Question 1

A 1 g sample that has a molar mass of 176.12 g/mol is combusted 1.5 g of $CO_2$ and 0.41 g of $H_2O$ . What is the molecular formula of the sample?

Accepted Answer

$C_6H_8O_6$

Answer

$CH_2O$

Answer

$C_3H_4O_4$

Question 2

Which of the following includes exact numbers?

Accepted Answer

The definition of an hour is 3600 seconds

Answer

The measured value for the height of Angel Falls is 3212 feet

Answer

The volume of water is measured as 6.00 mL

Answer

The mass read on the balance is 453.59 grams

Question 3

Which of the following numbers has 3 sig figs?

Accepted Answer

0.0460 cm

Answer

3.0 x 10^2 mol

Answer

0.001 cg

Answer

100 mmol

Question 4

Which  of the following is a chemical change?

Accepted Answer

broiling a steak

Answer

carving a piece of wood

Answer

melting of wax

Answer

boiling of water

Question 5

Consider an atom.  What can vary without changing the identity of the element?

Accepted Answer

number of neutrons and electrons

Answer

number of protons and the atomic number

Answer

number of electrons and the number of protons

Answer

number of neutrons and the atomic number

Question 6

An ionic compound forms when calcium reacts with iodine.  If a sample of the compound
	contains $7.4 x 10^{21}$ calcium ions, how many iodide ions does it contain?

Accepted Answer

$1.4 x 10^{22}$

Answer

$1.4 x 10^{21}$

Answer

$3.7 x 10^{21}$

Answer

$7.4 x 10^{21}$

Question 7

Which of the following have the correct name and formula listed together?

Accepted Answer

$K_2CO_3$·; potassium carbonate

Answer

$(NH_4)_ 2ClO_3$; ammonium perchlorate

Answer

$Na_2HPO_4$; disodium monohydrogen 	phosphate

Answer

$NaNO_2$; sodium nitrate

Question 8

Which of the following is a homogeneous mixture?

Accepted Answer

salt water

Answer

vegetable soup

Answer

oil and water

Answer

cement

Question 9

A compound of iodine and cesium contains 63.94 g of metal and 61.06 g of nonmetal.  How many grams of cesium are in 38.77 g of compound?

Accepted Answer

19.83 g

Answer

23.67 g

Answer

18.84 g

Answer

24.79 g

Question 10

How many protons and  electrons are in an ion of cobalt having a +2 charge?

Accepted Answer

27 p+, 25 e-

Answer

27p+, 29e-

Answer

59 p+, 61 e-

Answer

27 p+, 27 e-

Question 11

Calculate the mass of hydrogen gas produced when 33.61 g of diborane $B_2H_6$ reacts with excess water. $B_2H_6$(g) + $6H_2O$(l) → $2H_3BO_3$(s) +  $6H_2$(g)

Accepted Answer

14.69 g

Answer

131.7 g

Answer

310.0 g

Answer

150.2 g

Question 12

Calculate the volume in liters of 0.385 M manganese(II) sulfate that contains 57.0 g of solute.

Accepted Answer

0.980 L

Answer

0.688 L

Answer

0.145 L

Answer

1.48 L

Question 13

Identify the spectator ions, if any exist, in the following reaction.
	$3CaCl_2(aq)  +  2Cs_3PO_4(aq) →  Ca_3(PO_4)_2(s)   +  6CsCl(aq)$

Accepted Answer

cesium and chloride

Answer

cesium and phosphate

Answer

calcium and chloride

Answer

calcium and phosphate

Question 14

Identify the oxidizing agent and the reducing agent in the following reaction.
	$8NH_3(g)  +  6NO_2(g)   →   7N_2(g)  +  12H_2O(l)$

Accepted Answer

$NO_2$ oxidizing agent, $NH_3$ reducing agent

Answer

$NH_3$ oxidizing agent, $N_2$ reducing agent

Answer

$NO_2$ oxidizing agent, $N_2$ reducing agent

Answer

$NH_3$ oxidizing agent, $NO_2$ reducing agent

Question 15

Lithium (1.62 g) and is reacted with 6.00 g oxygen.  Which of these reactants is the limiting reagent and how much product will be formed.  4Li  +  $O_2$  →  $2Li_2O$

Accepted Answer

Li limiting; 3.50 g product

Answer

O2 limiting; 5.60 g product

Answer

Li limiting; 6.97 g product

Answer

O2 limiting; 11.21 g product

Question 16

The addition of water to an aqueous solution will result in a _____ volume and a _____	concentration.

Accepted Answer

higher, lower

Answer

higher, higher

Answer

lower, lower

Answer

lower, higher

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