Atmospheric pollutants from fuels 4.9.3.1 Flashcards

1
Q

What gases are released in the atmosphere when a fuel is burned?

A
>Carbon dioxide
>Water vapour
>Carbon monoxide
>Sulphur dioxide
>Oxides of nitrogen
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2
Q

What is the cause of the pollutant carbon monoxide and how can it be reduced?

A

> Cause: incomplete combustion

>Reduced: catalytic converter convert to CO2

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3
Q

What is the cause of the pollutant sulphur dioxide and how can it be reduced?

A

> Cause: burning fuels containing sulphur

>Reduce: removed from power stations by limestone

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4
Q

What is the cause of the pollutant oxides of nitrogen (NOx) and how can it be reduced?

A

> Cause: from N2 and O2 at very high temperatures

>reduce: converted to N2 by a catalytic converter

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5
Q

What are the problems with bacteria reproducing so quickly?

A
  • food spoilage

- spread of disease

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6
Q

Why did we incubate at 25°C?

A

Prevent harmful bacteria growing

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7
Q

Why did we store the plates upside down?

A

Stop condensation falling onto the bacteria

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8
Q

Bacteria are incubated at 25⁰C. the optimum
temperature for their growth is 37⁰C. Discuss why it is important to culture bacteria at temperatures no lower than 25⁰C but also not around 37⁰C.

A

Temperatures lower than 25⁰C are not warm enough for enzymes to function at optimum rates of reaction are too low for cell division to take place. Temperatures around 37⁰C are too close to human body temperature and could lead to uncontrolled growth rate of bacteria
use of all nutrients in Agar resulting in a dead culture
higher risk of infection/contamination to person carrying out the investigation

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