Trial UPS 1 ( Exercise )

1. Lithium is used to treat and prevent episodes of mania in people with bipolar disorder. The mass of one mole of lithium is 6.941 grams. Find the relative atomic mass of lithium.

• 6.941

• 6.941 amu

• 0.578

• 0.578 amu

Potassium dichromate, K₂Cr₂O₇ is an oxidising agent in organic chemistry which is milder than potassium permanganate, KMnO₄. It is used to oxidise alcohols. What is the oxidation number for Cr in K₂Cr₂O₇?

• +14

• +6

• 0

• -2

Ethene with the empirical formula of CH₂ has a molecular mass of 28 g/mol. Give the molecular formula of ethene. (Empirical formula mass of CH₂ = 14 g/mol)

• CH₂

• C₂H₄

• C₂H₆

• C₄H₈

• 12 protons and 26 electrons

• 12 protons and 13 electrons

• 12 protons and 10 electrons

• 12 protons and 22 electrons

• A

• B

• C

• D

• A

• B

• C

• D

• A

• B

• C

• D

• A

• B

• C

• D

• A

• B

• C

• D

• A

• B

• C

• D