Quiz about Honors Chemistry Post Test

Question 1

We know that combustion produces _____ because _____ turns cloudy when mixed with candle smoke.

Accepted Answer

carbon dioxide; limewater

Answer

carbon dioxide; cobalt chloride

Answer

water; limewater

Answer

water; cobalt chloride

Question 2

Which lab experiments below describe a situation where a chemical change has occurred? Check all that apply.

Accepted Answer

After adding zinc to hydrochloric acid (HCl), a student observes bubbles forming in the solution and the temperature increases 10 $$\degree$$ C.

Accepted Answer

After combining an white solid with a clear, odorless liquid, there is a strong smell produced and the temperature increases $$15\degree$$ C.

Answer

A student uses a mortar and pestle (a grinding stone) to break up large pieces of ammonium thiocyanate ( $$NH_4SCN$$ ) into smaller pieces.

Answer

A student dissolves sugar ( $$C_6H_6O_6$$ ) into water ( $$H_2O$$ ). The sugar crystals seem to disappear.

Question 3

Find the volume of a substance that has a density of 19.3 g/cm³ and a mass of 10.0 g.

Accepted Answer

0.518 cm3

Answer

193 cm3

Answer

1.93 cm3

Answer

29.3 cm3

Question 4

Calculate 7.987 m - 0.54 m and give your answer with the appropriate number of significant figures.

Accepted Answer

7.45 m

Answer

7.447 m

Answer

7.4 m

Answer

7.5 m

Question 5

Which of the following will not undergo a reaction?

Accepted Answer

silver metal + zinc oxide

Answer

iron metal + copper(II) oxide

Answer

zinc metal + iron(III) oxide

Answer

magnesium metal + iron(III) oxide

Question 6

What is the name for MgF₂?

Accepted Answer

magnesium fluoride

Answer

magnesium difluoride

Answer

magnesium(II) fluoride

Answer

magnesium fluorite

Question 7

Select the correct formula for sulfur hexachloride.

Accepted Answer

SCl6

Answer

S2Cl6

Answer

S6Cl

Answer

SCl2

Question 8

Name the compound CuCO₃

Accepted Answer

copper(II) carbonate

Answer

copper carbon oxide

Answer

copper(III) carbonate

Answer

copper carbonate

Question 9

What is the mass of 0.75 moles of (NH₄)₃PO₄?

Accepted Answer

111.75 g

Answer

101.75 g

Answer

121.75 g

Answer

131.75 g

Question 10

What is the percent by mass of fluorine in calcium fluoride?

Accepted Answer

49%

Answer

24%

Answer

51%

Answer

65%

Question 11

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.

Accepted Answer

SO3

Answer

SO

Answer

SO2

Answer

SO4

Question 12

What is the molecular formula for a compound with the empirical formula: K₂SO₄and a molecular mass of 696 g.

Accepted Answer

K₈S₄O₁₆

Answer

K2SO4

Answer

K₈SO₁₆

Answer

K₈S₄O₈

Question 13

How much SOCl₂should be produced when 16.2 g SO₂reacts with 13.7 g PCl₅ according to the following equation?SO₂+ PCl₅--> SOCl₂+ POCl₃

Accepted Answer

7.87 g

Answer

30.1 g

Answer

26.4 g

Answer

19.8 g

Question 14

When the temperature of a gas increases the particles

Accepted Answer

speed up and move farther apart.

Answer

speed up and move closer together.

Answer

slow down and move closer together.

Answer

slow down and move farther apart.

Question 15

How many neutrons does this isotope of titanium have?

Accepted Answer

26

Answer

48

Answer

22

Answer

70

Question 16

Which nuclear power plants part's function is to reduce the energy of fast neutrons so that the core can capture them?

Accepted Answer

moderator

Answer

coolant circulator

Answer

control rods

Answer

2nd water loop

Question 17

Which of these elements has the lowest ionization energy?

Accepted Answer

sulfur

Answer

oxygen

Answer

fluorine

Answer

chlorine

Question 18

If astatine-209 (atomic number 85) decays via alpha decay, what isotope will result?

Accepted Answer

₈₃²⁰⁵Bi

Answer

₈₆²⁰⁹Rn

Answer

₈₁²⁰⁷Tl

Answer

₈₅²⁰⁸At

Question 19

Emission of light from an atom occurs when an electron

Accepted Answer

drops from a higher to a lower energy level.

Answer

jumps from a lower to a higher energy level.

Answer

moves within its atomic orbital.

Answer

falls into the nucleus.

Question 20

What electron configuration matches an oxygen atom?

Accepted Answer

1s²2s²2p⁴

Answer

1s²2s²2p⁶3s2, 3p⁶4s²3d¹⁰4p⁵

Answer

1s²2s²2p⁶

Answer

1s²2s²2p⁶3s²3p⁶4s²3d¹

Question 21

The following is the electron configuration for what element?

[Xe] 6s²4f¹⁴5d⁹

Accepted Answer

gold

Answer

mercury

Answer

platinum

Answer

thallium

Question 22

24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
What is the average mass of this element?

Accepted Answer

74.92 amu

Answer

24.97 amu

Answer

75.01 amu

Answer

74.51 amu

Question 23

The half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0 g?

Accepted Answer

0.25g

Answer

3.0g

Answer

0.25mg

Answer

0.3g

Question 24

Which atom has the largest atomic radius?

Accepted Answer

rubidium

Answer

potassium

Answer

calcium

Answer

strontium

Question 25

What molecular geometry is the structure shown here?

Accepted Answer

trigonal planar

Answer

linear

Answer

tetrahedral

Answer

trigonal pyramidal

Question 26

For which of the following would hydrogen bonding occur between molecules?

Accepted Answer

Option D is correct

Answer

A.

Answer

B.

Answer

C.

Question 27

How many mL of stock solution of 2.0 M NaCl do you need to prepare 100.0 mL of 0.150 M NaCl?

Accepted Answer

7.5 mL

Answer

15 mL

Answer

1300 mL

Answer

200 mL

Question 28

What is the molarity in 650. ml of solution containing 63 grams of sodium chloride?

Accepted Answer

1.7 M

Answer

2.4 M

Answer

0.86 M

Answer

0.54 M

Question 29

In a famous experiment conducted by Ernest Rutherford, a few positively charged alpha particles were scattered by a thin gold foil. Which of the following is a conclusion that resulted from this experiment?

Accepted Answer

The nucleus is very small and the atom is mostly empty space.

Answer

The nucleus is negatively charged.

Answer

The atom is a dense solid and is indivisible.

Answer

The mass is conserved when atoms react chemically.

Question 30

This type of nuclear radiation has the highest penetrating power. It can penetrate our body, causing damage to DNA. Even several cm thick of lead or several meters thick of concrete cannot stop all of it.

Accepted Answer

gamma

Answer

alpha

Answer

beta

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