General Chemistry 1

Matter and Energy

100

What is the formula for density?

density = mass/volume 

200

True or False. 

An element is a pure substance that cannot be separated into simpler substances by any physical process.

FALSE

An element is a pure substance that cannot be separated into simpler substances by any CHEMICAL process.

300

Potassium is a soft, silver-colored metal that melts at 64^oC. It reacts vigorously with water, with oxygen, and with chlorine. Identify all of the physical properties given in this description. 

soft, silver-colored metal, melts at 64^oC

400

Which of the following is true of a gas?

a. has definite volume and shape

b. has no definite volume nor a definite shape

c. has a definite volume but not a definite shape 

d. has no definite volume but has a definite shape 

b. has no definite volume nor a definite shape

500

Which of the following represents the smallest mass?

a. 0.23 g 

b. 2.3 x 10³ ug

c. 0.23 mg

d. 2.3 x 10^-2 kg

c. 0.23 mg

Atoms, Ions, and Molecules

100

Which of the following best defines a proton?

a. a positively charged center of an atom that contains nearly all the atom's mass 

b. a positively charged subatomic particle present in the nucleus of an atom

c. an electrically neutral subatomic particle found in the nucleus of an atom 

d. a subatomic particle that has no negative charge and essentially zero mass 

b. a positively charged subatomic particle present in the nucleus of an atom

200

Elements in groups 3-12 of the periodic table are best known as ______________.

a. alkali metals

b. noble gases 

c. chacolgens 

d. transition metals

d. transition metals

300

Which of the following elements is a metalloid?

a. boron

b. selenium 

c. aluminum 

d. krypton 

a. boron

400

Which of the following names best fits the chemical formula of N₂O₄?

a. nitrogen oxide 

b. nitrogen tetraoxide 

c. dinitrogen tetraoxide 

d. nitrogen(IV) oxide 

c. dinitrogen tetraoxide

500

How many protons, neutrons, and electrons are in ¹¹⁹Sn²⁺?

a. 50 p, 69 n, 48 e-

b. 50 p, 69 n, 50 e- 

c. 69 p, 50 n, 69 e-

d. 50 p, 119n, 52 e-

a. 50 p, 69 n, 48 e-

Stoichiometry

100

What is the formula for percent yield?

% yield = (actual yield/theoretical yield) x 100%

200

Balance the following chemical equation: 

C₂H₄O + O₂ --> HC₂H₃O₂

2C₂H₄O + O₂ --> 2HC₂H₃O₂

300

How many molecules are there in a 3.46 g sample of HCl?

5.71 x 10²² HCl molecules 

400

Zn(s) + 2HCl(aq) --> ZnCl₂(aq) + H₂(g) 

0.30 mol of Zn reacts with 0.52 mol of HCl. Which of the two is the limiting reagent?

HCl

500

How many grams is 0.0654 mol of ZnI₂?

20.9 g 

Solution Chemistry

100

Of the following acids and bases, which one is weak?

a. LiOH

b. HCl

c. Rb(OH)₂

d. HF

d. HF

200

What is the oxidation number of chlorine in HClO₄?

a. -1

b. +1

c. +7

d. +4

c. +7

300

You have 14.8 M NH₃. How many mL of this solution is required to give 100.0 mL of 1.00 M NH₃?

6.76 mL

400

Which of the following compounds is insoluble in water?

a. Hg₂Cl₂

b. KI

c. lead(II) nitrate 

a. Hg₂Cl₂

500

Which of the following is the net ionic equation for the following reaction?

Ca(NO₃)₂(aq) + K₂CO₃(aq) --> CaCO₃(s) + 2KNO₃(aq)

a. Ca(NO₃)(aq) --> Ca²⁺(s) + NO₃-(aq)

b. 2K⁺(aq) + NO₃^2-(aq) --> 2KNO₃(aq)

c. Ca²⁺(aq) + CO₃^2-(aq) --> CaCO₃(s)

d. K₂CO₃(aq) --> CO3^2-(s) + 2K⁺(aq)

c. Ca²⁺(aq) + CO₃^2-(aq) --> CaCO₃(s)