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Chemistry > Chem L > Flashcards

Chem L Flashcards

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1
Q

What is the haber process?

A

The Haber process (named for Fritz Haber) is an industrial process used to form ammonia from hydrogen and nitrogen.

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2
Q

what are the haber conditions

A

400 - 450 c

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3
Q

what are the reactants in the haber process?

A

nitrogen in the air. Hydrogen from natural gas (reacting methane with steam)

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4
Q

what are NPK fertilisers?

A

nutrients are nitrogen, phosphorous and potassium

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5
Q

What does enriching the soil mean?

A

by using animal manure, using natural deposits of minerals and adding synthetic fertililers

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6
Q

what is the life cycle assessment?

A

An evaluation of the environmental impact a product has over its lifetime.

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7
Q

what are the four stages in the LCA?

A
  1. extracting and processing raw materials
  2. manufacturing and packaging
  3. use and operation during its lifetime
  4. disposal at the end of its useful life, including transportation and distribution
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8
Q

why is recycling important?

A

recycling materials uses less energy. This means that we can also reduce the amount of waste and pollution.

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9
Q

how can waste water and sewage be treated?

A
  • Firstly, filtered to remove large particles and is left so that sediment drops to the bottom. The “sludge” at the bottom is then anaerobically digested (broken down by bacteria) to make methane gas. Any remaining effluent is broken down by aerobic respiration. The water is then released back into rivers and lakes.
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10
Q

what do you call water that is safe to drink?

A

potable water

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11
Q

how do you do the potable water practical

A
  1. use universal indicator to test pH of the water
  2. measure and record the mass of an empty evaporating basin
  3. pour 10 cm3 water into the evaporating basin and evaporate the water using a bunsen burner until most of the water has evaporated.
  4. once evaporating basin is cool reweigh and record the change in mass
  5. calculate the mass of dissolved solids
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12
Q

what is phytomining?

A

it uses plants to absorb metal compounds. the plants are harvested and burned to get ash which contains a metal.

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13
Q

what is bioleaching?

A

uses bacteria to produce leachate solutions that contain metal compounds

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14
Q

what is corrosion?

A

it is the destruction of materials by chemical reactions with substances in the environment. Ex: rusting

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15
Q

how do you prevent corrosion?

A
  • applying a coat that acts as a barrier
    Ex: painting or electroplating
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Chemistry (11 decks)

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