Question 1

Define matter.

Accepted Answer

Matter is anything t

Question 2

How many argon atoms are contained in 7.66 × 105 mmol of argon?

Accepted Answer

A)  4.61 × 1026 Ar atoms 
B)  1.84 × 1028 Ar atoms 
C)  1.15 × 1028 Ar atoms 
D)  7.86 × 1020 Ar atoms 
E)  3.24 × 1026 Ar atoms 
A)  4.61 × 1026 Ar atoms 
B)  1.84 × 1028 Ar atoms 
C)  1.15 × 1028 Ar atoms 
D)  7.86 × 1020 Ar atoms 
E)  3.24 × 1026 Ar atoms

Question 3

Choose the heterogeneous mixture from the list below.

Accepted Answer

A)  sports drink 
B)  chlorine gas 
C)  black coffee 
D)  lasagna 
E)  carbon (graphite) 
A)  sports drink 
B)  chlorine gas 
C)  black coffee 
D)  lasagna 
E)  carbon (graphite)

Question 4

Which of the following represents a valid hypothesis?

Accepted Answer

A)  Neon does not react with oxygen. 
B)  Sodium metal reacts violently with water. 
C)  Lead is soft and malleable. 
D)  Oxygen is a gas at room temperature. 
E)  Metals tend to lose electrons. 
A)  Neon does not react with oxygen. 
B)  Sodium metal reacts violently with water. 
C)  Lead is soft and malleable. 
D)  Oxygen is a gas at room temperature. 
E)  Metals tend to lose electrons.

Question 5

An atom of 26Mg contains ________ neutrons.

Accepted Answer

A)  12 
B)  38 
C)  14 
D)  24 
E)  26 
A)  12 
B)  38 
C)  14 
D)  24 
E)  26

Question 6

Identify the instrument that is used to determine the mass of a molecule.

Accepted Answer

A)  mass spectrometer 
B)  nuclear magnetic resonance spectrometer 
C)  infrared spectrometer 
D)  gas chromatograph 
E)  ultraviolet spectrophotometer 
A)  mass spectrometer 
B)  nuclear magnetic resonance spectrometer 
C)  infrared spectrometer 
D)  gas chromatograph 
E)  ultraviolet spectrophotometer

Question 7

Which of the following contains the most atoms? You shouldn't need to do a calculation here.

Accepted Answer

A)  10.0 g Al 
B)  10.0 g He 
C)  10.0 g Ca 
D)  10.0 g Kr 
E)  10.0 g Cs 
A)  10.0 g Al 
B)  10.0 g He 
C)  10.0 g Ca 
D)  10.0 g Kr 
E)  10.0 g Cs

Question 8

Water is an example of

Accepted Answer

A)  a compound. 
B)  an element. 
C)  a heterogeneous mixture. 
D)  a homogeneous mixture. 
A)  a compound. 
B)  an element. 
C)  a heterogeneous mixture. 
D)  a homogeneous mixture.

Question 9

How many Zn atoms are contained in 922 g of Zn?

Accepted Answer

A)  5.90 × 1025 Zn atoms 
B)  7.09 × 1021 Zn atoms 
C)  8.49 × 1024 Zn atoms 
D)  4.27 × 1022 Zn atoms 
E)  4.18 × 1024 Zn atoms 
A)  5.90 × 1025 Zn atoms 
B)  7.09 × 1021 Zn atoms 
C)  8.49 × 1024 Zn atoms 
D)  4.27 × 1022 Zn atoms 
E)  4.18 × 1024 Zn atoms

Question 10

Give the symbol for silver.

Accepted Answer

A)  S 
B)  Si 
C)  Ar 
D)  Ag 
E)  Sl 
A)  S 
B)  Si 
C)  Ar 
D)  Ag 
E)  Sl

Question 11

Which of the following is an example of the law of multiple proportions?

Accepted Answer

A)  A sample of chlorine is found to contain three times as much Cl-35 as Cl-37. 
B)  Two different compounds formed from carbon and oxygen have the following mass ratios: 1.33 g O: 1 g C and 2.66 g O: 1 g C. 
C)  Two different samples of table salt are found to have the same ratio of sodium to chlorine. 
D)  The atomic mass of bromine is found to be 79.90 amu. 
E)  Nitrogen dioxide always has a mass ratio of 2.28 g O: 1 g N. 
A)  A sample of chlorine is found to contain three times as much Cl-35 as Cl-37. 
B)  Two different compounds formed from carbon and oxygen have the following mass ratios: 1.33 g O: 1 g C and 2.66 g O: 1 g C. 
C)  Two different samples of table salt are found to have the same ratio of sodium to chlorine. 
D)  The atomic mass of bromine is found to be 79.90 amu. 
E)  Nitrogen dioxide always has a mass ratio of 2.28 g O: 1 g N.

Question 12

How many neutrons are in magnesium?

Accepted Answer

A)  12 
B)  13 
C)  14 
D)  12.3 
E)  24.3 
A)  12 
B)  13 
C)  14 
D)  12.3 
E)  24.3

Question 13

What mass (in mg)does 0.04518 moles of silver have?

Accepted Answer

A)  8402 mg 
B)  154.2 mg 
C)  2284 mg 
D)  4874 mg 
E)  843.0 mg 
A)  8402 mg 
B)  154.2 mg 
C)  2284 mg 
D)  4874 mg 
E)  843.0 mg

Question 14

Which of the following statements is FALSE according to Dalton's Atomic Theory?

Accepted Answer

A)  Atoms combine in simple whole number ratios to form compounds. 
B)  All atoms of chlorine have identical properties that distinguish them from other elements. 
C)  One carbon atom will combine with one oxygen atom to form a molecule of carbon monoxide. 
D)  Atoms of sodium do not change into another element during chemical reaction with chlorine. 
E)  An atom of nitrogen can be broken down into smaller particles that will still have the unique properties of nitrogen. 
A)  Atoms combine in simple whole number ratios to form compounds. 
B)  All atoms of chlorine have identical properties that distinguish them from other elements. 
C)  One carbon atom will combine with one oxygen atom to form a molecule of carbon monoxide. 
D)  Atoms of sodium do not change into another element during chemical reaction with chlorine. 
E)  An atom of nitrogen can be broken down into smaller particles that will still have the unique properties of nitrogen.

Question 15

All of the following will lead to a homogeneous mixture EXCEPT

Accepted Answer

A)  sugar and coffee. 
B)  mud and water. 
C)  salt and water. 
D)  ice tea and lemonade. 
E)  vinegar and water. 
A)  sugar and coffee. 
B)  mud and water. 
C)  salt and water. 
D)  ice tea and lemonade. 
E)  vinegar and water.

Question 16

The atomic number is equal to the number of ________.

Accepted Answer

The answer of The atomic number is equal to the...

Question 17

What species is represented by the following information?
P+ = 47 n° = 62 e- = 46

Accepted Answer

A)  Ag+ 
B)  Nd 
C)  Pd 
D)  Ag 
E)  Pd+ 
A)  Ag+ 
B)  Nd 
C)  Pd 
D)  Ag 
E)  Pd+

Question 18

A substance composed of two or more elements in a fixed,definite proportion is

Accepted Answer

A)  a homogeneous mixture. 
B)  a heterogeneous mixture. 
C)  a compound. 
D)  a solution. 
E)  an alloy. 
A)  a homogeneous mixture. 
B)  a heterogeneous mixture. 
C)  a compound. 
D)  a solution. 
E)  an alloy.

Question 19

A new compound was recently discovered and found to have an atomic weight of 342.38 amu.This element has two isotopes,the lighter of which has a mass of 340.91 amu and an abundance of 68.322%.What is the mass of the heavier isotope?

Accepted Answer

A)  350.21 
B)  345.55 
C)  342.38 
D)  348.67 
E)  343.29 
A)  350.21 
B)  345.55 
C)  342.38 
D)  348.67 
E)  343.29

Question 20

What element is defined by the following information?
P+ = 17 n° = 20 e- = 17

Accepted Answer

A)  calcium 
B)  rubidium 
C)  chlorine 
D)  neon 
E)  oxygen 
A)  calcium 
B)  rubidium 
C)  chlorine 
D)  neon 
E)  oxygen

Exam 2: Atoms

Define matter.

How many argon atoms are contained in 7.66 × 105 mmol of argon?

Choose the heterogeneous mixture from the list below.

Which of the following represents a valid hypothesis?

An atom of 26Mg contains ________ neutrons.

Identify the instrument that is used to determine the mass of a molecule.

Which of the following contains the most atoms? You shouldn't need to do a calculation here.

Water is an example of

How many Zn atoms are contained in 922 g of Zn?

Give the symbol for silver.

Which of the following is an example of the law of multiple proportions?

How many neutrons are in magnesium?

What mass (in mg)does 0.04518 moles of silver have?

Which of the following statements is FALSE according to Dalton's Atomic Theory?

All of the following will lead to a homogeneous mixture EXCEPT

The atomic number is equal to the number of ________.

What species is represented by the following information? P+ = 47 n° = 62 e- = 46

A substance composed of two or more elements in a fixed,definite proportion is

A new compound was recently discovered and found to have an atomic weight of 342.38 amu.This element has two isotopes,the lighter of which has a mass of 340.91 amu and an abundance of 68.322%.What is the mass of the heavier isotope?

What element is defined by the following information? P+ = 17 n° = 20 e- = 17

Essentials: Units, Measurements, and Problem Solving

The Quantum Mechanical Model of the Atom

Periodic Properties of the Elements

Molecules and Compounds

Chemical Bonding I

Chemical Bonding Ii

Chemical Reactions and Chemical Quantities

Introduction to Solutions and Aqueous Reactions

Thermochemistry

Gases

Liquids, Solids, and Intermolecular Forces

Crystalline Solids and Modern Materials

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry

Transition Metals and Coordination Compounds

Filters

How many argon atoms are contained in 7.66 × 10⁵ mmol of argon?

An atom of 26_{Mg contains ________ neutrons.}

What species is represented by the following information? P⁺ = 47 n° = 62 e^- = 46

What element is defined by the following information? P⁺ = 17 n° = 20 e^- = 17