1. Chemistry 101
Answers

2. 1. What makes the properties of atoms (and elements) different from one another?

3. 1. What makes the properties of atoms (and elements) different from one another?
“The number of protons an atom has determines most of the properties of the atom. Each different atom has a different number of protons. Atoms with the same number of protons are the same element, even if they have different numbers of electrons or neutrons.”

4. Hydrogen vs. Carbon

5. 2. Label the information provided in the periodic table.

7. 2. Label the information provided in the periodic table.
Atomic Number (# of Protons) Symbol Element Avg. Atomic Mass

8. 3. What does the atomic mass represent?

9. 3. What does the atomic mass represent?
“The atomic mass number is the sum of the protons and neutrons in the nucleus.”
Protons + Neutrons = Mass Number

10. 4. List the six most important elements in the human body.

11. 4. List the six most important elements in the human body.
“Only the lighter elements occur in living organisms. In general, organisms are made up of about 25 of the elements in the top four rows of the periodic table. Six of these elements are extremely important: Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorous, and Calcium.”

12. Living cells contain anywhere from 65 to 90% water (H20) by weight, so most of the human body’s mass is oxygen.

13. 5. How is a molecule different from a compound?

14. 5. How is a molecule different from a compound?
Combinations of atoms are called molecules. A molecule is a part of matter that is made up of more than one atom. Molecules may contain one kind of atom or more than one kind of atom.
Compounds are made up of two or more different kinds of atoms.
All compounds are molecules, but not all molecules are compounds.

15. For example, water (H20) is a molecule and a compound
For example, water (H20) is a molecule and a compound. N2 is a molecule, but not a compound.

16. 6. The formula for Vitamin C is C6H6O6
6. The formula for Vitamin C is C6H6O6. Name the elements and the number of atoms of each element in one molecule of Vitamin C.

17. 6. The formula for Vitamin C is C6H6O6
6. The formula for Vitamin C is C6H6O6. Name the elements and the number of atoms of each element in one molecule of Vitamin C.
Carbon (6 atoms)
Hydrogen (6 atoms)
Oxygen (6 atoms)

18. 7. Can atoms be destroyed in a chemical reaction?

19. 7. Can atoms be destroyed in a chemical reaction?
No, not a chemical reaction.
But in nuclear fusion and fission…