CHM 151 Exam 1 Review

Conversions

100

What is 65010000 in scientific notation?

6.501 x 10⁷

200

If I have 16.1 m of rope, how many nm do I have?

1.61 x 10¹⁰ nm

300

If the density of iron is 7.87g/cm³ and it has a mass of 325.7 g, what is the volume?

41.4 cm³

400

A bike tire has pressure of 47.9 pounds/in², what is the pressure in g/cm²? (1 pound= 454 g, 1 in= 2.54 cm)

8560 g/cm²

500

If I deliver a certain medication at rate of 5.2 mg/min, what is the rate in micrograms/sec?

87 micrograms/sec

Periodic table

100

Pb is a... 

& (metal or nonmetal)

Br is a...

metal, nonmetal

200

How many protons, electrons, and neutrons are in Be?

4 protons, 4 electrons, 5 neutrons

300

What element has the isotope ³²₁₆X^2-?

Sulfur

400

How many protons, electrons, and neutrons are in Ca ion with a charge of +2?

20 protons, 18 electrons, 20 neutrons

500

What ion has 53 protons, 54 electrons, 74 neutrons, and a charge of -1?

Iodine ion

Compounds

100

MgO is a covalent compound

True or false?

False

200

What is the name of CCl₄?

Carbon tetrachloride

300

What is the formula for copper(II) nitrate?

Cu(NO₃)₂

400

What is the name of Fe₂S₃?

iron(III) sulfide

500

What is the name of Mn₃(PO₄)₂?

manganese(II) phosphate

Formulas

100

How many grams are in 8.76 mol Sr?

768 g Sr

200

How many atoms are in 45.23 g CH₄?

1.70 x 10²⁴ atoms

300

What is the percent by mass of each element in Al₂(SO₄)₃?

15.77% Al, 28.11% S, 56.12% O

400

What is the empirical formula of a compound containing 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen?

CH₂O

500

What is the molecular formula of a compound with 28.03% Mg, 21.60% Si, 1.16% H, and 49.21% O with a molar mass of 520.8 g?

Mg₆Si₄H₆O₁₆

Solubility & Stoichiometry

100

LiNO₃ is insoluble

True or false

False

200

Complete the reaction:

Al(NO₃)₃(aq) + Na₃PO₄(aq) -->

AlPO₄(s) + 3 NaNO₃(aq)

300

How many molecules sodium sulfate will be formed if you start with 238 grams of sodium hydroxide?

2 NaOH + H₂SO₄ --> 2 H₂O + Na₂SO₄

1.79 x 10²⁴

400

What mass of O₂ will be needed to burn 51.6 g of B₂H₆?

B₂H₆ + 3 O₂ --> 2 HBO₂ + 2 H₂O

179 g O₂

500

What is the complete and net ionic equation of CoBr₃(aq) + K₂S(aq) --> Co₂S₃(s) + KBr(aq)? (Hint: Don't forget to balance)

Complete: 2 Co³⁺(aq) + 6 Br^-(aq) + 6 K⁺(aq) + 3 S^2-(aq) --> Co₂S₃ (s) + 6 K⁺(aq) + 6 Br^-(aq) 

Net: 2 Co³⁺(aq) + 3 S^2-(aq) --> Co₂S₃(s)