Question

Consider the following list of substances: carbon dioxide, CO2 C O 2 hydrogen gas, H2 H 2 magnesium, Mg M g sodium chloride, NaCl N a C l methane, CH4 C H 4 potassium, K K Which of the substances are compounds? (1 point) Responses 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 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

Answer 1

To determine which substances in the list are compounds, we need to identify the substances that consist of two or more different elements chemically bonded together.

1. Carbon dioxide (CO2) - a compound made of carbon and oxygen.
2. Hydrogen gas (H2) - not a compound; it consists of only hydrogen atoms.
3. Magnesium (Mg) - an element, not a compound.
4. Sodium chloride (NaCl) - a compound made of sodium and chlorine.
5. Methane (CH4) - a compound made of carbon and hydrogen.
6. Potassium (K) - an element, not a compound.

Based on this analysis, the compounds in the list are:

• CO2
• NaCl
• CH4

Therefore, the correct response would be "CO2, NaCl, and CH4 only".