Identify each of the following observations as evidence of either a physical change or a chemical change.
(a) A piece of copper is heated until it melts.
(b) A piece of aluminum corrodes in a solution of acid.
(c) A piece of paper burns in a candle flame.
(d) A piece of plastic is stretched until it breaks.
(e) Table salt boils at 1465°C.
Please help as soon as possible god will bless you
Answers
Answered by
2
Answer:
a) physical change
b) chemical change
c) chemical change
d) physical change
e) chemical change
Explanation:
A chemical change is when matter changes into new substances with new properties. Chemical changes cannot be reversible.
A physical change is any change to the physical properties of matter such as size, shape, or state (gas/vapor). Physical changes can be reversible.
As per (D), plastic can be melted once again, and can be reversed back to its initial position. Same with (A- copper).
(B)- all corrosions refer to chemical changes.
(C)- the piece of paper cannot be in its initial position, as it is burned. This also refers to (E).
Similar questions