Unit 5 Practice Problems

What is the molarity of 1.5 liters of an aqueous solution that contains 2 moles of lithium fluoride?

• 1.33 M

• 0.75 M

Which expression could represent the concentration of a solution?

• 3.5 g

• 3.5 ppm

• 3.5 mL

• 3.5 mol

Which phrase describes a compound consists of two elements?

• a mixture in which the elements are in a variable proportion

• a mixture in which the elements are in a fixed proportion

• a substance in which the elements are chemically combined in a variable proportion

• a substance in which the elements are chemically combined in a fixed proportion

Which type of matter is represented by the particle diagram?

• an element

• a compound

• a homogenous mixture

• a heterogenous mixture

At standard pressure, what is the temperature at which a saturated solution of NH₄Cl has a concentration of 60 g NH₄Cl per 100g of water?

• 66°C

• 47°C

• 22°C

• 17°C

Which process is commonly used to separate a mixture of ethanol and water (two liquids with different boiling points)?

• distillation

• magnetism

• filtration

• chromatography

According to Table F, which ions combine with chloride ions to form an insoluble compound?

• Fe²⁺ ions

• Ca²⁺ ions

• Li⁺ ions

• Ag⁺ ions

An aqueous solution has a mass of 490 grams containing 0.0085 grams of calcium ions. The concentration of calcium ions in this solution is

• 4.3 ppm

• 8.5 ppm

• 17 ppm

• 34 ppm

A mixture consists of sand and an aqueous salt solution. Which procedure can be used to separate the sand, salt, and water from each other?

• Evaporate the water, then filter out the salt.

• Evaporate the water, then filter out the sand.

• Filter out the sand, then evaporate the water.

• Filter out the salt, then evaporate the water.

The ratio of chromium to iron to carbon VARIES among the different types of stainless steel. Therefore, stainless steel is classified as

• a compound

• an element

• a mixture

• a substance