science test(oxygen)

Question 1

what’s the test for oxygen?

Answer 1

it relights and glowing splint

Question 2

what’s the test for carbon dioxide|?

Answer 2

it turns lime water cloudy

Question 3

what are the 3 things fire needs to burn?

Answer 3

oxygen ,heat ,fuel

Question 4

what is burning?

Answer 4

burning is a chemical reaction where are substance reacts with oxygen ,releasing mostly heat energy

Question 5

what gases is the air mostly made up with

Answer 5

nitrogen and oxygen

Question 6

what does the atmosphere do?

Answer 6

• provides oxygen
• makes sound possible
• makes the sky blue
• protects us from falling stars
• keeps us warm(but not too warm)

Question 7

describe the composition in the atmosphere?

Answer 7

nitrogen
oxygen
carbon dioxide
other mostly argon

Question 8

name some uses for oxygen gas

Answer 8

submarines
astronauts
climbing
aeroplanes
medical

Question 9

what is the scientific word fir burning?

Answer 9

combustion

Question 10

what is combustion/burning

Answer 10

its a chemical reaction that reacts with oxygen, releasing mostly heat energy

Question 11

what is essential for burning

Answer 11

fuel, oxygen, heat

Question 12

when a substance burns and reacts with oxygen, what does it form?

Answer 12

makes chemicals called oxides

Question 13

how can u tell that energy is released when something burns?

Answer 13

heat energy, sound energy, light energy

Question 14

as the concentration of oxygen increases what happens to the rate of burning?

Answer 14

the rate of burning increases

Question 15

whats the ozone layer?

Answer 15

a thin layer of gas that protects us from the suns heat

Question 16

whats the greenhouse affect?

Answer 16

the process by which radiation from earths atmosphere warms the planets surface

Question 17

name some sources of greenhouse gases

Answer 17

• burning fossil fuels
• transport
• heating
• live stock(cows)
• factories

Question 18

what is photosynthesis ?

Answer 18

the process by which plants use carbon dioxide in the atmosphere to make their food (glucose)

Question 19

write the word equation for photosynthesis

Answer 19

carbon dioxide +water -> glucose + oxygen

Question 20

what is the role of chlorophyll in photosynthesis

Answer 20

absorbs the energy from the sun

Question 21

what is chlorophyll?

Answer 21

the green pigment in plant cells

Question 22

what is the test for starch?

Answer 22

test to see if it turns iodine solution black/blue

Question 23

what are the optimum (the best) conditions for photosynthesis

Answer 23

high enough temperatures (hot, but not too hot)
light
enough water
significant amount of co2

Question 24

what is a carbon footprint?

Answer 24

when greenhouse gases are released into the atomosphere

Question 25

name some things that contribute to the carbon footprint

Answer 25

transport, electricity, burning fossil fuels, eating red meat

Question 26

what is respiration

Answer 26

chemical reaction that happens in living cells that turns glucose and oxygen into carbon dioxide and water

Question 27

what is the word equation for respiration

Answer 27

glucose + oxygen -> carbon dioxide + water