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 colored compounds, effectively removing stains from dishes.

First, calculate the moles of hydrogen peroxide: $ext{Moles of } H_2O_2 = \frac{0.051 g}{34 g/mol} \approx 0.0015 ext{ moles}$ From the balanced equation, 2 moles of $H_2O_2$ produce 1 mole of $O_2$, so: $0.0015 ext{ moles } H_2O_2 \times \frac{1 \text{ mole } O_2}{2 \text{ moles } H_2O_2} \approx 0.00075 ext{ moles } O_2$ Now, calculate the volume of $O_2$ produced: $0.00075 ext{ moles } \times 24 L/mol = 0.018 L$

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

The functional group circled in the egg white protein structure is the amide or peptide link.

One possible structural formula for an amino acid made from the breakdown of the protein chain is:

    H   O
    |   ||
HO--C--N
    |   |
    R   H
    |
    H

Where R represents the variable side chain of the amino acid.

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

A change in conditions that could cause the enzyme molecules to change shape is an increase in temperature or a change in pH level.

The reaction type shown in the first stage of producing TAED is a condensation reaction.

The structural formula for TAED is:

     O        CH3
     ||       |
HO--C--N--C--CH2--N--(C--CH3)--C--O
     |        |
    CH3      OH

Where this represents the complete molecular structure.