Physical & Chemical Properties/Changes

Question 1

what is a chemical change?

Answer 1

when matter changes into an entirely different substance with different chemical properties (aka chemical reaction)

Question 2

what are chemical properties?

Answer 2

properties that can be measured or observed only when matter undergoes a change to become an entirely different kind of matter

Question 3

what are some chemical properties

Answer 3

rusting, reactivity, flammability

Question 4

what is reactivity

Answer 4

the ability of matter to combine chemically with other substances

Question 5

what is flammability

Answer 5

the ability of matter to burn

Question 6

what is a physical change

Answer 6

change in one or more physical properties of matter without any change in chemical properties

Question 7

examples of physical change(s):

Answer 7

changes in size, shape, or state of matter

Question 8

what are some processes that cause physical change

Answer 8

cutting, bending, dissolving, freezing, boiling, and melting

Question 9

can you reverse physical changes?

Answer 9

SOME physical changes can be reversed
example: when liquid water freezes to form ice, it can be changed back to liquid water by heating and melting the ice (because the chemical properties of matter remain the same in a physical change, a physical change is often easy to reverse)

Question 10

what are physical properties?

Answer 10

properties that can be measured or observed without matter changing to an entirely different substance (they are typically things you can detect with your senses)

Question 11

what are some physical properties

Answer 11

• typically can be things detectable with your senses: things you can see, hear, smell, or feel
• state of matter: liquid, solid, gas
• odor, boiling point, ability to conduct heat, conductivity (ability to conduct electricity), ability to dissolve in other substances, melting point, color, hardness