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  • Created by: tyndsei
  • Created on: 18-05-16 11:17
How do you reduce electricity?
Turn off the heat at home. Insulating our homes. Turn off the lights when you leave the room. Use low energy saving bulbs. Use renewable resources
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How did the Earth form today?
Early atmosphere was mostly CO2 and water vapour. Oceans were formed when the WV condensed when the Earth cooled.
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How do plants produce oxygen?
CO2 dissolved in oceans. The plants could remove CO2 from the air and produce O2 by photosynthesis. The decay of plants were buried underground in sedimentary rocks and formed fossil fuels
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How is human activity change the atmosphere?
Adding small pollutants of CO2, CO, particulates, SO2 and NO from power stations, cards, deforestation and burning fossil fuels
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How do pollutants harm humans and the environment?
Directly harmful to humans: CO reduces amount of oxygen the blood can carry leading to death. Indirectly: SO2 causes acid rain which pollutes rivers killing fish that we eat. CO2 leads to climate change, rising sea levels and disruption to farming
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Define atoms
Substances made from tiny particulates
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Define molecules
When atoms are bonded together
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What are some materials that occur naturally?
From plants: wood/paper from trees & cotton from cotton plants. From animals: wool from sheep, silk made by silkworm larva & leather from cows
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What are the properties of materials and their different properties?
MELTING POINT: how high the temperature can vary before solid turns to liquid or the opposite. STRENGTH: resisting a force (tensile or compressive). STIFFNESS: not able to bend (steel vs rubber) HARDNESS: difficult to cut (diamond). DENSITY: mass
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Uses of materials depending on their properties?
PLASTICS are hard, strong and stiff with low density and mouldable (tv/computers/kettles). RUBBER: strong but soft and flexible (car tyres). NYLON: soft and flexible with tensile strength (ropes and clothing)
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What is crude oil?
A mixture of hydrocarbons. Molecules that are made of carbon and hydrogen atoms only.
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What are nanomaterials?
Tiny particles, 1-100 nanometers across called nanoparticles
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What are nanomaterials often designed for?
Added to plastics in sport equipment (tennis rackets/golf balls) to be more strong and durable, they don't add weight. Added to POLYMER fibres for surgical masks and wound dressing. HEALTHCARE: sunscreens
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What are the effects of nanoparticles on health?
They're not fully understood, it's important that they are tested thoroughly to minimise risks. Long term impacts aren't known , people believe that products containing nanoparticles should be clearly labelled.
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Other cards in this set

Card 2

Front

How did the Earth form today?

Back

Early atmosphere was mostly CO2 and water vapour. Oceans were formed when the WV condensed when the Earth cooled.

Card 3

Front

How do plants produce oxygen?

Back

Preview of the front of card 3

Card 4

Front

How is human activity change the atmosphere?

Back

Preview of the front of card 4

Card 5

Front

How do pollutants harm humans and the environment?

Back

Preview of the front of card 5
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