Question

1. . Are these physical or chemical changes? a) slicing cheese

b) acid reacting with baking soda to make carbon dioxide
c) emptying a gas cylinder of air
d) cooking eggs​

Answer 1

A physical change is
-temporary
-reversible
-when no new substance is formed
A chemical change is
-permanent
- irreversible
-where a new substance is formed


Answers:
a) Physical
b) Chemical
c) physical
d) chemical

Answer 2

physical change

slicing cheese

acid with baking soda

.......cookoing eggs