science test(oxygen) Flashcards
(27 cards)
what’s the test for oxygen?
it relights and glowing splint
what’s the test for carbon dioxide|?
it turns lime water cloudy
what are the 3 things fire needs to burn?
oxygen ,heat ,fuel
what is burning?
burning is a chemical reaction where are substance reacts with oxygen ,releasing mostly heat energy
what gases is the air mostly made up with
nitrogen and oxygen
what does the atmosphere do?
- provides oxygen
- makes sound possible
- makes the sky blue
- protects us from falling stars
- keeps us warm(but not too warm)
describe the composition in the atmosphere?
nitrogen
oxygen
carbon dioxide
other mostly argon
name some uses for oxygen gas
submarines astronauts climbing aeroplanes medical
what is the scientific word fir burning?
combustion
what is combustion/burning
its a chemical reaction that reacts with oxygen, releasing mostly heat energy
what is essential for burning
fuel, oxygen, heat
when a substance burns and reacts with oxygen, what does it form?
makes chemicals called oxides
how can u tell that energy is released when something burns?
heat energy, sound energy, light energy
as the concentration of oxygen increases what happens to the rate of burning?
the rate of burning increases
whats the ozone layer?
a thin layer of gas that protects us from the suns heat
whats the greenhouse affect?
the process by which radiation from earths atmosphere warms the planets surface
name some sources of greenhouse gases
- burning fossil fuels
- transport
- heating
- live stock(cows)
- factories
what is photosynthesis ?
the process by which plants use carbon dioxide in the atmosphere to make their food (glucose)
write the word equation for photosynthesis
carbon dioxide +water -> glucose + oxygen
what is the role of chlorophyll in photosynthesis
absorbs the energy from the sun
what is chlorophyll?
the green pigment in plant cells
what is the test for starch?
test to see if it turns iodine solution black/blue
what are the optimum (the best) conditions for photosynthesis
high enough temperatures (hot, but not too hot)
light
enough water
significant amount of co2
what is a carbon footprint?
when greenhouse gases are released into the atomosphere
