Question 1

Choose the homogeneous mixture from the list below.

Accepted Answer

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

Question 2

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.

Question 3

Choose the pure substance from the list below.

Accepted Answer

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

Question 4

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

Question 5

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

Question 6

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

Question 7

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.

Question 8

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-

Question 9

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

Question 10

How many protons are in krypton?

Accepted Answer

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

Question 11

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

Question 12

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

Question 13

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.

Question 14

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

Question 15

Choose the homogeneous mixture from the list below.

Accepted Answer

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

Question 16

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.

Question 17

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

Question 18

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+

Question 19

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

Question 20

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

Exam 2: Atoms

Choose the homogeneous mixture from the list below.

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

Correct AnswerverifiedShow Answer

Identify the characteristics of a gas.

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Which of the following statements is TRUE?

Correct AnswerverifiedShow Answer

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

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

Dalton's Atomic Theory states

Correct AnswerverifiedShow Answer

Choose the pure substance from the list below.

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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%

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

How many protons are in krypton?

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

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Choose the homogeneous mixture from the list below.

Correct AnswerverifiedShow Answer

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

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

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