Reactions (Science)

Reactions (Science) (33 Cards)
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	Front cards	Back cards
1	2H2 +O2= ?	2H2O
2	Are chemical reactions reversible?	They aren’t normally.
3	Are the products on the left or right?	Right
4	Are the reactants on the left or right?	Left
5	Calcium + water= ?	Calcium hydroxide + hydrogen.
6	Is the catalyst used up in the reaction?	No, but it helps the reaction along.
7	Magnesium + Oxygen= ?	Magnesium Oxide.
8	What are changes of state?	They are not chemical reactions and are reversible this is because no new substances are made.
9	What are examples of fossil fuels?	Petroleum, diesel and coal.
10	What are fossil fuels?	Take millions of years to form, are non-renewable (finite) they also produce carbon dioxide and water.
11	What are physical changes?	Changes that’s don’t make new substances.
12	What are the substances in a reaction called?	Reactants
13	What can cause climate change?	Extra carbon-dioxide in the air.
14	What can hydrogen do?	Can also be combusted and used for fuel, this can be a solution as it only produces water as a product.
15	What can we represent a reaction with?	Word equation
16	What can we use to represent an equation?	Balanced formula
17	What do all chemicals reactions involve?	An energy transfer to or from the surroundings.
18	What do different reactions require?	Different catalysts.
19	What does a balanced formal equation show?	The formula of each substance in reaction, how the atoms are re-arranged and the relative number (ratio) of atoms of each substance.
20	What does adding a catalyst do to a reaction?	It can speed up a reaction for example making a product quicker.
21	What happens to atoms in a reaction?	They are not created or distorted they are just rearranged.
22	What is a chemical reaction?	Is a change In which atoms re-arrange and join together differently to create new substances.
23	What is an endothermic reaction?	The energy is transferred from the surroundings to the reaction mixture, the temperature decrease and an example is thermal decomposition.
24	What is an exothermic reaction?	The energy is transferred to the surroundings from the reaction mixture, the temperature increases and an example is combustion.
25	What is combustion?	Type of oxidation reaction when a fuel reacts (burns) with oxygen, this transfers energy by heating.
26	What is conservation of mass?	The total mass of the reactants is always equal to the total mass of the products.
27	What is happening if the mass increases?	The atoms have rearranged and formed a gas that has escaped.
28	What is happening if the mass seems to increase?	The atoms have been added from a gas.
29	What is in-between the reactants to the products?	An arrow
30	What is oxidation?	When substances react with oxygen.
31	What is thermal decomposition reaction?	When a substance breaks down into simpler substances, most decomposition reactions need heat to happen this is called thermal decomposition.
32	What might you see in a chemical reaction?	Flames or sparks, notice a smell, hear a fizzing or bang, feel a drastic temperature change.
33	What speed can reactions be?	Very fast or very slow.