Chem Exam 0 Review

Sig Figs

100

The result of 2.000 X 2.222-4.421 has how many significant figures?

a. 0

b. 1

c. 2

d. 3

e. 4

E. 4

200

Solve for x: x + 4.45=12.1 

Find the x value with the correct number of significant figures

a. 7.6

b. 7.65

c. 7.7

d. 8.

e. both a and b are acceptable

C. 7.7

300

When calculated 0.00478530 is rounded to three significant figures, it becomes...

a. 0.479

b. 0.005

c. 0.00479

d. 0.00478

e. 0.004

B. 0.005

400

How many sig figs are in 3.408 x 10⁴

4

500

When the following calculation is performed, how many significant figures does the answer contain?

1.643 x 10³ + 1.2 x 10²

a. 0

b. 1

c. 2

d. 3

e. 4

E. 4

Stoichiometry

100

A. How many moles are of P₄O₁₀ are there in 50.0 grams of P₄O₁₀

B. How many grams are of P₄O₁₀ are there in 0.782 moles of P₄O₁₀

A. 0.176 Moles

B. 222.0 Grams

200

How many moles of CO₂ are there in 75.3 g of CO₂? How many grams does a 3.57-mol CO₂ sample weigh?

4.18 Moles and 64.3 Grams

300

How many Xenon atoms are contained in 2.36 moles of Xenon

1.42 x 10²⁴ atoms of Xenon

400

How many moles of Kr are contained in 398 mg of Kr? * 1 mole of Kr=83.80

4.75 x 10^-3

500

Iodine reacts with N₂H₄ to form HI and nitrogen gas. How many grams of Iodine are needed to react with 56.7 g of N₂H₄

449.7 g

Nomenclature

100

Whats the name for the prefix 7?

Hepta

200

How would you name PCl₃?

Phosphorous trichloride 

300

What are the 2 ion formulas and systematic name for iron. Bonus if you can name the common names

Fe⁺² (Iron (II)) and Fe⁺³ (Iron (III))

Bonus: Ferrous and Ferric

400

The name for N₂O

Dinitrogen monoxide

500

The name for CS

monocarbon sulfate

Polyatomic Ions

100

What is the polyatomic ion name NH₄⁺

ammonium

200

What is the name for the polyatomic ion MnO₄^-

Permangantate

300

The name for the polyatomic ion SO₃^-2

Sulfite

400

The name for the polyatomic ion H₃O⁺

Hydronium

500

The name for the polyatomic ion Cr₂O₇^-2

Dichromate

Misc.

100

What are the three subatomic particles of an atom and their charges?

Proton: +

Neutron: 0

Electron: -

200

Balance the following chemical equation.

C₇H₁₆ + O₂ --> H₂O + CO₂

C₇H₁₆ + 11O₂ --> 8H₂ + 7O₂

300

What is the empirical formula for C₆H₄(OH)₂

C₃H₂(OH)

400

Gallium has 2 naturally existing isotopes. The Ga-69 (68.926 amu) is 60.11%. What is the amu of the other? Molar mass of Gallium is 69.72

70.924 Amu

500

Which of the following sets of elemets are metalloids?

C, Si, Fe, Rh

F, I, Br, At

Si, Ge, Te, B

Al, Si, P, S

Si, Ge, Te, B