Lesson 1: Physical and Chemical Changes

Question 1

Physical change

Answer 1

changes that affect one or more physical properties of a substance

Question 2

Chemical change

Answer 2

process when one or more substances change into an entirely new substance

Question 3

Law of conservation of mass

Answer 3

states that in an ordinary chemical change and physical change, mass is not created nor destroyed but is only transformed into different substances

Question 4

Physical changes of matter

Answer 4

texture, shape, size, color, odor, volume, mass, weight, pH, and density

Question 5

Chemical changes of matter

Answer 5

production of gas, odor, precipitation, energy, fizzing, foaming, temperature change, and color

Question 6

How does temperature influence Chemical changes?

Answer 6

at higher temperatures the particles in a substance have more average kinetic energy, they move around more freely which causes the chemical change to go faster

Question 7

Endothermic

Answer 7

cooling

Question 8

Exothermic

Answer 8

warming