Question

k i got 2 questions

Which of the following is a chemical change?
A. mixing
B. melting
C. grinding
D. tarnishing


Rubber is unusual in that it shrinks or contracts when heated. Warming a rubber ball will -
A. decrease its density.
B. cause its volume to remain the same.
C. increase its density.
D. decrease its mass.

Answer 1

i put d for second

Answer 2

Tarnishing is usually due to oxidation of the metal

Answer 3

d for number 1

Answer 4

Everything else is a physical change, where the substance in question is still the same substance, with no oxidation layer.

Answer 5

Warming a piece of rubber won't decrease its mass due to the law of the conservation of mass

Answer 6

If you heat up rubber, its density will change

Answer 7

k thanks

Answer 8

so its a

Answer 9

Yes, the second answer is a

Answer 10

k thanks