Please check the following.

1. What compound is sodium sulfite?

My answer:Na2SO3

2. Which element is a noble gas?

a. N2
b. Cl2
c. Xe
d. I2

My answer: c

3. Which element is most likely to form a cation with a 2+ charge?

a. S
b. P
c. Be
d. Al

My answer: c

4. Which species contains the smallest number of electrons?

a. F
b. O^2-
c. S^2-
d. Cl

My answer: b

5. Who first measured the charge of an electron?

a. Rutherford
b. Medeleev
c. Millikan
d. Laviosier
e. Thomson

My answer: a

6. Convert 4 micrometer to km.

My answer: 4 x 10^-9 km

7. Which of the following volumes is equal to 40 mL?

a. 40 cm^3
b. 40 dm^3
c. 0.40 L
d. 0.00040 kL

My answer: a

8. A ruby has a mass of 12.04 carats (1 carat= 200 mg). Rubies are made of a crystalline form of Al2O3.

a. What percentage of the mass of the ruby is aluminum?

My answer: 52.9%

b. The density of rubies is 4.02 g/cm^3. What is the volume of the ruby?

My answer: 0.5990 cm^3

9. A common mineral in Earth's crust has the chemical composition 34.55% Mg, 19.96% Si, and 45.49% O by mass. What is its empirical formula?

My answer: Mg2SiO4

10. A mass of mercury occupies 0.950 L. What volume, in liters, would an equal mass of ethanol occupy? The density of mercury is 13.546 g/mL and the density of ethanol is 0.789 g/mL.

My answer: 16.3 L

11. How many Fe(II) ions are there in 20.0g FeSO4?

My answer: 7.93 Fe(II) ions

12. Because of the high heat and low humidity in the summer in the Death Valley, California, a visitor requires about one quart of water for every two miles traveled on foot. Calculate the approximate number of liters required for a person to walk 10.0 km in Death Valley.

1 quart=946.35 mL
1 mile=1.60934 km

My answer: 2.94 L

13. What is the empirical formula for Hg2(NO3)2?

a. Hg2(NO3)2
b. Hg(NO3)2
c. Hg(NO3)
d. Hg4(NO3)4

My answer: c

14. Write the formula for the compound formed between potassium and sulfur.

My answer: K2S

15. Determine the name for TiCO3.

My answer: Titanium(II) Carbonate

16. Determine the name for HClO3.

My answer: Chloric acid

17. What is the molar mass of nitrogen gas?

My answer: 28.0g/mol

18. Which of the following has the least tendency to form an ion?

a. Ca
b. K
c. Kr
d. Se

My answer: c

19. A certain alcohol contains only three elements, carbon, hydrogen, and oxygen. Combustion of a 50.0g sample of alcohol produced 95.50g of CO2 and 58.70g of H2O. What is the empirical formula of the alcohol?

My answer: C2H6O

See your later post.