Question

PLEASE PLEASE HELP ITS PAST DUE AND IM CLUELESS ILL GIVE BRAINLIEST TO THE FIRST CORRECT ANSWER

Answer 1

Question:

Which of the following would be the evidence of a physical change?

a. change in state of matter

b. precipitate was formed

c. unexpected change in odor

d. formation of bubbles

Answer:

A. Change in state of matter!

Explanation:

How to know it evidence of physical change!

• EXPECTED color change.

• Change in SIZE or SHAPE.

• Change in state of matter.

• Reversible.

• No NEW substance formed!

Answer 2

Answer:

$\boxed {\boxed {\sf A. \ Change \ in \ state \ of \ matter}}$

Explanation:

A physical change occurs when only the physical properties change. They are generally reversible and no new substances are formed.

However, in a chemical change, the chemical structures and properties change, plus new substances are formed.

Let's analyze each answer choice.

1. Change in state of matter

The state of matter is a physical property, so this is a physical change.

2. Precipitate was formed

A precipitate is a solid formed in a liquid solution. This is a new substance and a chemical change.

3. Unexpected change in odor.

A change in odor is a sign of chemical change.

4. Formation of bubbles

Bubbles signify the formation of gas or a new substance.

So, the best answer choice is A. change in state of matter