Unit 4 : Reactions Recap (Lessons 1-4)

Which of the following is an example of physical change?

• Mixing baking soda and vinegar together, and this causes bubbles and foam.

• A glass cup falls from the counter and shatters on the ground.

• Lighting a piece of paper on fire and the paper burns up and leaves ashes.

• Baking a birthday cake for your mother.

Which of the following is an example of chemical change?

• Filling up a balloon with hot air.

• Taking a glass of water and freezing it by placing it in the freezer.

• A plant collecting sunlight and turning it into food.

• Your dog ripping up your homework.

Which change can be easily be reversed?

• Chemical Change

• Physical Change

• Both a physical and chemical change

• Neither a physical or chemical change

When a new substance is formed with different properties than the original substance it is called a

• Chemical change

• Physical change

• Freezing

• Boiling

If the chemical properties of a substance remain unchanged and the appearance or shape of an substance changes it is called a

• Chemical change

• Physical change

• Both a physical and chemical change

• Neither a physical or chemical change

Which is an example of a physical change?

• Metal rusting

• Silver tarnishing

• Water boiling

• Paper burning

What characteristic best describes what happen during a physical change?

• Composition changes

• Composition stays the same

• Form stays the same

• Mass is lost

Which is an example of chemical change?

• Water freezes

• Wood is cut

• Bread is baked

• Wire is bent

Which is not a clue that could indicate a chemical change?

• Change in color

• Change in shape

• Change in energy

• Change in odor

What property stays the same during physical and chemical changes?

• Density

• Shape

• Mass

• Arrangement of particle