Week 6 Exercises

Identify ALL of the molecules that could react as a Brønsted-Lowry acid in a chemical reaction:

• HCl

• FeCl3

• CO2

• H2O

• H3PO4

Which one of the following mechanistically depicts the acid-base reaction that occurs when hydrobromic acid(HBr) is added to methanol (CH4O)?

Reminder: curved arrow notation is used to show the movement of electrons.

• A

• B

• C

• D

Which of the following are strong acids? Please select ALL that are strong acids.

• HCl

• H2SO4

• NaOH

• HF

• HNO3

Which of the following reactions are redox reactions? (please select one that apply)

• SO3(g)+ H2O(l) → H2SO4(aq)

• Al(s) + 3 Ag1+(aq) → Al3+(aq) + 3 Ag(s)

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• 2 KMnO4(s) + 3 Na2SO3(s) + H2O(I) → 2 MnO2(s) + 3 Na2SO4(s) + 2 KOH(s)

• 4 K(s) + O2(g) → 2 K2O(s)

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Identity what type of chemical reaction this is:

HCN + KOH ⇌ KCN + H2O

• acid-base

• oxidation-reduction

• precipitation

• dissolution

Ethanol reacts with phosphorus trichloride to yield chloroethane and phosphorous acid according to the following balanced chemical equation:

3 C2H5OH + PCl3 > 3 C2H5Cl + H3PO3

If a chemist starts with 105.0 g of ethanol and 135.65 g of phosphorus trichloride, then what is the limiting reagent?

• H3PO3

• C2H5Cl

• PCl3

• C2H5OH

Determine the oxidation state of the nitrogen in each of the following molecules or ions.

N2H4 and N2O

• +2 and +1

• -2 and +2

• -2 and +1

• +2 and +2