemical
physical
Which process is an example of a physical change?
Ice melting
Milk souring
metal rusting
wood burning
Which process is an example if a physical change?
Water turns to steam when boiled
Carbon combines with oxygen to form carbon dioxide gas
Water breaks down into hydrogen and oxygen gases over time
Limestone breaks down into lime and carbon dioxide if heated
Which process is an example of a physical change?
Burning
Rusting
Flattening
Decomposing
Cutting your hair is an example of a ___________ change.
physical
chemical
A new substance is formed in a physical change.
true
false
Is the following an example of a physical or chemical change?
A melting ice cube.
Physical change
Chemical change
Is the following an example of a physical or chemical change?
Baking a cake.
Physical change
Chemical change
A change that does not result in a new substance being formed.
Transformation
Chemical Change
Physical Change
Substance
Stanley left an ice cube on his kitchen counter. An hour later, Stanley observed that the ice cube melted. Which statement best describes this change?
Ice melting is a physical change because a new substance is created.
Ice melting is a chemical change because a new substance is created.
Ice melting is a chemical change because it may be reversed.
Ice melting is a physical change because it may be reversed.
a. The glass now has less water in it. What happened to the water?
condensation
gas
evaporation
solid
The heat from the sun is causing the water to _________.
evaporate
condensate
boil
freeze
