Science 20 Final Review

What is the molar mass of sodium sulfate, Na2SO4 in g/mol?

Water is an effective solvent for ionic compounds because:

• Water molecules react with all solutes to form new compounds directly.

• Water increases the temperature of the reactants, allowing bonds to break more easily.

• Substances must be completely neutralized by water before any chemical reaction can occur.

• Dissolving breaks down substances into ions or molecules that can move freely and collide to react.

Which solution is a base?

• CH3COOH

• NaOH

• HCl

• H2SO4

Which of the following metals is the most unstable?

• Gold

• Iron

• Lithium

• Copper

Which of the following lists metals in order of increasing reactivity?

• Copper, Gold, Sodium, Iron

• Iron, Gold, Copper, Sodium

• Sodium, Iron, Copper, Gold

• Gold, Copper, Iron, Sodium

The molar concentration of 5.0g of NaCl in 500mL of water in mol/L is

Which petrochemical process involves separating hydrocarbons based on boiling point?

• Polymerization

• Distillation

• Reforming

• Cracking

A car takes 5.00 seconds to accelerate from 13.9m/s to 26.4m/s. The displacement in metres is:

This layer of the earth deflects S-waves:

• Mantle

• Crust

• Outer core

• Inner core

A good index fossil is:

• Common and localized

• Rare and localized

• Common and widespread

• Rare and widespread