Question

1. in a water molecule, the oxygen atom is

a. neutral (no charge)
b. both positively and negatively charged
c. positively charged
d. negatively charged

1. water molecules stick together through what type of bonding

a. chemical bonds
b. all of these are true
c. covalent bonds
d. hydrogen bonds

1. cohesion occurs when water molecules

a. are attracted to each other
b. are held together with hydrogen bonds
c. stick to other water molecules
d. all of these are true

1. adhesion occurs when water molecules

a. stick to other substances
b. none of these are true
c. are pulled apart
d. stick to other water molecules

1. water has a high specific heat; this means

a. oceans freeze solid
b. it takes a lot of heat to heat up water
c. the bottom of the ocean is colder
d. it doesnt take a lot of heat to heat water

1. which of the following scenarios is an example of cohesion

a. water molecules stick to one another and form a bead
b. water sticks to the walls of blood vessels
c. water molecules stick to the surface of a mirror

1. certain insects can \walk on water\ due to the ____ of water, created by ____.

a. this is a false statement
b. surface tension; cohesion
c. cohesion; universal solvent
d. adhesion; specific heat

1. how many hydrogen atoms does each water molecule have?

a. 6
b. 3
c. 2
d. 1

1. in a sugar - water mixture, what is the water called?

a. solute
b. mixture
c. solution
d. solvent

1. which of the following is more electronegative (has more of the negative charge) in a water molecule?

a. hydrogen
b. neither, they are both equal
c. oxygen

Explanation:

1. In a water molecule, oxygen is more electronegative and has a partial negative charge, so the answer is d.
2. Water molecules stick together through hydrogen - bonds, so the answer is d.
3. Cohesion is when water molecules are attracted to each other, held by hydrogen bonds and stick to other water molecules, so the answer is d.
4. Adhesion is when water molecules stick to other substances, so the answer is a.
5. High specific heat of water means it takes a lot of heat to heat up water, so the answer is b.
6. Cohesion is water molecules sticking to one another, like forming a bead, so the answer is a.
7. Insects can walk on water due to surface tension created by cohesion, so the answer is b.
8. A water molecule has the formula H₂O, so it has 2 hydrogen atoms, the answer is c.
9. In a sugar - water mixture, water is the solvent, so the answer is d.
10. Oxygen is more electronegative in a water molecule, so the answer is c.

Answer:

1. d. negatively charged
2. d. hydrogen bonds
3. d. all of these are true
4. a. stick to other substances
5. b. it takes a LOT of heat to heat up water
6. a. water molecules stick to one another and form a bead
7. b. surface tension; cohesion
8. c. 2
9. d. Solvent
10. c. Oxygen