Consider the following list of substances:

Question

carbon dioxide,  CO2

hydrogen gas,  H2

magnesium,  Mg

sodium chloride,  NaCl

methane,  CH4

potassium,  K

Which of the substances are compounds?

(1 point)
Responses

only CO2
, H2
, NaCl
, and CH4
only cap c cap o sub 2 , cap h sub 2 , cap n A cap c l , and  cap c cap h sub 4

only CO2
and CH4
only  cap c cap o sub 2 and  cap c cap h sub 4

only CO2
, Mg
, NaCl
, CH4
, and K
only cap c cap o sub 2 , cap m g , cap n A cap c l , cap c cap h sub 4 , and  cap k

only CO2
, NaCl
, and CH4
only cap c cap o sub 2 , cap n A cap c l , and  cap c cap h sub 4
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Answer 1

To determine which substances are compounds, we first need to understand the definitions:

• A compound is a substance formed when two or more elements are chemically bonded together.
• An element is a pure substance that cannot be broken down into simpler substances by chemical means.

Now, let's analyze the given substances:

1. Carbon dioxide, CO2 - This is a compound composed of carbon and oxygen.
2. Hydrogen gas, H2 - This is an element as it consists of diatomic hydrogen molecules.
3. Magnesium, Mg - This is an element.
4. Sodium chloride, NaCl - This is a compound composed of sodium and chlorine.
5. Methane, CH4 - This is a compound composed of carbon and hydrogen.
6. Potassium, K - This is an element.

From this analysis, the compounds in the list are:

• CO2
• NaCl
• CH4

The correct response is:

only CO2, NaCl, and CH4

Answer 2

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Answer 3

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