Question

1. the tendency for water molecules to be attracted and stick to other substances is called
2. circle the letter of each sentence that is true about waters surface tension.

a. it helps some insects \skate\ across the surface of the water.
b. it refers to the tightness across the surface of the water.
c. it is caused by polar molecules repelling each other.
d. it causes raindrops to form round beads.

1. what is a curved surface in a graduated cylinder called? a
2. circle the letter of each sentence that is true about capillary action.

a. it explains how water moves against the force of gravity.
b. it is due to the attraction among molecules of water and surrounding materials.
c. it prevents water from moving through materials with pores.
d. it causes clothing to stay dry.

1. how does capillary action allow water to climb up the sides of a straw?
2. a mixture that forms when one substance dissolves another is called a(n)

the substance that does the dissolving is called a(n)

1. why can water dissolve many substances?
2. circle the letter of each substance that dissolves in water.

a. salt b. oil c. oxygen d. wax

1. a substance that hates, or \fears\ water is called

Explanation:

1. Adhesion is the attraction of water molecules to other substances.
2. a. Surface - tension allows some insects to "skate" on water. b. It is the tightness across water's surface. d. It causes raindrops to form round beads. c is false as it is caused by hydrogen - bonding between polar water molecules, not repulsion.
3. A curved surface in a graduated cylinder is called a meniscus.
4. a. Capillary action helps water move against gravity. b. It is due to the attraction between water molecules and surrounding materials. c and d are false as it allows water to move through porous materials and does not keep clothing dry.
5. Capillary action occurs because of the adhesion of water molecules to the straw's surface and cohesion among water molecules, which allows water to climb up the sides of the straw.
6. A mixture formed when one substance dissolves another is a solution. The substance that does the dissolving is a solvent.
7. Water can dissolve many substances because it is a polar molecule, and its partial charges can attract and surround ions and other polar molecules.
8. a. Salt and c. oxygen dissolve in water. Oil and wax are non - polar and do not dissolve in water.
9. A substance that "fears" water is called hydrophobic.

Answer:

1. Adhesion
2. a. It helps some insects "skate" across the surface of the water.; b. It refers to the tightness across the surface of the water.; d. It causes raindrops to form round beads.
3. Meniscus
4. a. It explains how water moves against the force of gravity.; b. It is due to the attraction among molecules of water and surrounding materials.
5. Due to adhesion of water molecules to the straw's surface and cohesion among water molecules.
6. Solution; Solvent
7. Because it is a polar molecule and its partial charges can attract and surround ions and other polar molecules.
8. a. salt; c. oxygen
9. Hydrophobic