Question 1

Which property of water allows insects, such as water striders, to walk on the surface of a pond without sinking?

Accepted Answer

Surface tension due to hydrogen bonding

Question 2

Why does ice float on water?

Accepted Answer

Ice has a lower density than water because of its hexagonal arrangement of molecules

Question 3

Which functional group is found in alcohols and is responsible for their polar nature?

Accepted Answer

Hydroxyl group $$-OH$$

Question 4

A lake remains liquid in winter even when the air temperature drops below $$0^	ext{o}C. $$Which property of water is most responsible for this phenomenon?

Accepted Answer

Water's high specific heat capacity

Question 5

Which of the following best explains why sweating cools the human body?

Accepted Answer

Evaporation of sweat absorbs heat due to water's high heat of vaporization

Question 6

Which statement about carbon is correct?

Accepted Answer

Carbon can form four covalent bonds, allowing it to build large, complex molecules

Question 7

Which functional group is commonly found at the end of a carbon skeleton and is characteristic of organic acids?

Accepted Answer

Carboxyl group $$-COOH$$

Question 8

A molecule with the formula $$C_6H_{12}O_6$ is dissolved in water. Which property of water allows this molecule to dissolve easily?

Accepted Answer

Water's polarity and ability to form hydrogen bonds

Question 9

Which of the following is NOT a reason why water is essential for life?

Accepted Answer

Water is hydrophobic and repels most biological molecules

Question 10

Which property of water is most important for maintaining stable temperatures in aquatic environments?

Accepted Answer

High specific heat capacity

Question 11

Which of the following best describes a hydrocarbon?

Accepted Answer

A molecule containing only carbon and hydrogen atoms

Question 12

Which functional group is found in amino acids and is responsible for their basic properties?

Accepted Answer

Amino group $$-NH_2$

Question 13

Which of the following statements about water molecules is TRUE?

Accepted Answer

Water molecules have a bent shape and are polar, allowing hydrogen bonding

Question 14

Which property of water explains why coastal areas have milder climates than inland areas?

Accepted Answer

Water's high specific heat capacity

Question 15

Which of the following is a geometric isomer?

Accepted Answer

Molecules that differ in the spatial arrangement of atoms around a double bond

Question 16

Which functional group is important in the transfer of energy within cells?

Accepted Answer

Phosphate group $$-PO_4$^{3-}$$

Question 17

A scientist is studying a molecule that is hydrophobic. Which of the following is most likely true about this molecule?

Accepted Answer

It is composed mainly of hydrocarbons

Question 18

Which of the following best describes the role of functional groups in organic molecules?

Accepted Answer

They determine the molecule's solubility and chemical reactivity

Question 19

Which property of water is most important for the transport of nutrients and waste in living organisms?

Accepted Answer

Water's ability to act as a solvent for polar substances

Question 20

Which of the following is a correct statement about enantiomers?

Accepted Answer

They are mirror images of each other and may have different biological activities

LEC 3 Water and Carbon: Properties, Structure, and Biological Importance

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