Question 7 (1 point) Water\'s high specific heat is mainly a consequence of the

Question

Question 7 (1 point) Water's high specific heat is mainly a consequence of the 1) small size of the water molecules. 2) high specific heat of oxygen and 3) absorption and release of heat when 4) fact that water is a poor heat 5) inability of water to dissipate heat hydrogen atoms. hydrogen bonds break and form. conductor. into dry air. Save Question 8 (1 point) Which of the following true statements can be attributed to water's high specific heat? 1) Oil and water do not mix well Our body temperature can take a long time to passively change because it is composed mostly of water. 3) Ice floats on water 4) Sugar dissolves in hot tea faster than in iced tea. Save

Explanation / Answer

7. Water's high specific heat is mainly a consequence of the fact that water is a poor heat conductor. Specific heat of a substance is it's ability to store heat. As water conducts less heat so it has the ability to store more. So, the option 4 is the correct choice here.

8. Our body temperature can take a long time to passively change because it is composed mostly of water - this statement is true to attribute water's high specific heat. 70% of our body is composed of water. This is due to the high specific heat of water. The water content of our body carries heat which is controlled our brain. When temperatures increases or decreases passively (from external sources), it take longer time to change the temperature of our body. So, option 2 is the correct choice here.

9. pH = -log[H+]

pH = 4 means the concentration of H+ ions is 1/10000 mole/liter. pH = 7 means the concentration of H+ ions is 1/10000000 mole/liter. After comparing both the values we can come to the conclusion that the hydrogen ion concentration in solution X is 1000 time as great as the concentration of hydrogen ions in solution Y. So none of the other answer choices correctly describes these solutions. The option 5 is the correct choice here.

10. The solution contains 0.0001 (10-4) moles of hydrogen ions per liter. pH = -log [H+] = - (log 10-4) = -(-4 X log 10) = 4 (as log 10 = 1). So, the pH of the given solution is 4 and it is acidic because the pH value which is lower than 7 indicates to the acidic solution. As the solution is acidic so eventually it is a donar H+ ions. So, option 3 is the correct choice here.

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