Gr12_Practice_23_Chemistry

The second principle energy level in an atom contains…

• 1 sublevel

• 2 sublevels

• 3 sublevels

• 4 sublevels

The curve that represents the relation between T and V…

• A

• B

• C

• D

1 kg of wood dust burns faster than 1 kg of a piece of wood because of the…

• temperature

• concentration

• chemical composition

• surface area

When an atom or ion is oxidized then its oxidation number ..

• Decreases

• Increases

• Equals zero

• Doesn’t change

In the following reaction, what is the reducing agent?

• S

• Cl₂

• H₂S

• HCl

The electrode at which reduction occurs is

• always the cathode.

• always the anode.

• either the anode or the cathode.

• always the half-cell.

When a rechargeable cell is being recharged, the cell acts as a(n)

• fuel cell.

• voltaic cell.

• electrolytic cell.

• Leclanche cell.

When silver is electroplated onto another metal, Ag⁺ is

• oxidized at the anode.

• reduced at the cathode.

• oxidized at the cathode.

• reduced at the anode.

Coating iron with another metal that is more resistant to corrosion (or oxidation) is known as…

• electrolysis

• clarification.

• ionization

• galvanization

The use of electrical energy to bring about a chemical reaction is..

• refinement.

• electrolysis.

• distillation.

• galvanization.