1. Which of the following people is most closely associated with the "plum-pudding" model?

1. Chadwick
2. Rutherford
3. Thomson
4. Dalton
5. Millikan

2. Which of the following people is well known for his "atomic theory"?

1. Chadwick
2. Rutherford
3. Thomson
4. Dalton
5. Millikan

3. How many neutrons does the isotope chlorine-37 contain?

1. 17
2. 18
3. 20
4. 37
5. 54

4. Which of the following is the appropriate symbol for the species containing 46 neutrons,

34 protons and 36 electrons?

1. Se^2-
2. Se^2-
3. Hg²⁺
4. Kr
5. Kr^2-

5. Element Q possesses three stable isotopes having the following masses and percent

abundances. What is the identity of the element?

6. The formation of cations and anions involves the loss or gain of ____________.

A. protons B. neutrons C. electrons D. nuclei E. neutrinos

7. An isotope’s mass number is the same as its

A. atomic number

B. number of protons

C. number of neutrons

D. number of electrons

E. none of these

8. Which of the following is an empirical formula?

A. P₂O₅ B. C₃H₈O₂ C. C₆H₆O D. NH₃ E. all of these

9. Which of the following atoms will most likely form an anion?

A. I B. Na C. Pb D. Kr E. all of these are likely

10. Which of the following pairs of names and formulas is correct?

Name Formula

A. sodium cyanide Na₂CN

B. lead (II) carbonate PbCO₃

C. iron (II) oxide Fe₂O₃

D. potassium nitrate KNO₂

E. copper (I) sulfate CuSO₄

11. Which of the following is the correct formula for chloric acid ?

12. How many water molecules are in one formula unit of magnesium chloride hexahydrate?

A. 1 B. 4 C. 6 D. 8 E. 10

13. How many oxygen atoms are in one formula unit of aluminum sulfate?

A. 4 B. 6 C. 8 D. 9 E. 12

14. An ionic compound has the formula X₃PO₄ ? What element would best substitute for "X"

in this compound?

A. lithium B.magnesium C. aluminum D. zinc E.all of these

15. What is the correct name for TiBr₄ ?

A. titanium tetrabromide

B. titanium bromide

C. titanium (II) bromide

D. titanium (IV) bromide

E. titanius bromidious

16. Which of the following pairs of names and formulas is NOT CORRECT?

Name Formula

A. dinitrogen tetroxide N₂O₄

B. carbon disulfide CS₂

C. magnesium dibromide MgBr₂

D. phosphorus pentachloride PCl₅

E. all of these are correct

17. The mass of 6.022 x 10²³ units of CO₂ would be called the __________ of CO₂ .

18. The _______________formula tells how many atoms are in a molecule, and the

___________ formula shows how they are connected to each other.

19. What is the molar mass of Mg(NO₃)₂ ?

A. 54.32 g

B. 100.33 g

C. 134.32 g

D. 148.33 g

E. 172.64 g

20. 15.8 grams of iron = _________________moles of iron

21. How many oxygen atoms are in 3.08 grams of ozone, O₃ ?

22. How many moles of carbon are in 3.25 moles of Na₂C₂O₄ ?

23. What is the %(w/w) composition of oxygen in Sn(OH)₂ ?

24. How many grams of bromine are in 22.8 grams of CaBr₂ ?

25. A compound is found to have the following composition:

C: 31.9%

H: 5.36%

Cl: 62.8%

The simplest formula for this compound is:

A. C₃H₅Cl₂

B. C₂H₃Cl

C. C₃H₆Cl₂

D. C₂H₆Cl₃

E. C₂H₅Cl₃

26. A 45.8 grams of CaCl₂ • 2H₂O are heated until all the "hydrated water" is removed. What is the mass of the remaining "anhydrous" CaCl₂ ?

27. How many atoms are in a thin sheet of gold having the dimensions, 0.22 mm by 30.0 cm

by 11.2 cm? The density of gold is 19.3 g/cm³ .