Question

1. we used __________ to represent an element.
a. chemical formula
b. symbol

2. the chemical formula of a molecule shows the______________.
a. number of atoms contained in the molecule.
b. chemical properties of the molecule.
c. number and kind of atoms contained in the molecule.

3. which of the following is an atom.
a. K
b. CO
c. H2O
d. HI

4. which of the following is a molecule.
a. He
b. N
c. Ar
d. CO

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Answer 1

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1. we used Symbol to represent an element.

2. The chemical formula of a molecule shows the number and kind of atoms contained in the molecule.

3. K (potassium) is the atom among the given choices.

4. CO (carbon - monoxide) is the molecule among given choices.

Answer 2

Answer:

1. we used chemical formula to represent an element.

choice a. is correct

2. the chemical formula of a molecule shows the number and kind of atoms contained in the molecule.

choice c. is correct

3. which of the following is an atom?

= K [Potassium]

choice a. is correct

4. which of the following is a molecule?

= CO [Carbon Monoxide]

choice d. is correct