Dishwasher tablets contain chemicals which remove dirt from dishes - Scottish Highers Chemistry - Question 9 - 2017

Another action of the bleach produced by the dishwasher tablets is to break down or remove stains from surfaces.

1. Calculate moles of H2O2:

   Moles = \frac{0.051 \text{ g}}{34 \text{ g/mol}} = 0.0015 \text{ mol}

2. From the decomposition equation, 2 moles of H2O2 produce 1 mole of O2.

   Thus, 0.0015 moles of H2O2 produce:

   \frac{0.0015}{2} = 0.00075 \text{ mol of O2}

3. Volume of O2 produced = moles × 24 L/mol:

   0.00075 \text{ mol} × 24 \text{ L/mol} = 0.018 \text{ L}

   Therefore, the volume of oxygen gas produced is 0.018 L.

The small, water-soluble molecules produced when proteins are broken down completely are amino acids.

The functional group circled is an amine group.

One structural formula for an amino acid, for example, Glycine (C2H5NO2), can be drawn as follows:

    H   O
    |   ||
H2N-C--C-OH
    |   \
    H    H

This formula shows the amino (-NH2) and carboxyl (-COOH) groups.

The term used to describe the change in shape of enzyme molecules is denaturation.

A change in temperature or pH, moving them beyond their optimum, would cause the enzyme molecules to change shape.

This type of reaction can be suggested as a condensation reaction, as it involves the joining of ethylene diamine and acetic anhydride, resulting in the elimination of water.

The structural formula for TAED can be represented as:

    H3C    O
      \    ||
       C--N--C--N
      /    \  |
    H3C   O-C--C--O
               ||
               O