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Chemistry Placement Exam Questions and Answers, Exams of Chemistry

A series of multiple-choice questions covering various topics in chemistry, including chemical formulas, balancing equations, stoichiometry, molecular geometry, and acid-base reactions. it's suitable for students preparing for a chemistry placement exam or reviewing fundamental concepts. The questions test knowledge of chemical principles and problem-solving skills, making it a valuable resource for self-assessment and exam preparation.

Typology: Exams

2024/2025

Available from 05/02/2025

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Sample Chemistry Placement Exam
Questions with Certified Answers
Answer: Oxygen
Aluminum forms a +3 ion. In order for the formula unit Al₂X₃ to be electrically neutral, the
element X must form a -2 ion. Nonmetals in the oxygen column do this. Of these elements, only
oxygen is a diatomic gas.
Aluminum reacts with element X to form a compound with the formula A₂X₃. Element X exists
as diatomic molecules, X₂, in the gaseous state at normal temperature and pressure. Element
X must be?
Answer: 5
The balanced equation is 2 C₂H₄O + 5 O₂ → 4 CO₂ + 4 H₂O
What is the coefficient of O₂ when the following equation is balanced?
C₂H₄O + O₂ → CO₂ + H₂O
Answer: 2.00
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Sample Chemistry Placement Exam

Questions with Certified Answers

Answer: Oxygen

Aluminum forms a +3 ion. In order for the formula unit Al₂X₃ to be electrically neutral, the element X must form a - 2 ion. Nonmetals in the oxygen column do this. Of these elements, only oxygen is a diatomic gas.

Aluminum reacts with element X to form a compound with the formula A₂X₃. Element X exists as diatomic molecules, X₂, in the gaseous state at normal temperature and pressure. Element

X must be?

Answer: 5

The balanced equation is 2 C₂H₄O + 5 O₂ → 4 CO₂ + 4 H₂O

What is the coefficient of O₂ when the following equation is balanced?

C₂H₄O + O₂ → CO₂ + H₂O

Answer: 2.

8.00 mol GeF₃H ( 1 mol GeH₄/ 4 mol GeF₃H) = 2.00 mol GeH₄

How many moles of GeH₄ are needed to form 8.00 moles of GeF₃H according to the following reaction?

GeH₄ + GeF₄ → 4 GeF₃H

Answer: A nonmetal

Nonmetals are toward the upper right of the periodic table. All the elements in the fluorine column are nonmetals.

According to its location in the periodic table, the element bromine (element # 35) is best described as

Answer: NaCl

HCl, hydrochloric acid, is a strong acid. NH₃, ammonia, is a weak base. In a solution of NaHCO₃, sodium hydrogen carbonate (baking soda), the hydrogen carbonate ion,

HCO₃- , acts as a base. Neither the sodium ion Na+, nor the chloride ion, Cl - , which form when NaCl is dissolved in water, has significant acidic or basic properties.

Which of the following species is neither acidic nor basic when dissolved in water

Answer: 2, 3, 6, 1

What are the coefficients for the following

reaction when it is properly balanced?

Na₃PO₄ + Ba(NO₃)₂ → NaNO₃ + Ba₃(PO₄)₂

A) 3.00 mol

Given that 4 NH₃ + 5 O₂→ 4 NO + 6 H₂O,

when 4.50 mol of H₂O are formed, the amount

of NO formed is

A) 3.00 mol B) 6.75 mol

C) 1.50 mol D) 4.50 mol

acid-base neutralization

What type of a reaction occurs when a sodium

hydroxide solution is mixed with an acetic

acid solution?

Answer: A) Ne

Which of the following atoms has the smallest

radius?

A) Ne B) O

C) Li D) B

Answer: Bent

What is the molecular geometry if you have a

double bond, a single bond and 1 lone pair

around the central atom?

D) 21.9 mL

B) Ge

Which one of the following is a metalloid?

A) S B) Ge C) C D) Pb

D) 18

A certain atom has a charge of -2 and has 16

protons and 16 neutrons in the nucleus.

How many electrons does this atom possess?

A) 34 B) 14 C) 32 D) 18

C) 0.

How many moles of pyridine (C₅H₅N) are

contained in 3.13 g of pyridine?

A) 0.00404 B) 25.

C) 0.0396 D) 0.

B) c + b/

Solve the following equation for x:

4x - b = 2x + c

A) c - b - 6

B) c + b/

C) c + b/

D) c - b/

d) 0.7881. m

Calculate the number of cubic meters of water in a fish tank holding 1.029 cubic yards of water. Hint, 1 meter = 1.093 yards.

a) 1.062 m³

b) 0.9414 m³

c) 1.125 m³

C₇H₁ 6(1) + 11 0₂(g) → 7 CO₂(g) + 8 H₂O(I)

0.584 mol

How many moles of CO2 will be produced when 8.34 grams of heptane, C₇H₁₆ are burned?

7,730 ml

What volume (in ml) would 0.345 moles of gaseous CO₂ occupy at STP? Hint, STP is at 0°C and 760 Torr where 22.4 liters contain one mole?

c) HNO₃

Which of the following is a strong acid?

a) NaCl b) NH₃

c) HNO₃ d)CaSO₄

c) CH₂O

Which of the following represent the empirical formula?

a) C₆H₁₂O₆ b) CH₂ = C(OH)₂

c) CH₂O

d) CH₃-C=O

H

a) N₂O₃

The formula for dinitrogen trioxide is

a) N₂O₃ b) NO₃

c) N₂O d) NO

d) 722 torr

Using the graph determine the pressure (in torr) when the temperature is 70 °C.

a) 698 torr b) 716 torr

c) 721 torr d) 722 torr

b) 4.2 x 10¹⁰ ng

Which of the following is the smallest mass?

a) 2.1 kg

b) 4.2 x 10¹⁰ ng

c) 5.8 x 10² g

d) 8.4 x 10⁴ cg

a) 0.15 M

If 250 mL of a 0.50 M NaCl solution is diluted to 840 mL, what is the molarity of the resulting solution?

a) 0.15 M

b) 6.7 M

c) 0.60 M

d) 1.7 M

c) Fe₂(SO₃)₃

Iron(III) sulfite has the formula

a) Fe₃SO₃

b) Fe₂(SO₄)₃

c) Fe₂(SO₃)₃

d) Fe₂SO₄

1.2 x 1024 atoms

How many atoms of carbon are in 24 grams of carbon?

d) 354 g

A solution is prepared by dissolving sugar in water. The solution is 25.0%, by mass, sugar. How many grams of WATER are in 472 grams of this solution?

a) 118 g

b) 157 g

c) 408 g

d) 354 g

c) 18.1 mL

26.0 g of a liquid that has a density of 1.44 g/mL needs to be measured out in a graduated cylinder. What volume should be used?

a) 37.4 mL

b) 0.0554 mL

c) 18.1 mL

d) 0.0267 mL

a) dinitrogen trioxide

Which of the following would be the correct name for N₂O₃?

a) dinitrogen trioxide

b) nitrogen(II) oxide

c) nitrogen(III) oxide

d) nitrogen oxide

d) 1.32 mol

How many moles of C₄F₈ are in 265 grams of C₄F₈?

a) 8.55 mol

b) 1.89 x 10-⁵ mol

c) 5.30 x 10⁴ mol

d) 1.32 mol

c) 29.89%

What is the percent, by mass, of oxygen in Zn(BrO₃)₂?

a) 24.83%

b) 39.00%

c) 29.89%

d) 39.79%

d) 37

Given: Z = 0.43Y + 12 ;

What is Y when Z = 28?

b) KS₂

c) K₂S₃

d) K₂S

b) 0.582 km

How many kilometers is 5.82 x 10⁴ cm?

a) 5.82 x 10³ km

b) 0.582 km

c) 5.82 x 10⁹ km

d) 5.82 km

a) 40

Data was collected on an experiment that relates "Stuff" to "Blips". Using a "best fit" line for the data, how much stuff would I have if I had 20 blips?

a) 40 b) 10 c) 20 d) 30

(d) Al(NO₃)₃

The correct formula for aluminum nitrate is

(a) Al₃N₂

(b) Al₃(NO₃)

(c) Al(NO₂)₃

(d) Al(NO₃)₃

(a) liquid to solid

A substance releases heat when it changes from

(a) liquid to solid

(b) solid to gas

(c) liquid to gas

(d) solid to liquid

(c) P

Which element has exactly five electrons in the highest principal energy level (the outer shell)?