Gr12 Chemistry practice21

Substances that doesn't blend smoothly throughout and in which the individual

substances remain distinct…

• A homogenous mixture

• a solution

• heterogeneous mixture

• Alloy

The diffusion of a solvent from a higher concentration to a lower concentration is

called...

• Molar concentration

• Dilution

• Osmosis

• Solubility

Isotopes are equal in...

• Neutron no.

• Proton no.

• Mass no.

• Atomic size

Which of the following elements is the most stable?

• Ne

• Na

• Ca

• K

The mass of hydrogen required to react with nitrogen based on this equation,

N2 (g)+3H2 (g) → 2NH3 (g) , knowing that N=14, H=1.

• 1 g

• 2 g

• 6 g

• 12 g

1 gram of pure water needs one calorie to raise the temperature by…

• 4 °C

• 3 °C

• 2 °C

• 1 °C

At chemical equilibrium the rates of the forward and reverse reactions is ..

• High

• Zero

• Equal

• Different

Which of the following is an oxidation reaction?

• I2 → 2I-

• Cl2 → 2Cl-

• Ag+ → Ag

• Fe+2 → Fe+3

What happened to the chlorine in the following reaction: Cl2(g) + 2e- → 2Cl-(aq)

• Oxidation

• Reduction

• Neutralization

• Nothing

In the electrochemical cell: The cathode electrode experiences ..

• Electrolysis

• Neutralization

• Reduction

• Oxidation