Question

Check my answers

Answer 1

1. A substance that can be separated into two or more substances only by a chemical change is a(n) _____.

solution
element
mixture
compound <-- My answer

2.
Which of the following materials is a substance?

air
gasoline
stainless steel
silver<-- My answer

3.
The first figure in a properly written chemical symbol always is _____.

boldfaced
capitalized<-- My answer
italicized
underlined

4.
Which of the following represents a compound?

H
H-3
H2O<-- My answer
O-16

5. What do chemical symbols and formulas represent, respectively?

elements and compounds<-- My answer
atoms and mixtures
compounds and mixtures
elements and ions

Answer 2

First one right!

Compunds require some chemical reactions to break.

2: Air is not a substance
Gasoline is not a substance.
silver seems right as a substance ,though we can call it as an element also.

3rd: seems right to me.
4rth: H20 is a compound..right
5th right as well..

All seems right to me..

Answer 3

If any of them is incorrect then let me know? which one is it and why.

Answer 4

For 2 everything is a substance air and gasoline are both substances. Just silver is an element so I just picked the odd one out.

Can you explain number 5?

Answer 5

Chemical symbols - a shorthand for elements.
Compound - two or more elements chemically combined.

Answer 6

Chemical formulas --> combinations of chemical symbols representing compounds.

Answer 7

I think gasoline, stainless steel and air are considered as a mixture.

Answer 8

1d
2d
3b
4c
5a
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