Question

question 12 (5 points)
changes from melting and freezing are chemical changes.
true
false

question 13 (5 points)
what states can matter exist in? choose all that apply.
a gas
b liquid
c none of these are correct
d solid

question 14 (5 points)
which of the following describes a chamical property?
a ability to burn
b color
c density
d melting point

Explanation:

Question 12

Melting (solid to liquid) and freezing (liquid to solid) are physical changes as the chemical composition of the substance remains the same. Only the state of matter changes.

Matter can exist in three common states - solid (definite shape and volume), liquid (definite volume but no definite shape), and gas (no definite shape or volume).

A chemical property is a characteristic of a substance that is observed during a chemical reaction. The ability to burn (combustion) is a chemical property as it involves a chemical change. Color, density, and melting point are physical properties as they can be observed without changing the chemical composition of the substance.

Answer:

False

Question 13