Question

1. circle the letter of each substance that dissolves in water. a. salt b. oil c. oxygen d. wax 16. a substance that hates, or “fears” water is called __________. 17. the amount of heat needed to increase the temperature of a certain mass of a substance by 1°c is its __________. 18. true or false? compared with other substances, water requires a lot of heat to increase its temperature. 19. circle the letter of each sentence that is true about waters specific heat. a. it is due to the many attractions among water molecules. b. it makes large bodies of water heat up more quickly than nearby land. c. it makes large bodies of water cool off more slowly than nearby land. d. it leads to warmer air over land than over water on summer days.

Explanation:

1. Salt is an ionic compound that dissociates in water due to the polar - nature of water molecules. Oil is non - polar and does not dissolve in water, oxygen is a gas that has limited solubility in water, and wax is a non - polar solid that does not dissolve in water.
2. Substances that "hate" water are called hydrophobic substances.
3. The amount of heat needed to increase the temperature of a certain mass of a substance by 1°C is its specific heat.
4. Water has a high specific heat. Compared with other substances, water requires a lot of heat to increase its temperature. This is due to the many hydrogen bonds (intermolecular attractions) among water molecules. So the statement is True.
5. Water has a high specific heat. Large bodies of water heat up more slowly and cool off more slowly than nearby land. So the true statement is c.

Answer:

1. a. salt
2. hydrophobic substance
3. specific heat
4. True
5. c. It makes large bodies of water cool off more slowly than nearby land.