Chapter 15
Chemical Compounds
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Chapter 15
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1. What kind of carbon backbone does the figure
represent?
A an alkyne chain
B a ring chain
C a branched chain
D a straight chain
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1. What kind of carbon backbone does the figure
represent?
A an alkyne chain
B a ring chain
C a branched chain
D a straight chain
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Chapter 15
CRCT Preparation
2. Antacids usually contain bases. Which of the
following best describes the reaction between antacids
and stomach acid?
A A neutralization reaction occurs, producing neutral
compounds.
B The products formed are more acidic than stomach
acid.
C The antacid becomes bright red in the presence of
stomach acid.
D The products formed contain different elements than
those contained in antacid and stomach acid.
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Chapter 15
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2. Antacids usually contain bases. Which of the
following best describes the reaction between antacids
and stomach acid?
A A neutralization reaction occurs, producing neutral
compounds.
B The products formed are more acidic than stomach
acid.
C The antacid becomes bright red in the presence of
stomach acid.
D The products formed contain different elements than
those contained in antacid and stomach acid.
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Chapter 15
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3. Which of the following substances is a lipid?
A glucose
B carbohydrate
C fat
D protein
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Chapter 15
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3. Which of the following substances is a lipid?
A glucose
B carbohydrate
C fat
D protein
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4. A compound dissolved in water turns red litmus
paper blue and changes the indicator bromthymol blue
to dark blue. What kind of compound is it?
A an acid
B a base
C lemon juice
D table salt
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4. A compound dissolved in water turns red litmus
paper blue and changes the indicator bromthymol blue
to dark blue. What kind of compound is it?
A an acid
B a base
C lemon juice
D table salt
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5. A salt solution conducts an electric current, but a
sugar solution does not. Which of the following
statements best describes why a sugar solution does
not conduct an electric current?
A Sugar molecules are held together by ionic bonds.
B Covalent compounds cannot conduct electric
currents.
C Sugar molecules form ions in water.
D Sugar molecules are not charged.
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5. A salt solution conducts an electric current, but a
sugar solution does not. Which of the following
statements best describes why a sugar solution does
not conduct an electric current?
A Sugar molecules are held together by ionic bonds.
B Covalent compounds cannot conduct electric
currents.
C Sugar molecules form ions in water.
D Sugar molecules are not charged.
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6. The pH of some common household substances is
listed in the table. Which substance would most likely
feel slippery?
A lemon juice
B vinegar
C milk
D ammonia
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6. The pH of some common household substances is
listed in the table. Which substance would most likely
feel slippery?
A lemon juice
B vinegar
C milk
D ammonia
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7. What factor does the pH scale measure?
A the concentration of sodium ions in
a solution
B the concentration of hydroxide ions in
a solution
C the concentration of glycogen ions in
a solution
D the concentration of hydronium ions in a solution
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7. What factor does the pH scale measure?
A the concentration of sodium ions in
a solution
B the concentration of hydroxide ions in
a solution
C the concentration of glycogen ions in
a solution
D the concentration of hydronium ions in a solution
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8. All organic compounds are based on which element?
A hydrogen
B carbon
C oxygen
D nitrogen
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8. All organic compounds are based on which element?
A hydrogen
B carbon
C oxygen
D nitrogen
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9. A chemist is identifying an unknown white solid.
The sample consists of a single compound. The first
step in the identification process involves deciding if
the compound is covalent or ionic. Describe two
pieces of information the chemist could gather in
order to decide if this compound is covalent or ionic.
Explain your answer.
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9. Answer - Full-credit answers should include two of
the following points:
• The chemist could measure the compound’s melting
point. Melting points of ionic compounds are usually
higher than those of covalent compounds.
• The chemist could see if the substance dissolves in
water. Many ionic compounds dissolve in water, while
most (but not all) covalent compounds do not.
• The chemist could measure the electrical conductivity
of a solution containing the compound. Solutions of
ionic compounds conduct electric current, while
solutions of covalent compounds do not.
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10. When you add a small amount of a weak acid to a
sample of seawater, a neutralization reaction occurs.
What can you conclude about the pH of seawater?
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10. Answer -
The seawater must be basic if a neutralization reaction
happens when an acid is added. So, the pH of the
seawater must be greater than 7.
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