23. Macromolecules containing large amounts of hydroxyl groups (-OH) have less potential energy than molecules that are largely hydrocarbons, which of the following best explains why? a) Carbon – Hydrogen bonds are short and very strong
b) Carbon – Hydrogen bonds are long and comparatively weak
c) Oxygen – Hydrogen bonds are long and comparatively weak
d) Hydroxyl groups are easily removed in enzyme-catalyzed reactions

b) Carbon-Hydrogen bonds are long and comparatively weak

Explanation:

Carbon-Hydrogen bond is a covalent bond between a carbon and hydrogen atom in which carbon shares its valence electrons with four hydrogen atoms.

Carbon-Hydrogen bonds are long and carbon-hydrogen combine together to form several long chain organic comounds such as methyl, ethyl, isopropyl, and benzyl etcetera but are  comparatively weak.

Electronegativity affects the bond stregth of the hydrogen bond and there is small difference in electronegativities of the Carbon-Hydrogen that makes it comparatively weak.

Hence, the corrrect answer is "b) Carbon-Hydrogen bonds are long and comparatively weak".

1)

i))the process of preparing food by green plants in the presence of sunlight is called photosynthesis.

ii) leaf is the site for photosynthesis.

iii) it takes place as,

6h2o+6co2=c6h12o6+602

measuring physical properties lab reportinstructions: in the physical properties lab, you will test the physical properties of different building materials in order to pick the appropriate materials for a new home in tiny world. record your observations and test measurements in the lab report below. youwill submit your completed report.name and title: lyric lawton, mr.herbert, 10/13/17, physical properties lab. objective(s): i need to parvus build his house out of the right material, so he will stay cool in the mountains.hypothesis: if we use wood to build the roof of the house, then the temperature inside the house will remain cooler.if we use clay brick to build the walls and floors of the house, then the temperature inside the house will remain cooler.if we use aluminium to bring electricity into the home, then it will allow electricity to flow into the home at a faster rate.if we use iron to construct the latches on the windows and doors, then the magnetism will keep the latches secure.