Question 1

KH2PO4 is

Accepted Answer

A)  hydropotassium phosphate.
B)  potassium dihydrogen phosphate.
C)  potassium diphosphate.
D)  potassium hydrogen(II) phosphate.E) A) and B)
F) A) and C)

Question 2

Which subatomic particle has the smallest mass?

Accepted Answer

A)  a proton
B)  a neutron
C)  an electron
D)  an alpha particleE) B) and D)
F) A) and B)

Question 3

In the following drawings,shaded spheres represent cations and unshaded spheres represent anions. 2? A) drawing (a)  B) drawing (b)  C) drawing (c)  D) drawing (d) " class="answers-bank-image d-inline" rel="preload" >
-Which drawing represents the ionic compound CaCl2?

Accepted Answer

A)  drawing (a) 
B)  drawing (b) 
C)  drawing (c) 
D)  drawing (d) E) B) and C)
F) A) and B)

Question 4

If shaded and unshaded spheres represent atoms of different elements,as shown in drawing (1) ,which drawings (2) -(4) represent the law of multiple proportions?

Accepted Answer

A)  only drawings (2) and (3) 
B)  only drawings (2) and (4) 
C)  only drawings (3) and (4) 
D)  drawings (2) ,(3) ,and (4) E) None of the above
F) B) and C)

Question 5

A sample of pure lithium carbonate contains 18.8% lithium by mass.What is the % lithium by mass in a sample of pure lithium carbonate that has twice the mass of the first sample?

Accepted Answer

A)  9) 40%
B)  18.8%
C)  37.6%
D)  75.2%E) A) and B)
F) All of the above B

Question 6

What is the chemical formula for magnesium hydride?

Accepted Answer

A)  MgH2
B)  MgOH
C)  MgOH2
D)  Mg(OH) 2E) A) and B)
F) A) and C)

Question 7

What is the identity of element Q if the ion Q2+ contains 10 electrons?

Accepted Answer

A)  C
B)  O
C)  Ne
D)  MgE) B) and C)
F) A) and C)

Question 8

A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium.How much calcium is contained in 40.0 g of calcium fluoride?

Accepted Answer

A)  2) 27 g
B)  7) 70 g
C)  15.0 g
D)  20.5 gE) A) and D)
F) All of the above

Question 9

Methane and oxygen react to form carbon dioxide and water.What mass of water is formed if 3.2 g of methane reacts with 12.8 g of oxygen to produce 8.8 g of carbon dioxide?

Accepted Answer

A)  7) 2 g
B)  8) 8 g
C)  14.8 g
D)  16.0 gE) B) and D)
F) A) and B)

Question 10

-If shaded and unshaded spheres represent atoms of different elements,which of the above drawings most likely represents an ionic compound at room temperature and a pressure of 1 atm?

Accepted Answer

A)  drawing (a) 
B)  drawing (b) 
C)  drawing (c) 
D)  drawing (d) E) B) and C)
F) A) and D)

Question 11

Apple juice is an example of

Accepted Answer

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

Question 12

Which of the following statements about gamma radiation is false?

Accepted Answer

A)  It almost always accompanies alpha or beta emission.
B)  It is a mechanism to release excess energy in the nucleus.
C)  Gamma rays are high energy photons.
D)  The mass number decreases by one with each gamma emitted.E) None of the above
F) C) and D)

Question 13

Use the periodic table below to answer the following questions. 2 B) AF3 C) AF5 D) AF6" class="answers-bank-image d-inline" rel="preload" >
-Which is the correct formula of the binary fluoride of element A?

Accepted Answer

A)  AF2
B)  AF3
C)  AF5
D)  AF6E) C) and D)
F) A) and B)

Question 14

In addition to a beta particle,what is the other product of beta decay of 
?

Accepted Answer

A)   
B)   
C)   
D)   E) A) and B)
F) C) and D)

Question 15

Which of the following is a part of Dalton's atomic theory?

Accepted Answer

A)  Atoms are rearranged but not changed during a chemical reaction.
B)  Atoms break down during radioactive decay.
C)  Atoms contain protons,neutrons,and electrons.
D)  Isotopes of the same element have different masses.E) All of the above
F) B) and C)

Question 16

Use the periodic table below to answer the following questions. 
-Which elements commonly form anions?

Accepted Answer

A)  A and B
B)  A and C
C)  B and D
D)  C and DE) B) and D)
F) B) and C)

Question 17

Which element can form more than one kind of monatomic ion?

Accepted Answer

A)  Ca
B)  Cl
C)  Cr
D)  CsE) A) and B)
F) A) and C) C

Question 18

A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium.How much calcium is contained in 45.0 g of calcium fluoride?

Accepted Answer

A)  2) 56 g
B)  7) 70 g
C)  15.0 g
D)  23.1 gE) A) and D)
F) A) and C)

Question 19

Gold is an example of

Accepted Answer

A)  a compound.
B)  an element.
C)  a heterogeneous mixture.
D)  a homogeneous mixture.E) A) and D)
F) None of the above

Question 20

The observation that hydrogen and oxygen can react to form two compounds with different chemical and physical properties,one having an O:H mass ratio = 8:1 and the other having an O:H mass ratio = 16:1 is consistent with the law of

Accepted Answer

A)  definite proportions.
B)  energy conservation.
C)  mass conservation.
D)  multiple proportions.E) A) and C)
F) A) and B)

Exam 2: Atoms, molecules, and Ions

KH2PO4 is

Correct AnswerverifiedShow Answer

Which subatomic particle has the smallest mass?

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In the following drawings,shaded spheres represent cations and unshaded spheres represent anions. -Which drawing represents the ionic compound CaCl2?

Correct AnswerverifiedShow Answer

If shaded and unshaded spheres represent atoms of different elements,as shown in drawing (1) ,which drawings (2) -(4) represent the law of multiple proportions?

Correct AnswerverifiedShow Answer

A sample of pure lithium carbonate contains 18.8% lithium by mass.What is the % lithium by mass in a sample of pure lithium carbonate that has twice the mass of the first sample?

Correct AnswerverifiedB

What is the chemical formula for magnesium hydride?

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What is the identity of element Q if the ion Q2+ contains 10 electrons?

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A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium.How much calcium is contained in 40.0 g of calcium fluoride?

Correct AnswerverifiedShow Answer

Methane and oxygen react to form carbon dioxide and water.What mass of water is formed if 3.2 g of methane reacts with 12.8 g of oxygen to produce 8.8 g of carbon dioxide?

Correct AnswerverifiedShow Answer

-If shaded and unshaded spheres represent atoms of different elements,which of the above drawings most likely represents an ionic compound at room temperature and a pressure of 1 atm?

Correct AnswerverifiedShow Answer

Apple juice is an example of

Correct AnswerverifiedD

Which of the following statements about gamma radiation is false?

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Use the periodic table below to answer the following questions. -Which is the correct formula of the binary fluoride of element A?

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In addition to a beta particle,what is the other product of beta decay of ?

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Which of the following is a part of Dalton's atomic theory?

Correct AnswerverifiedShow Answer

Use the periodic table below to answer the following questions. -Which elements commonly form anions?

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Which element can form more than one kind of monatomic ion?

Correct AnswerverifiedC

A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium.How much calcium is contained in 45.0 g of calcium fluoride?

Correct AnswerverifiedShow Answer

Gold is an example of

Correct AnswerverifiedShow Answer

The observation that hydrogen and oxygen can react to form two compounds with different chemical and physical properties,one having an O:H mass ratio = 8:1 and the other having an O:H mass ratio = 16:1 is consistent with the law of

Correct AnswerverifiedShow Answer

KH₂PO₄ is

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In the following drawings,shaded spheres represent cations and unshaded spheres represent anions. -Which drawing represents the ionic compound CaCl₂?

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B

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What is the identity of element Q if the ion Q²⁺ contains 10 electrons?

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D

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C

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