Review for Final Exam

Which quantity of N₂ gas has a volume of 11.2 liters at STP?

• 28.0 g

• 1.0 mol

• 14.0 g

• 2.0 mol

Answer explanation

22.4 L is equal to 1.0 mole of gas at STP.

The property of water that allows it to dissolve many compounds and transport materials is –

• Density

• Polarity

• Specific Heat

• Molecular Mass

Answer explanation

The polarity of water allows it to dissolve polar compounds.

Which compound is insoluble in water?

• PbSO₄

• KOH

• Na₃PO₄

• NH₄Cl

Answer explanation

All of Group 1 and Ammonium is always soluble. (K, Na, NH₄)

A change in pressure would have the greatest effect on the solubility of a -

• Gas in a Liquid

• Liquid in a solid

• Liquid in a Liquid

• Solid in a Liquid

Answer explanation

The greater the pressure the greater the solubility of a gas in a liquid.

Why is ammonia classified as a base according to the Bronsted-Lowry theory of acids and bases?

• It accepts electrons

• It donates electrons

• It donates Protons

• It accepts protons

What is the concentration of a solution if 2.0 moles of sodium chloride is dissolved in 0.50 liters of water?

• 2.0 M

• 1.0 M

• 0.5 M

• 4.0 M

Answer explanation

M = mol/liter = 2.0/0.5

According to a pH scale, which pH would be the strongest acid?

• 6

• 9

• 3

• 12

Answer explanation

Acids go from 0-7, the strongest being closest to 0.

What is the pH of a solution with a hydrogen ion concentration of 1.0 x 10^-6 mol/L?

• 4

• 6

• 1

• 12

Answer explanation

The exponent shows where on the pH scale the concentration falls.

The motion of atoms and molecules in a substance is

• Thermal Energy

• Chemical Energy

• Mechanical Energy

• Electromagnetic Energy

Answer explanation

Thermal Energy is related to Kinetic Energy

Exothermic reactions -

• do no require any activation energy

• sometimes have a positive change in enthalpy

• always releases energy

• never have reverse reactions

Answer explanation

Exothermic gives of heat and energy