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No Slide Title1. 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
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
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
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.
CRCT Preparation
A glucose
B carbohydrate
C fat
D protein
Chapter 15
CRCT Preparation
A glucose
B carbohydrate
C fat
D protein
CRCT Preparation
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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
Chapter 15
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.
Chapter 15
CRCT Preparation
Chapter 15
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.
CRCT Preparation
Chapter 15
6. The pH of some common household substances is listed in the table. Which substance would most likely feel slippery?
A lemon juice
Chapter 15
6. The pH of some common household substances is listed in the table. Which substance would most likely feel slippery?
A lemon juice
A the concentration of sodium ions in
a solution
a solution
a solution
Chapter 15
CRCT Preparation
A the concentration of sodium ions in
a solution
a solution
a solution
CRCT Preparation
A hydrogen
B carbon
C oxygen
D nitrogen
Chapter 15
CRCT Preparation
A hydrogen
B carbon
C oxygen
D nitrogen
CRCT Preparation
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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.
Chapter 15
CRCT Preparation
Chapter 15
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.
CRCT Preparation
Chapter 15
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?
CRCT Preparation
Chapter 15
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.
CRCT Preparation