1. < BackNext >PreviewMain Chemical Compounds Preview Chapter 15 CRCT Preparation

2. < BackNext >PreviewMain Chapter 15 CRCT Preparation 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

3. < BackNext >PreviewMain Chapter 15 CRCT Preparation 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

4. < BackNext >PreviewMain 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.

5. < BackNext >PreviewMain 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

6. < BackNext >PreviewMain 3. Which of the following substances is a lipid? A glucose B carbohydrate C fat D protein Chapter 15 CRCT Preparation

7. < BackNext >PreviewMain Chapter 15 3. Which of the following substances is a lipid? A glucose B carbohydrate C fat D protein CRCT Preparation

8. < BackNext >PreviewMain 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 CRCT Preparation

9. < BackNext >PreviewMain 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 CRCT Preparation

10. < BackNext >PreviewMain 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

11. < BackNext >PreviewMain 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

12. < BackNext >PreviewMain 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 B vinegar C milk D ammonia CRCT Preparation

13. < BackNext >PreviewMain 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 B vinegar C milk D ammonia CRCT Preparation

14. < BackNext >PreviewMain 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 Chapter 15 CRCT Preparation

15. < BackNext >PreviewMain Chapter 15 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 CRCT Preparation

16. < BackNext >PreviewMain 8. All organic compounds are based on which element? A hydrogen B carbon C oxygen D nitrogen Chapter 15 CRCT Preparation

17. < BackNext >PreviewMain Chapter 15 8. All organic compounds are based on which element? A hydrogen B carbon C oxygen D nitrogen CRCT Preparation

18. < BackNext >PreviewMain 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

19. < BackNext >PreviewMain 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

20. < BackNext >PreviewMain 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

21. < BackNext >PreviewMain 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