Question 1

Choose the pure substance from the list below.

Accepted Answer

A)  coffee 
B)  a casserole 
C)  carbon dioxide 
D)  salt water 
E)  pomegranate juice 
A)  coffee 
B)  a casserole 
C)  carbon dioxide 
D)  salt water 
E)  pomegranate juice

Question 2

How many protons (p)and neutrons (n)are in an atom of strontium-90?

Accepted Answer

A)  38 p, 52 n 
B)  38 p, 90 n 
C)  52 p, 38 n 
D)  90 p, 38 n 
A)  38 p, 52 n 
B)  38 p, 90 n 
C)  52 p, 38 n 
D)  90 p, 38 n

Question 3

Which of the following statements is TRUE?

Accepted Answer

A)  A scientific law is fact. 
B)  Once a theory is constructed, it is considered fact. 
C)  A hypothesis is speculation that is difficult to test. 
D)  An observation explains why nature does something. 
E)  A scientific law summarizes a series of related observations. 
A)  A scientific law is fact. 
B)  Once a theory is constructed, it is considered fact. 
C)  A hypothesis is speculation that is difficult to test. 
D)  An observation explains why nature does something. 
E)  A scientific law summarizes a series of related observations.

Question 4

Identify the characteristics of a gas.

Accepted Answer

A)  definite volume and definite shape 
B)  definite volume and no definite shape 
C)  no definite shape and definite volume 
D)  no definite shape and no definite volume 
A)  definite volume and definite shape 
B)  definite volume and no definite shape 
C)  no definite shape and definite volume 
D)  no definite shape and no definite volume

Question 5

The atomic number (Z)is the number of ________ found in the nucleus of an atom.

Accepted Answer

A)  neutrons 
B)  protons 
C)  protons and neutrons 
D)  electrons 
E)  protons and electrons 
A)  neutrons 
B)  protons 
C)  protons and neutrons 
D)  electrons 
E)  protons and electrons

Question 6

Two or more substances in variable proportions,where the composition is variable throughout are

Accepted Answer

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

Question 7

Silver has an atomic mass of 107.868 amu.The Ag-109 isotope (108.91 amu)is 48.16%.What is the mass,in amu,of the other isotope?

Accepted Answer

A)  106.91 amu 
B)  105.87 amu 
C)  108.47 amu 
D)  106.12 amu 
A)  106.91 amu 
B)  105.87 amu 
C)  108.47 amu 
D)  106.12 amu

Question 8

Dalton's Atomic Theory states

Accepted Answer

A)  that all elements have several isotopes. 
B)  that matter is composed of small indestructible particles. 
C)  that the properties of matter are determined by the properties of atoms. 
D)  that energy is neither created nor destroyed during a chemical reaction. 
E)  that an atom is predominantly empty space. 
A)  that all elements have several isotopes. 
B)  that matter is composed of small indestructible particles. 
C)  that the properties of matter are determined by the properties of atoms. 
D)  that energy is neither created nor destroyed during a chemical reaction. 
E)  that an atom is predominantly empty space.

Question 9

What mass (in kg)does 4.77 moles of nickel have?

Accepted Answer

A)  0.352 kg 
B)  0.122 kg 
C)  0.820 kg 
D)  0.280 kg 
E)  0.632 kg 
A)  0.352 kg 
B)  0.122 kg 
C)  0.820 kg 
D)  0.280 kg 
E)  0.632 kg

Question 10

What mass (in mg)does 2.63 moles of nickel have?

Accepted Answer

A)  44.8 mg 
B)  2.23 × 104 mg 
C)  129 mg 
D)  3.56 × 105 mg 
E)  1.54 × 105 mg 
A)  44.8 mg 
B)  2.23 × 104 mg 
C)  129 mg 
D)  3.56 × 105 mg 
E)  1.54 × 105 mg

Question 11

A substance that can't be chemically broken down into simpler substances is

Accepted Answer

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

Question 12

Choose the homogeneous mixture from the list below.

Accepted Answer

A)  cola float 
B)  air 
C)  concrete 
D)  cereal 
E)  blood 
A)  cola float 
B)  air 
C)  concrete 
D)  cereal 
E)  blood

Question 13

When two elements form two different compounds,the masses of element B that combine with 1 g of element A can be expressed as a ratio of small whole numbers.Which law does this refer to?

Accepted Answer

A)  Law of Definite Proportions 
B)  Law of the Conservation of Mass 
C)  Law of Modern Atomic Theory 
D)  Law of Multiple Proportions 
E)  First Law of Thermodynamics 
A)  Law of Definite Proportions 
B)  Law of the Conservation of Mass 
C)  Law of Modern Atomic Theory 
D)  Law of Multiple Proportions 
E)  First Law of Thermodynamics

Question 14

How many phosphorus atoms are contained in 158 kg of phosphorus?

Accepted Answer

A)  3.07 × 1027 phosphorus atoms 
B)  2.95 × 1027 phosphorus atoms 
C)  3.25 × 1028 phosphorus atoms 
D)  1.18 × 1024 phosphorus atoms 
E)  8.47 × 1024 phosphorus atoms 
A)  3.07 × 1027 phosphorus atoms 
B)  2.95 × 1027 phosphorus atoms 
C)  3.25 × 1028 phosphorus atoms 
D)  1.18 × 1024 phosphorus atoms 
E)  8.47 × 1024 phosphorus atoms

Question 15

Choose the homogeneous mixture from the list below.

Accepted Answer

A)  wine 
B)  mud 
C)  ice water 
D)  salad 
E)  salsa 
A)  wine 
B)  mud 
C)  ice water 
D)  salad 
E)  salsa

Question 16

An ion has 12 protons,14 neutrons,and 10 electrons.The symbol for the ion is

Accepted Answer

A)  26Mg2+  
B)  26Mg2-  
C)  24Si2+  
D)  24Si2-  
E)  26Ne2-  
A)  26Mg2+  
B)  26Mg2-  
C)  24Si2+  
D)  24Si2-  
E)  26Ne2-

Question 17

Calculate the atomic mass of gallium if gallium has 2 naturally occurring isotopes with the following masses and natural abundances. Ga-69 68.9256 amu 60.11%
Ga-71 70.9247 amu 39.89%

Accepted Answer

A)  69.72 amu 
B)  69.93 amu 
C)  70.00 amu 
D)  69.80 amu 
E)  70.68 amu 
A)  69.72 amu 
B)  69.93 amu 
C)  70.00 amu 
D)  69.80 amu 
E)  70.68 amu

Question 18

How many protons (p)and neutrons (n)are in an atom of   Tc?

Accepted Answer

A)  43 p, 55 n 
B)  43 p, 98 n 
C)  55 p, 43 n 
D)  98 p, 43 n 
A)  43 p, 55 n 
B)  43 p, 98 n 
C)  55 p, 43 n 
D)  98 p, 43 n

Question 19

How many protons are in krypton?

Accepted Answer

A)  35 
B)  36 
C)  37 
D)  83.8 
E)  88.3 
A)  35 
B)  36 
C)  37 
D)  83.8 
E)  88.3

Question 20

What species is represented by the following information?
P+ = 12 n° = 14 e- = 10

Accepted Answer

A)  Si4+ 
B)  Mg 
C)  Ne 
D)  Si 
E)  Mg2+ 
A)  Si4+ 
B)  Mg 
C)  Ne 
D)  Si 
E)  Mg2+

Exam 2: Atoms

Choose the pure substance from the list below.

How many protons (p)and neutrons (n)are in an atom of strontium-90?

Which of the following statements is TRUE?

Identify the characteristics of a gas.

The atomic number (Z)is the number of ________ found in the nucleus of an atom.

Two or more substances in variable proportions,where the composition is variable throughout are

Silver has an atomic mass of 107.868 amu.The Ag-109 isotope (108.91 amu)is 48.16%.What is the mass,in amu,of the other isotope?

Dalton's Atomic Theory states

What mass (in kg)does 4.77 moles of nickel have?

What mass (in mg)does 2.63 moles of nickel have?

A substance that can't be chemically broken down into simpler substances is

Choose the homogeneous mixture from the list below.

When two elements form two different compounds,the masses of element B that combine with 1 g of element A can be expressed as a ratio of small whole numbers.Which law does this refer to?

How many phosphorus atoms are contained in 158 kg of phosphorus?

Choose the homogeneous mixture from the list below.

An ion has 12 protons,14 neutrons,and 10 electrons.The symbol for the ion is

Calculate the atomic mass of gallium if gallium has 2 naturally occurring isotopes with the following masses and natural abundances. Ga-69 68.9256 amu 60.11% Ga-71 70.9247 amu 39.89%

How many protons (p)and neutrons (n)are in an atom of Tc?

How many protons are in krypton?

What species is represented by the following information? P+ = 12 n° = 14 e- = 10

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

An ion has 12 protons,^{14 neutrons,and 10 electrons.The symbol for the ion is}

What species is represented by the following information? P⁺ = 12 n° = 14 e^- = 10