Reactions Flashcards
What are the 4 main components of the air we breathe and the percentage of how much of each is actually in it
Oxygen - 21% Nitrogen - 78% Argon - 0.9% Carbon dyoxide - 0.037% Other - 0.063% Yo mama - 69%
Give three examples of uses of oxygen
Welding torches
Rocket fuel
Breathing apparatus
What is the word equation for respiration
Sugar + oxygen -> carbon dyoxide + water + energy
What chemical is used to test for the presence of water
Annydration copper sulphate, it changes colour from white to blue in presence of water
What are the chemicals used to create oxygen
Hydrogen peroxide - will decompose into oxygen over time
Manganese dyoxide catalyst - will speed up the decomposition
What is used to test for oxygen
Glowing splint - will relight in the presence of oxygen
What is an enzyme
Enzymes are soluble protien molecules that can speed up chemical reactions in cells
What are the two chemicals required to create hydrogen
Magnesium
Hydrochloric acid
What is the test for hydrogen
Squeaky pop
What was the Hindenburg disaster
Germany’s biggest airship the Hindenburg crashed and burst into flames while landing
Why did the Hindenburg crash
It is thought that that the outer skin was charged with static electricity and lighted the hydrogen inside
What are the chemicals required to create carbon dyoxide
Hydrochloric acid
Calcium carbonate
What is the test for carbon dyoxide
Bubble the gas into limewater, will turn from clear to milky white
What are the two types of reactions
Exothermic - give out heat (energy)
Endothermic - take in heat (energy)
