WorksheetsPhysical and Chemical Changes
Total questions: 21
Worksheet time: 11mins
Lighting a match and baking a cake are two actions that involve chemical changes. Why are these actions considered chemical changes?
A.
they change the state of matter
.
B.
They create new substances.
C.
They change volume.
D.
They create energy.
Louis was investigating physical and chemical changes in matter. Which of these changes that Louis found involves a chemical change in matter?
A.
evaporation of water
B.
grinding of rock
C.
melting of ice
D.
rusting of iron
Emily made a chart that included physical changes and chemical changes. Which change should be categorized as a chemical change?
A.
iron becomes rusty
B.
a gold bar is melted
C.
lake water evaporates
D.
a granite rock is polished
Which event is an example of a chemical change?
A.
fog rising off a river
B.
wood burning in a fireplace
C.
ice cream melting in the sunshine
D.
grinding peppercorn into pepper flakes
A.
fog rising off a river
B.
wood burning in a fireplace
C.
ice cream melting in the sunshine
D.
grinding peppercorn into pepper flake
Which statement BEST describes the formation of rust?
A.
Rust results from a physical mixing of iron with water.
B.
Rust forms from a chemical breakdown of old metal.
C.
Rust results from a chemical reaction between iron and water.
D.
Rust forms from a physical change when wind blows against metal.
Which is an example of a chemical reaction?
A.
Vinegar added to baking soda forms a gas.
B.
Water evaporates into air.
C.
Sugar dissolves in water.
D.
Corn kernels are crushed to form flour.
A chemical change happens when
A.
glass breaks into pieces.
B.
dough bakes in an oven.
C.
ice cream melts into a liquid.
D.
electricity flows through a wire.
When a person chews, saliva from the mouth mixes with starches in food. These starches begin to turn into sugars. Changing starches into sugars is BEST described as
A.
a phase change.
B.
a cellular change
C.
a physical change
D.
a chemical change.
9. Which part of digestion is mainly a chemical change?
A.
Teeth break food into small pieces.
B.
Throat muscles push food toward the stomach.
C.
Stomach acids dissolve food into nutrien
D.
Intestinal cells transport nutrients into the blood.
10. A type of cold pack has two separate sections inside. One section contains a liquid and the other section contains a powder. When the cold pack is squeezed, the section that holds the liquid breaks. When the liquid combines with the powder, the pack becomes very cold.
Which is the BEST explanation why the temperature of
A.
A mixture forms.
B.
A solution forms.
C.
A chemical change occurs.
D.
Thermal energy is used.
11. A jeweler melts gold to make jewelry. As the gold melts, the mass
A.
increases.
B.
decreases.
C.
is destroyed.
D.
stays the same
12.
A group of students weighed a sealed jar full of heavy cream. Then they shook the jar until the cream separated, and then they weighed the jar again. Which of the following would BEST describe its weight?
A.
The jar will have gained weight because some liquid changed to a solid.
B.
The jar will have gained weight because shaking added energy to it.
C.
The jar will have lost weight because of friction from shaking the liquid.
D.
The jar will have kept the same weight because it did not gain or lose any matter
15.
Missy and Ethan discussed examples of the types of changes in matter. In which example is a chemical change taking place?
A.
A piece of metal is cut in half.
B.
An ice cube melts on a counter.
C.
A camper roasts marshmallows over a burning fire.
D.
A baker mixes together flour and sugar to make dough.
18. A student kept a notebook during an investigation. Which recorded observation was MOST likely a physical change?
A.
The solution was heated for two minutes until it boiled.
B.
A solid formed when two liquids were mixed together.
A solid formed when two liquids were mixed together.
C.
D.
The color of two mixed solutions changed from clear to white
20.
When frozen carbon dioxide (CO2) is heated, it changes directly into a gas. Which statement BEST indicates that a physical change has taken place?
A.
Heat caused an increase in gas production.
B.
Heat caused a new substance to form.
C.
Heat caused a decrease in energy.
D.
Heat caused a change in state.
21.
Students performed an investigation on how aluminum cans taken to a recycle center were able to be reused. They found out an aluminum can undergoes which type of change?
A.
a physical change because the can is heated
B.
a chemical change because new metal is formed
C.
a physical change because the material remains the same
D.
a chemical change because an old can is changed into a new can
22.
Manuel was having trouble opening a new glass jar of pickles. His father told Manuel to hold the metal lid of the jar under running hot water for a few seconds, then try again. Then the lid opened easily. What is the MOST likely reason Manuel’s father suggested using hot water to loosen the lid?
A.
Glass contracts when it is heated.
B.
Metals expand when they are heated.
C.
Metals are easier to grip when they are warm.
D.
Hot water reduces friction between metal and glass.
25.
Which properties of a chocolate candy bar will stay about the same after the candy bar is melted?
A.
shape and physical state
B.
mass and color
C.
temperature and hardness
D.
thickness and texture
27.
Which of these is NOT an example of a physical change of state?
A.
boiling
B.
stirring
C.
freezing
D.
evaporating
28.
Some power plants produce energy by burning coal. In these power plants, the heat from burning coal is used to boil water. Which statement BEST describes the changes that occur when burning coal and boiling water?
A.
Burning coal and boiling water are both physical change
B.
Burning coal and boiling water are both chemical changes.
C.
Burning coal is a chemical change, and boiling water is a physical change.
D.
Burning coal is a physical change, and boiling water is a chemical change
30.
A potter molded wet clay into the shape of a bowl and let it dry. The potter knows that the clay went through a physical change when it became a bowl because the bowl
A.
is a different color than the wet clay.
B.
is the same substance as the wet clay.
C.
has a different texture than the wet clay.
D.
holds the same amount of water as the wet clay.
