Quiz Midterm Exam Review 1

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Question 2 / 30

What is the molar mass of (NH4)2CO3?

144 g

138 g

96 g

78 g

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Question 3 / 30

The volume of one mole of a substance is 22. 4 L at STP for all ___.

Gases

Liquids

Solids

Compounds

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Question 4 / 30

What is the number of moles in 9. 63 L of H2S gas at STP?

0. 104

0. 430

3. 54

14. 7

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Question 5 / 30

What is the percent composition of chromium in BaCrO4?

4. 87%

9. 47%

20. 5%

25. 2%

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Question 6 / 30

The lowest whole-number ratio of the elements in a compound is called the ___.

Empirical formula

Molecular formula

Binary formula

Representative formula

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Question 7 / 30

A catalyst is ___.

The product of a combustion reaction

Not used up in a reaction

One of the reactants in single-replacement reactions

A solid product of a reaction

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Question 8 / 30

Chemical equations must be balanced to satisfy ___.

The law of definite proportions.

The law of multiple proportions

The law of conservation of mass

Avogadro's principle

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Question 9 / 30

Which of the following statements is NOT true about what happens in all chemical reactions?

The ways in which atoms are joined together are changed.

New atoms are formed as products.

The starting substances are called reactants.

The bonds of the reactants are broken and new bonds of the products are formed.

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Question 10 / 30

What is the change in atomic number caused by the emission of gamma radiation?

Decreases by 2

Decreases by 1

Remains the same

Increases by 1

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Question 11 / 30

If an isotope decays by the process of beta emission, ___.

The mass number changes

The atomic number changes

Protons are given off

The number of neutrons remains the same

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Question 12 / 30

Controlled nuclear chain reactions ___.

Take place in nuclear reactors

Are a, ways fusion reactants

Never produce radioactive by-products

Are characteristic of atomic bombs

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Question 13 / 30

Which of the following statements is correct?

Water is used to moderate neutrons in a nuclear reactor.

Carbon control rods are used to absorb neutrons in a nuclear fission reaction.

A very high temperature is required to initiate a nuclear fission reaction.

The energy released from the sun is the result of a nuclear fission reaction.

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Question 14 / 30

How many moles of silver atoms are in 1. 8x10^20 atoms of silver?

3. 0x10^-4

3. 3x10^-3

3. 0x10^2

1. 1x10^44

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Question 15 / 30

How many atoms are in 3. 5 moles of arsenic atoms?

5. 8x10^-24 atoms

7. 5x10^1 atoms

2. 1x10^24 atoms

1. 7x10^23 atoms

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Question 16 / 30

A molecule with a single covalent bond is ___.

Co2

Cl2

CO

N2

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Question 17 / 30

What is the shape of a molecule with a triple bond?

Tetrahedral

Pyramidal

Metal

Linear

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Question 18 / 30

What is the correct names for the N^3- ion?

Nitrate ion

Nitrogen ion

Nitride ion

Nitrite ion

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Question 19 / 30

Which of the following is true about the composition of ionic compounds?

They are composed of anions and cations.

They are composed of anions only.

They are composed of cations only.

They are formed from two or more nonmetallic elements.

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Question 20 / 30

What type of compound is CuSO4?

Monotomic ionic

Polyatomic covalent

Polyatomic ionic

Binary molecular

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Question 21 / 30

What is the correct formula for a calcium dihydrogen phosphate?

Cah2po4

Ca2h2po4

Ca(h2po4)2

Ca(h2hpo4)2

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Question 22 / 30

Which of the following is NOT a representative particle?

Atom

Cation

Anion

All of the above

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Question 23 / 30

Which combination of temp. and pressure correctly describes standard temp. and pressure, STP?

0 Celcius and 101 kPa

1 Celcius and 0 kPa

0 Celsius and 22. 4 kPa

100 Celsius and 100 kPa

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Question 24 / 30

Which of the following gas samples would have the largest number of representative particles at STP?

12. 0 L He

7. 0 l o2

0. 10 L Xe

0. 007 l so3

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Question 25 / 30

Symbols used in equations, together with the explanations of the symbols, are shown below. Which set is correct?

(g), grams

(l), liters

(aq), dissolved in water

(s), solid product

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Question 26 / 30

Of the following elements, which one has the smallest first ionization energy?

Boron

Carbon

Aluminum

Silicon

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Question 27 / 30

How does calcium obey the octet rule when reacting to form compounds?

It gains electrons.

It gives up electrons.

It does not change its number of electrons.

Calcium does not obey the octet rule.

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Question 28 / 30

Which is a typical characteristic of an ionic compound?

Electron pairs are shared among atoms.

The ionic compound has a low solubility in water.

The ionic compound is described as a molecule.

The ionic compound has a high melting point.

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Question 29 / 30

Which noble gas has the same electron configuration as the oxygen in a water molecule?

Helium

Neon

Argon

Xenon

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Question 30 / 30

What is the approximate frequency of a photon having an energy 5x10^-24 J?

8x10^9 Hz

3x10^-57 Hz

3x10^-58 Hz

1x10^-10 Hz

Quiz Midterm Exam Review 1

The mass of a mole of NaCl is the?

What is the molar mass of (NH4)2CO3?

The volume of one mole of a substance is 22. 4 L at STP for all ___.

What is the number of moles in 9. 63 L of H2S gas at STP?

What is the percent composition of chromium in BaCrO4?

The lowest whole-number ratio of the elements in a compound is called the ___.

A catalyst is ___.

Chemical equations must be balanced to satisfy ___.

Which of the following statements is NOT true about what happens in all chemical reactions?

What is the change in atomic number caused by the emission of gamma radiation?

If an isotope decays by the process of beta emission, ___.

Controlled nuclear chain reactions ___.

Which of the following statements is correct?

How many moles of silver atoms are in 1. 8x10^20 atoms of silver?

How many atoms are in 3. 5 moles of arsenic atoms?

A molecule with a single covalent bond is ___.

What is the shape of a molecule with a triple bond?

What is the correct names for the N^3- ion?

Which of the following is true about the composition of ionic compounds?

What type of compound is CuSO4?

What is the correct formula for a calcium dihydrogen phosphate?

Which of the following is NOT a representative particle?

Which combination of temp. and pressure correctly describes standard temp. and pressure, STP?

Which of the following gas samples would have the largest number of representative particles at STP?

Symbols used in equations, together with the explanations of the symbols, are shown below. Which set is correct?

Of the following elements, which one has the smallest first ionization energy?

How does calcium obey the octet rule when reacting to form compounds?

Which is a typical characteristic of an ionic compound?

Which noble gas has the same electron configuration as the oxygen in a water molecule?

What is the approximate frequency of a photon having an energy 5x10^-24 J?

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