Unit 9 - Solutions Test Review

Under which conditions of temperature and pressure is a gas most soluble in water?

• Low temperature and high pressure

• High temperature and high pressure

• High temperature and low pressure

• Low temperature and low pressure

Why is water considered to be the "universal solvent"?

• Water is an effective solvent of both polar and nonpolar molecules.

• Water dissolves more chemicals, both inorganic and organic, than any other solvent.

• Water is the only solvent found in abundance throughout the universe.

• Water is an effective solvent in all three phases at standard pressure.

Tags

NGSS.HS-ESS2-5

What is the total number of grams of KCl (formula mass = 74.6) in 1.00 liter of a 0.200 molar solution?

• 7.46 g

• 14.9 g

• 22.4 g

• 29.8 g

What volume of 1.0 M sodium phosphate, to the nearest tenth of a liter, must be used to make 4.0 L of 0.80 M sodium phosphate?

• 0.2 L

• 1.2 L

• 2.2 L

• 3.2 L

The attraction between water molecules and a Na⁺ ion or a Cl^- ion occurs because water molecules are —

• nonpolar

• symmetrical

• polar

• linear

Tags

NGSS.HS-PS2-6

A substance is classified as an electrolyte because —

• it has a high melting point.

• its aqueous solution has a pH value of 7.

• its aqueous solution conducts an electric current.

• it contains covalent bonds.

Tags

NGSS.HS-PS2-5

What do sugar packets more completely dissolve than do sugar cubes when placed in similar cups of tea?

• The temperature of the tea with cubes was lower than the one with packets.

• Unlike the packet, the cube is compacted so not all sugar molecule surface areas contact the tea.

• Adding a cube decreases the likelihood of stirring the tea, where as adding a packet reminds people to stir.

• Unlike a the tea cup with cubes, tea with packets is served in a bigger cup that allows for more tea.

Water in the bloodstream dissolves —

• cells

• fats

• gases

• viruses

To the nearest gram, what mass of NaCI is needed to produce 1250 mL of a 3.50 M saltwater solution?

• 104 g

• 134 g

• 234 g

• 268 g

What is the molarity of iron (III) nitrate, made from 10 mL of a 1.00 M solution, and then diluted by adding 90 mL water?

• 0.1 M

• 10 M

• 1000 M

• 10,000 M

Tags

NGSS.HS-PS1-7