chemistry exam review

1. Final exam review
12 molecules of water will contain
_______ atoms H and _______
atoms oxygen.
24 12

2. The seven SI units are the mole, ___,
ampere, kg, candela, _____ , second.
K
meter

3. One mole of water weighs…
• 18 grams
• And contains how many molecules??
• 6.02 E 23
• How many total atoms?
• 6.02E23 times 3 = 1.8E24

4. True or false – Some atoms of
oxygen weigh more than others.
• True – these are called ISOTOPES.
• They weigh more because they contain
different numbers of what?
• Neutrons !

5. S P D and F are letters used in …
• A) electron configurations
• B) energy calculations
• C) gas law calculations
• D) phase configurations

6. The chemical formula for calcium
chloride is…
CaCl2

7. Carbon dioxide is a
• A) molecule
• B) formula unit
• C) element
• D) metal

8. The mass number of fluorine is
• A) 19
• B) 20
• C) 9
• D) 18.998

9. How many neutrons in a normal
atom of BORON?
•SIX

10. How many protons in an atom of
potassium?
• A) 19
• B) 20
• C) 988974
• D) 39.098

11. What is the most likely isotope of
lithium?
• A) one with 4 neutrons
• B) one with 3 neutrons
• C) one with 5 neutrons
• D) one with no neutrons
• E) one with 7 neutrons

12. Add these using sig figs WITHOUT
a calculator.
12.08+3.002+4.9= 20.0

13. Is NaCl a formula unit or molecule?
Formula
unit

14. Is O2 a formula unit or molecule?
molecule

15. Convert 12 mm to cm?
1.2

16. Name FeO
Ferrous oxide or
Iron (ll) oxide

17. How many SIG FIGS in 120,050 ??
5

18. How many SIG FIGS in 0.002030 ??
4

19. How many SIG FIGS in 12.80 ??
4

20. What does ½ mole of carbon dioxide
weigh?
22 grams

21. What do you get when you dissolve
CaCl2 in water??
Ca+2 ions and
2Cl- ions

22. What is the formula of calcium
chlorate?
Ca(ClO3)2

23. How long is the line?
2.50 cm

24. What is the fuel burned in a Bunsen
burner?
Methane, natural
gas

25. If you have a “mad scientist” flame
that is big and out of control and
yellow you need to adjust the
______ intake to make the flame
blue.
Air or oxygen

26. CaO is _________ __________.Calcium oxide

27. P2O is _________ __________.
Diphosphorus monoxide

28. Mg + KCl yields __________.
NO REACTION

29. MgCl2 + KOH yields __________
as the precipitate.
Magnesium hydroxide

30. MgCl2 + KOH yields __________
as the spectator ions
K+ and Cl-