Water and Solutions Review

Which of the following is NOT TRUE about water?

• The water molecule has two bonded pairs and two lone pairs of electrons

• The water molecule is a bent shape.

• The oxygen atom in water is more electronegative than the hydrogen.

• The bond between hydrogen and oxygen where electrons are shared is called a hydrogen bond.

Tags

NGSS.MS-PS1-1

How does a surfactant reduce surface tension?

• by increasing dipole interaction

• by decreasing the distances between water molecules

• by increasing dispersion forces

• by interfering with hydrogen bonding

What causes water’s low vapor pressure?

• covalent bonding

• hydrogen bonding

• ionic attractions

• dispersion forces

Surface tension (a)  
a. is the inward force which tends to minimize the surface area of a liquid
b. is increased by hydrogen bonding
c. may be decreased by detergents
d. all of the above

• is the inward force which tends to minimize the surface area of a liquid

• is increased by hydrogen bonding

• may be decreased by detergents

• all of the above

The condensation of steam is a(n) (a)   process.

• electrolytic

• exothermic

• catalytic

• endothermic

Tags

NGSS.MS-PS1-4

How many water molecules are in 4 formula units of calcium chloride dihydrate (CaCl₂·2H₂O)?

• 2

• 4

• 6

• 8

Which of the substances is the most soluble in water?

• CH₄

• NaCl

• Br₂

• O₂

During the process of (a)   , a (b)   dissolves in a (c)   .

• Solvent, solvation, solute

• Solute, solvent, solvation

• Solvation, solute, solvent

• Solute, solvation, solvent

An electric current would be conducted by ______.

• a sugar solution

• gasoline

• a salt solution

• none of the above

The silica packet found in electronics and clothing is called a _____ and absorbs water from the air because it is _______.

• Salt, deliquescent

• Salt, desiccant

• Efflorescent, salt

• Desiccant, deliquescent