Question 1

What element contains 15 neutrons and 14 protons?

Accepted Answer

A) Phosphorus 
B) Silicon 
C) Copper 
D) Zinc 
A) Phosphorus 
B) Silicon 
C) Copper 
D) Zinc B

Question 2

Which element has the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d11 4p4?

Accepted Answer

A) Selenium 
B) Zinc 
C) Arsenic 
D) None; the configuration is incorrect for any element. 
A) Selenium 
B) Zinc 
C) Arsenic 
D) None; the configuration is incorrect for any element. D

Question 3

What is the maximum number of electrons that can be contained in an orbital?

Accepted Answer

2

Question 4

Magnesium most likely has which isotope in the highest percentage?

Accepted Answer

A) Magnesium-23 
B) Magnesium-24 
C) Magnesium-25 
D) Magnesium-26 
A) Magnesium-23 
B) Magnesium-24 
C) Magnesium-25 
D) Magnesium-26

Question 5

If 8.0 g of hydrofluoric acid reacts with 16.0 g of sodium hydroxide, producing 16.8 g of sodium fluoride, how much water is also produced?

Accepted Answer

A) 16.0 g 
B) 24.0 g 
C) 7.2 g 
D) 0.8 g 
A) 16.0 g 
B) 24.0 g 
C) 7.2 g 
D) 0.8 g

Question 6

When an element has Z=1 and no neutrons, what element and isotope is this?

Accepted Answer

A)  ${ }_{0}^{1} \mathrm{H}$ 
B)  ${ }_{1}^{1} \mathrm{H}$ 
C)  ${ }_{1}^{0} \mathrm{H}$ 
D)  ${ }_{1}^{2} \mathrm{H}$ 
A)  ${ }_{0}^{1} \mathrm{H}$ 
B)  ${ }_{1}^{1} \mathrm{H}$ 
C)  ${ }_{1}^{0} \mathrm{H}$ 
D)  ${ }_{1}^{2} \mathrm{H}$

Question 7

What is the shape of a p orbital?

Accepted Answer

The answer of What is the shape of a p...

Question 8

Why does mass appear to be lost in a reaction involving burning in an open system?

Accepted Answer

A) Matter escapes as a gas. 
B) Matter as ashes is smaller than the starting material. 
C) Matter is made less dense in the burning process. 
D) Burning causes the loss of matter. 
A) Matter escapes as a gas. 
B) Matter as ashes is smaller than the starting material. 
C) Matter is made less dense in the burning process. 
D) Burning causes the loss of matter.

Question 9

What is different about the ancient water trapped in Arctic and Antarctic ice?

Accepted Answer

It is isotopically d

Question 10

What kind of distinction does a continuous spectrum have between colors?

Accepted Answer

The answer of What kind of distinction does a continuous...

Question 11

How many d orbitals are there?

Accepted Answer

A) 1 
B) 3 
C) 5 
D) 7 
A) 1 
B) 3 
C) 5 
D) 7

Question 12

An electron that has been pushed into a higher energy level is said to be in what state?

Accepted Answer

A) An excited state 
B) An exited state 
C) The ground state 
D) The photonic state 
A) An excited state 
B) An exited state 
C) The ground state 
D) The photonic state

Question 13

The wavelength of a certain emitted light is 1.36 × 1015 s-1. What is its wavelength, in nanometers?

Accepted Answer

A) 136.0 nm 
B) 300.0 nm 
C) 220.4 nm 
D) 22.04 nm 
A) 136.0 nm 
B) 300.0 nm 
C) 220.4 nm 
D) 22.04 nm

Question 14

How many different shaped d orbitals are there?

Accepted Answer

A) 1 
B) 2 
C) 5 
D) 7 
A) 1 
B) 2 
C) 5 
D) 7

Question 15

If light has a frequency of 6 × 104 /s, what is its wavelength?

Accepted Answer

A) 2.0 × 104 m 
B) 0.50 × 1012 m 
C) 0.50 × 104 m 
D) 2.0 × 1012 m 
A) 2.0 × 104 m 
B) 0.50 × 1012 m 
C) 0.50 × 104 m 
D) 2.0 × 1012 m

Question 16

Atoms of Ca contain how many protons?

Accepted Answer

A) 19 
B) 40 
C) 20 
D) 41 
A) 19 
B) 40 
C) 20 
D) 41

Question 17

When an element has Z=26 and 29 neutrons, what element and isotope is this?

Accepted Answer

A)  ${ }_{29}^{26} \mathrm{Cu}$ 
B)  ${ }_{29}^{55} \mathrm{Cu}$ 
C)  ${ }_{26}^{29} \mathrm{Fe}$ 
D)  ${ }_{26}^{55} \mathrm{Fe}$ 
A)  ${ }_{29}^{26} \mathrm{Cu}$ 
B)  ${ }_{29}^{55} \mathrm{Cu}$ 
C)  ${ }_{26}^{29} \mathrm{Fe}$ 
D)  ${ }_{26}^{55} \mathrm{Fe}$

Question 18

The compounds NO and NO2 represent which of the postulates of Dalton's atomic theory?

Accepted Answer

A) All atoms of a given element are equal. 
B) Atoms combine in simple, whole number ratios to form compounds. 
C) Matter is made up of tiny, indivisible particles. 
D) Atoms cannot be created or destroyed in a chemical reaction. 
A) All atoms of a given element are equal. 
B) Atoms combine in simple, whole number ratios to form compounds. 
C) Matter is made up of tiny, indivisible particles. 
D) Atoms cannot be created or destroyed in a chemical reaction.

Question 19

What is the orbital of an electron?

Accepted Answer

A) A loop-like planetary trajectory with the lowest probability of finding the electron 
B) A loop-like planetary trajectory with the highest probability of finding the electron 
C) The region of space with the lowest probability of finding the electron 
D) The region of space with the highest probability of finding the electron 
A) A loop-like planetary trajectory with the lowest probability of finding the electron 
B) A loop-like planetary trajectory with the highest probability of finding the electron 
C) The region of space with the lowest probability of finding the electron 
D) The region of space with the highest probability of finding the electron

Question 20

If the atomic mass of boron is 10.81, which isotope of boron is most likely the major one?

Accepted Answer

A) 11 
B) 10 
C) 12 
D) 9 
A) 11 
B) 10 
C) 12 
D) 9

What element contains 15 neutrons and 14 protons?

Which element has the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹¹ 4p⁴?

What is the maximum number of electrons that can be contained in an orbital?

Magnesium most likely has which isotope in the highest percentage?

If 8.0 g of hydrofluoric acid reacts with 16.0 g of sodium hydroxide, producing 16.8 g of sodium fluoride, how much water is also produced?

When an element has Z=1 and no neutrons, what element and isotope is this?

What is the shape of a p orbital?

Why does mass appear to be lost in a reaction involving burning in an open system?

What is different about the ancient water trapped in Arctic and Antarctic ice?

What kind of distinction does a continuous spectrum have between colors?

How many d orbitals are there?

An electron that has been pushed into a higher energy level is said to be in what state?

The wavelength of a certain emitted light is 1.36 × 10¹⁵ s^-1. What is its wavelength, in nanometers?

How many different shaped d orbitals are there?

If light has a frequency of 6 × 10⁴ /s, what is its wavelength?

Atoms of Ca contain how many protons?

When an element has Z=26 and 29 neutrons, what element and isotope is this?

The compounds NO and NO₂ represent which of the postulates of Dalton's atomic theory?

What is the orbital of an electron?

If the atomic mass of boron is 10.81, which isotope of boron is most likely the major one?

Understanding Our World With Chemistry

Matter: Properties, Changes and Measurements

Bonding and Reactions

Chemistry of Bonding: Structure and Function of Drug Molecules

Aqueous Solutions: Part I

Aqueous Solutions: Part II

Organic Chemistry and Polymers

Chemistry of Fire and Heat

Chemistry of Explosions

Applications of Chemical Kinetics

Nuclear Chemistry: Energy, Medicine, Weapons, and Terrorism

Chemical Equilibrium

Introduction to Biochemistry

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Exam 3: Understanding Atoms

What element contains 15 neutrons and 14 protons?

Which element has the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d11 4p4?

What is the maximum number of electrons that can be contained in an orbital?

Magnesium most likely has which isotope in the highest percentage?

If 8.0 g of hydrofluoric acid reacts with 16.0 g of sodium hydroxide, producing 16.8 g of sodium fluoride, how much water is also produced?

When an element has Z=1 and no neutrons, what element and isotope is this?

What is the shape of a p orbital?

Why does mass appear to be lost in a reaction involving burning in an open system?

What is different about the ancient water trapped in Arctic and Antarctic ice?

What kind of distinction does a continuous spectrum have between colors?

How many d orbitals are there?

An electron that has been pushed into a higher energy level is said to be in what state?

The wavelength of a certain emitted light is 1.36 × 1015 s-1. What is its wavelength, in nanometers?

How many different shaped d orbitals are there?

If light has a frequency of 6 × 104 /s, what is its wavelength?

Atoms of Ca contain how many protons?

When an element has Z=26 and 29 neutrons, what element and isotope is this?

The compounds NO and NO2 represent which of the postulates of Dalton's atomic theory?

What is the orbital of an electron?

If the atomic mass of boron is 10.81, which isotope of boron is most likely the major one?

Understanding Our World With Chemistry

Matter: Properties, Changes and Measurements

Bonding and Reactions

Chemistry of Bonding: Structure and Function of Drug Molecules

Aqueous Solutions: Part I

Aqueous Solutions: Part II

Organic Chemistry and Polymers

Chemistry of Fire and Heat

Chemistry of Explosions

Applications of Chemical Kinetics

Nuclear Chemistry: Energy, Medicine, Weapons, and Terrorism

Chemical Equilibrium

Introduction to Biochemistry

Filters

Which element has the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹¹ 4p⁴?

The wavelength of a certain emitted light is 1.36 × 10¹⁵ s^-1. What is its wavelength, in nanometers?

If light has a frequency of 6 × 10⁴ /s, what is its wavelength?

The compounds NO and NO₂ represent which of the postulates of Dalton's atomic theory?