In the sapling prelab for this experiment you used spartan to calculate the enthalpy of formation (δhf) of the hydrogen bond between two ethanol molecules. compare that value with the enthalpy of vaporization (δhvap) you found experimentally for ethanol. the magnitudes of the two values should be close, but the sign is opposite. why? what are the values and how are they related?

British cologoinst admisitrion

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.

The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.