Unit 13 Lesson 3

Question 1

Physical Changes

Answer 1

When matter changes in a way that does not affect the type of matter
Example: sharpening a pencil
Slicing a pie 🥧

Question 2

Chemical changes

Answer 2

Result in a change in the identity of matter
Example: when a strawberry rots
When iron rusts
When you cook an apple pie

Question 3

Chemical reaction

Answer 3

The process in which new substances are formed during a chemical change

Question 4

When the temperature goes up (increases)

Answer 4

The speed of a chemical change increases

Most matter expands with the exception of water which contracts

Question 5

When the temperature goes down (decreases)

Answer 5

The speed of a chemical change decreases

Most matter contracts with the exception of water which expands

Question 6

Conservation of Mass

Answer 6

The total mass of matter before and after a physical or chemical change remains the same