Yr 13 March CHEM Mock review 2023

The electronic configuration of a Copper atom

• [Ar] 3d9 4s2

• [Ar] 3d9

• [Ne] 3d10 4s1

• [Ar] 3d10 4s1

The formula of the chromium ion that forms when excess NaOH is added to a solution of CrCl3

• [Cr(OH)4]+

• Cr(OH)3

• [Cr(OH)6]3+

• [Cr(OH)6]3-

The equation for the reaction between hot concentrated NaOH and chlorine

• 3NaOH + 6Cl2 --> NaCl + 5NaClO3 + H2O

• 6NaOH + 3Cl2 --> 5NaCl + NaClO3 + 3H2O

• 6NaOH + 3Cl2 --> 5NaCl + NaClO + 3H2O

• 2NaOH + Cl2 --> NaCl + NaClO + H2O

Disproportionation ...when

• a molecule gets both oxidised and reduced at the same time

• a species oxidation number goes up and down

• a species undergoes redox

• an element gets both oxidised and reduced at the same time.

Describe what is seen when water is added to SiCl4

• A brown precipitate is preoduced

• Green fumes are produced

• A white precipitate and steamy fumes are produced

• A black precipitate with orange brown fumes.

What colour is the precipitate.....lead Iodide?

• Green

• Canary yellow

• Brown

• White

What colour is the precipitate.....Iron III Hydroxide?

• Green

• Canary yellow

• Brown

• White

What colour is the precipitate.....Iron II Hydroxide?

• Green

• Canary yellow

• Brown

• White

Identify the correct catalyst for the Haber process

• F

• Fe

• Fe2+

• Fe3+

The correct equation for showing how CO is a reducing agent....

• 3CO2 +Fe2O3 --> 2Fe + 3CO

• 2CO +Fe2O3 --> 2Fe + 3CO2

• 2CO +Fe2O3 --> 3Fe + 2CO2

• 3CO +Fe2O3 --> 2Fe + 3CO2