P1 2d reactivity series

Question 1

reactivity series

Answer 1

Please - potassium 
Stop - sodium 
Caling - calcium 
Me - magnesium 
A - aluminium 
Careless - (carbon)
Zebra - zinc 
Inseatd - iron 
Try - tin 
Learning - lead 
How - (hydrogen)
Copper - copper 
Saves - silver 
Gold - gold

Question 2

what metals react with water/steam, in the reactivity series?

Answer 2

metals above hydrogen in the reactivity series

- metals below hydrogen do not react with water or steam, which is why copper can be used in both hot and cold pipes

Question 3

what is the reaction for metal and cold water?

Answer 3

metal + cold water -> metal hydroxide + hydrogen

Question 4

what is the reaction for metal and steam?

Answer 4

metal + steam -> metal oxide + hydrogen

Question 5

what is displacement?

Answer 5

when something more reactive takes over the less reactive element

Question 6

what reactants equal the products salt and hydrogen?

Answer 6

metal + acid -> salt + hydrogen

Question 7

what conditions does iron rust in?

Answer 7

iron can only rust in both water and oxygen

salt can speed up rusting

Question 8

what does oxidation mean in terms of oxygen and electrons?

Answer 8

when something gains oxygen the element has been oxidised (in terms of oxygen)
when something loses electrons it has been oxidised (in terms of electrons)

Question 9

what does reduction mean in terms of oxygen and electrons?

Answer 9

when something loses oxygen it has been reduced (in terms of oxygen)
when something gains electrons it has been reduced (in terms of electrons)

Question 10

what is a redox reaction?

Answer 10

when both reduction and oxidation takes place at the same time

Question 11

what is rust?

Answer 11

hydrated iron oxide

Question 12

how do barrier methods work and what are some examples?

Answer 12

it puts a barrier in between the metal and the air and moisture
examples are oil, paint, covering with plastic

Question 13

how does sacrificial protection work?

Answer 13

an element more reactive than iron and lose their electrons in preference to iron.

Question 14

how does galvanising work?

Answer 14

when iron is coated in a thin layer of zinc, it oxidises in preference to the iron object

Question 15

how does galvanising work?

Answer 15

when iron is coated in a thin layer of zinc, it oxidises in preference to the iron object
stops oxygen and water reaching the metal underneath