sample questions 1.1

(answers are at the bottom)

1. If I have 1 atom of Carbon all by itself (no bonds), do I have an atom or a molecule of carbon?

2. My beaker is filled with nitrogen gas (N2). Which of the following do I have? An element, a molecule and/or a compound?

3. In the same beaker of nitrogen gas, I add Helium gas. Neither gas binds to the other. But there are two types of atoms in my beaker. Do I have a compound?

4. Nitrogen oxide (NO), water (H2O), and carbon dioxide (CO2) are examples of what?

5. If I have 2 or more of the same type of atom (e.g.: oxygen), what do I call the group of atoms?

6. Can a compound be a single atom?

________________________________________________________________________

ANSWERS

1. an atom. A molecule is two or more atoms bonded together. Therefore a single atom can never be a molecule.

2. an element (because there is only one type of atom in the beaker) and a molecule (because nitrogen gas is made up of two nitrogen atoms bonded together).

3. No. A compound is only formed when two or more different types of atoms bond together to form a molecule of differing atoms.

4. Compounds!

5. Element.

6. Never. A compound is only formed when two or more different types of atoms bond together to form a molecule of differing atoms. Therefore a compound is always a molecule and never a single atom.

CONGRATULATIONS! NOW FEEL FREE TO DO THE NEXT TUTORIAL.

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