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 or to disinfect surfaces, effectively removing stains or killing bacteria.

First, calculate the moles of hydrogen peroxide:

$\text{Moles of } H_2O_2 = \frac{0.051 \text{ g}}{34 \text{ g/mol}} = 0.0015 \text{ mol}$

Using the reaction, 2 moles of H2O2 produce 1 mole of O2:

$\text{Moles of } O_2 = 0.0015 \text{ mol } H_2O_2 \times \frac{1 ext{ mol } O_2}{2 ext{ mol } H_2O_2} = 0.00075 ext{ mol}$

To find the volume of oxygen gas:

$\text{Volume} = 0.00075 \text{ mol} \times 24 \text{ L/mol} = 0.018 \text{ L}$

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

The functional group circled is an amine group.

One of the molecules made when the section of egg white protein chain is completely broken down is glycine, which can be represented as:

  H   O
   \  ||
    N--C--H
   /  
  H   

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

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

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

The structural formula for TAED can be represented as:

      O
      ||
H3C-N-CH2-CH2-N-CH2-CO-CH3
      |       | 
      H    H