Question 1

Figure 2.8
-How many grams would be equal to 1 mol of the compound shown in Figure 2.8?
(carbon = 12,oxygen = 16,hydrogen = 1)

Accepted Answer

A)  29
B)  30
C)  60
D)  150
E)  342F) B) and E)
G) A) and C)

Question 2

One mole (mol) of glucose (molecular mass = 180 daltons) is

Accepted Answer

A)  180 × 1023 molecules of glucose.
B)  1 kg of glucose dissolved in 1 L of solution.
C)  the largest amount of glucose that can be dissolved in 1 L of solution.
D)  180 grams of glucose.
E)  180 grams of glucose dissolved in 1 L of solution.F) A) and B)
G) A) and C)

Question 3

How many electron pairs are shared between the two carbon atoms in a molecule that has the formula C2H6?

Accepted Answer

A)  0
B)  1
C)  2
D)  3
E)  4F) A) and E)
G) A) and C)

Question 4

Increased atmospheric CO2 concentrations will have what effect on seawater?

Accepted Answer

A)  Seawater will become more acidic,and bicarbonate concentrations will decrease.
B)  Seawater will become more alkaline,and carbonate concentrations will decrease.
C)  There will be no change in the pH of seawater because carbonate will turn to bicarbonate.
D)  Seawater will become more acidic,and carbonate concentrations will decrease.E) A) and D)
F) None of the above

Question 5

How many glucose molecules are contained in one liter of a 0.1 M solution of glucose in water?

Accepted Answer

A)  6) 02 × 1023
B)  3) 01 × 1023
C)  6) 02 × 1024
D)  12.04 × 1023
E)  6) 02 × 1022F) A) and E)
G) All of the above

Question 6

If acid rain has lowered the pH of a particular lake to pH 4.0,which of the following statements about this lake is true?

Accepted Answer

A)  The hydrogen ion concentration is 1 × 10-10 moles per liter of lake water.
B)  The hydrogen ion concentration is 4.0 moles per liter of lake water.
C)  The hydrogen ion concentration is 1 × 104 moles per liter of lake water.
D)  The hydroxyl ion concentration is 1 × 10-10 moles per liter of lake water.
E)  The hydroxyl ion concentration is 1 × 10-4 moles per liter of lake water.F) B) and D)
G) B) and E)

Question 7

A beaker contains 100 mL of NaOH solution at pH = 13.A technician carefully pours into the beaker 10 mL of HCl at pH = 1.Which of the following statements correctly describes the results of this mixing?

Accepted Answer

A)  The concentration of Na+ ion will rise.
B)  The concentration of Cl- ion will be 0.1 M.
C)  The concentration of undissociated H2O molecules will remain unchanged.
D)  The pH of the beaker's contents will be neutral.
E)  The pH of the beaker's contents will decrease.F) D) and E)
G) A) and B)

Question 8

Why does ice float in liquid water?

Accepted Answer

A)  The high surface tension of liquid water keeps the ice on top.
B)  The ionic bonds between the molecules in ice prevent the ice from sinking.
C)  Ice always has air bubbles that keep it afloat.
D)  Hydrogen bonds stabilize and keep the water molecules of ice farther apart than the water molecules of liquid water.
E)  The crystalline lattice of ice causes it to be denser than liquid water.F) A) and D)
G) B) and C)

Question 9

Which of the atoms shown would be most likely to form a cation with a charge of +1?

Accepted Answer

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

Question 10

The molar mass of glucose is 180 g/mol.Which of the following procedures should you carry out to make a 1 M solution of glucose?

Accepted Answer

A)  Dissolve 1 g of glucose in 1 L of water.
B)  Dissolve 180 g of glucose in 1 L of water.
C)  Dissolve 180 g of glucose in 180 g of water.
D)  Dissolve 180 milligrams (mg) of glucose in 1 L of water.
E)  Dissolve 180 g of glucose in 0.8 L of water,and then add more water until the total volume of the solution is 1 L.F) A) and E)
G) A) and D)

Question 11

How many molecules of glycerol (C3H8O3;molecular mass = 92) are present in 0.5 L of a 1 M glycerol solution?

Accepted Answer

A)  1 × 1023
B)  0) 5 × 6.02 × 1023
C)  92/2 × 6.02 × 1023
D)  0) 5 × 6.02/92 × 1023
E)  6) 02 × 1023F) A) and E)
G) B) and C)

Question 12

Which of the following correctly describes any reaction that has reached chemical equilibrium?

Accepted Answer

A)  The concentration of the reactants equals the concentration of the products.
B)  The rate of the forward reaction is equal to the rate of the reverse reaction.
C)  All of the reactants have been converted to the products of the reaction.
D)  All of the products have been converted to the reactants of the reaction.E) A) and C)
F) B) and C)

Question 13

Measurements show that the pH of a particular lake is 4.0.What is the hydrogen ion concentration of the lake?

Accepted Answer

A)  4.0 M
B)  10−4 M
C)  104 M
D)  10−10 ME) A) and C)
F) All of the above

Question 14

Figure 2.6
-What is the atomic number of the cation formed in the reaction illustrated in Figure 2.6?

Accepted Answer

A)  1
B)  8
C)  10
D)  11
E)  16F) C) and D)
G) A) and B)

Question 15

Glucose has a molecular mass of 180 g/mol.How many glucose molecules are present in 100 grams of glucose?

Accepted Answer

A)  100 × 1023
B)  (6.02/180) × 1023
C)  (6.02/100) × 1023
D)  (100 × 6.02) × 1023
E)  (100/180) × 6.02 × 1023F) None of the above
G) A) and E)

Question 16

The left-to-right position of an element in the first three rows of the periodic table indicates which of the following properties of the element?

Accepted Answer

A)  the total number of electrons in the element
B)  the total number of protons in the element
C)  the total number of neutrons in the element
D)  the number of electron orbitals in the element
E)  the number of electrons in the valence shellF) A) and E)
G) A) and B)

Question 17

Figure 2.5
Figure 2.5 shows a representation of formic acid.A formic acid molecule

Accepted Answer

A)  will dissociate in water,thus increasing the pH.
B)  will dissociate in water,thus decreasing the pH.
C)  contains primarily nonpolar covalent bonds.
D)  has a tetrahedral shape.E) A) and B)
F) All of the above

Question 18

If a salamander clings to surfaces through hydrogen bonds,it would have the most difficulty clinging to which of the following surfaces?

Accepted Answer

A)  a surface coated with a thin film of water
B)  a surface coated with a thin film of vinegar (acetic acid) 
C)  a surface coated with a thin film of vegetable oil
D)  a surface coated with a thin film of ammonia (NH3) E) All of the above
F) B) and C)

Question 19

The attraction between the slight negative charge of one water molecule to the slight positive charge of another water molecule results in which of the following interactions?

Accepted Answer

A)  a covalent bond
B)  a hydrogen bond
C)  an ionic bond
D)  a hydrophilic bond
E)  a van der Waals interactionF) B) and E)
G) A) and B)

Question 20

One liter of a solution of pH 8 has how many more hydroxyl ions (OH-) than 1 L of a solution of pH 4?

Accepted Answer

A)  5 times more
B)  32 times more
C)  50,000 times more
D)  10,000 times more
E)  100,000 times moreF) A) and C)
G) A) and B)

Exam 2: The Chemical Context of Life

Figure 2.8 -How many grams would be equal to 1 mol of the compound shown in Figure 2.8? (carbon = 12,oxygen = 16,hydrogen = 1)

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Figure 2.5 Figure 2.5 shows a representation of formic acid.A formic acid molecule

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If a salamander clings to surfaces through hydrogen bonds,it would have the most difficulty clinging to which of the following surfaces?

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Figure 2.6 -What is the atomic number of the cation formed in the reaction illustrated in Figure 2.6?

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Glucose has a molecular mass of 180 g/mol.How many glucose molecules are present in 100 grams of glucose?

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Measurements show that the pH of a particular lake is 4.0.What is the hydrogen ion concentration of the lake?

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How many electron pairs are shared between the two carbon atoms in a molecule that has the formula C2H6?

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One liter of a solution of pH 8 has how many more hydroxyl ions (OH-) than 1 L of a solution of pH 4?

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How many molecules of glycerol (C3H8O3;molecular mass = 92) are present in 0.5 L of a 1 M glycerol solution?

Correct AnswerverifiedShow Answer

The left-to-right position of an element in the first three rows of the periodic table indicates which of the following properties of the element?

Correct AnswerverifiedShow Answer

Increased atmospheric CO2 concentrations will have what effect on seawater?

Correct AnswerverifiedShow Answer

If acid rain has lowered the pH of a particular lake to pH 4.0,which of the following statements about this lake is true?

Correct AnswerverifiedShow Answer

One mole (mol) of glucose (molecular mass = 180 daltons) is

Correct AnswerverifiedShow Answer

Which of the following correctly describes any reaction that has reached chemical equilibrium?

Correct AnswerverifiedShow Answer

The molar mass of glucose is 180 g/mol.Which of the following procedures should you carry out to make a 1 M solution of glucose?

Correct AnswerverifiedShow Answer

Which of the atoms shown would be most likely to form a cation with a charge of +1?

Correct AnswerverifiedShow Answer

A beaker contains 100 mL of NaOH solution at pH = 13.A technician carefully pours into the beaker 10 mL of HCl at pH = 1.Which of the following statements correctly describes the results of this mixing?

Correct AnswerverifiedShow Answer

How many glucose molecules are contained in one liter of a 0.1 M solution of glucose in water?

Correct AnswerverifiedShow Answer

Why does ice float in liquid water?

Correct AnswerverifiedShow Answer

The attraction between the slight negative charge of one water molecule to the slight positive charge of another water molecule results in which of the following interactions?

Correct AnswerverifiedShow Answer

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How many electron pairs are shared between the two carbon atoms in a molecule that has the formula C₂H₆?

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One liter of a solution of pH 8 has how many more hydroxyl ions (OH^-) than 1 L of a solution of pH 4?

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How many molecules of glycerol (C₃H₈O_3;molecular mass = 92) are present in 0.5 L of a 1 M glycerol solution?

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Increased atmospheric CO₂ concentrations will have what effect on seawater?

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