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

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. For example, when ice (solid water) melts to form liquid water, it is still \(H_2O\).
• Question 13: 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).

Answer:

• Question 12: False
• Question 13: a. gas, b. liquid, d. solid