Question 1

What is a physical change?

Accepted Answer

A change which alters the physical properties of a substance without changing its identity

Answer

the formation of a new substance with different properties; cannot be undone by physical means

Question 2

What is a chemical change?

Accepted Answer

the formation of a new substance with different properties; cannot be undone by physical means

Answer

change which alters the physical properties of a substance without changing its identity

Question 3

Which of the following is a physical change?

Accepted Answer

teeth grinding the food

Answer

bacteria converting lactose into simple sugars in the intestines

Answer

digestive enzymes breaking down proteins

Question 4

Which of the following is a chemical change?

Accepted Answer

saliva converting starch into simple sugars

Answer

teeth grinding food

Answer

swallowing the food

Question 5

What is an example of a force that affects motion in organisms?

Accepted Answer

gravity

Answer

magnets

Question 6

Which of the following organs move because of force?

Accepted Answer

Heart

Answer

Brain

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