CHEM Test 2 (11th) 21-22

A solution is a

• physically heterogeneous system made up by two or more components

• physically homogeneous system made up by two or more components

• physically homogeneous system made up only by two components

What types of solvents are there?

• commons, rares

• light, heavy

• inerts, reactives

Water is the most common solvent because

• it is a polar molecule

• it is a non-polar molecule

• none of the above

What is the fundamental equation of solutions?

• Solute + Solution = Solvent

• Solute - Solvent = Solution

• Solute + Solvent = Solution

Concentration in solutions is defined as

• the abundance of the solvent in the mass solution

• the abundance of the solute in the mass solvent

• the abundance of the solute in the mass solution

Solutions have only physical units to express their concentration

• True

• False

Molarity, Normality and Molality are examples of

• physical units of concentration

• chemical units of concentration

• none of the above

%w/w, %w/v, %v/v are examples of

• physical units of concentration

• chemical units of concentration

• biological units of concentration

20 g of salt are dissolved in 180 g of water. What is the mass of solution?

• 200 g

• 180 g

• 220 g

30 g of salt are dissolved in 270 g of water. What is the concentration of the solution?

• 10 %w/w

• 1 %w/w

• 30 %w/w