5.6

Question 1

what is a displacement reaction

Answer 1

a reaction in which one element replaces another element in a compound

Question 2

what is observed when magnesium metal reacts with copper(II) sulfate

Answer 2

blue solution becomes colourless as magnesium sulfate is formed
brown metal is formed (copper)

Question 3

what species are oxidised and reduced in the reaction between copper(II) sulfate and magnesium metal

Answer 3

magnesium is oxidised
copper(II) is reduced

Question 4

define precipitation reaction

Answer 4

a reaction in which an insoluble solid is one of the products

Question 5

state the 3 examples of precipitate reactions being used a chemical tests

Answer 5

carbon dioxide - lime water produces a white precipitate calcium carbonate
sulfates - barium chloride/ barium nitrate produces white precipitate barium sulfate
halides - silver nitrate produce a precipitate silver halide

Question 6

what is observed in the reaction between lead nitrate and potassium iodide

Answer 6

colourless solution, yellow precipitate lead iodide formed

Question 7

how do acids react with metals and what type of reaction is it

Answer 7

metal + acid -> salt + hydrogen
neutralisation (H+ ions are removed from the solution) & redox reaction

Question 8

how do metal oxides and metal hydroxides react with acids

Answer 8

metal oxide/metal hydroxide + acid -> salt + water
formation of a solution
neutralisation reactions as H+ ions react with O2- / OH-

Question 9

how do acids react with metal carbonates & metal hydrocarbonates

Answer 9

metal carbonate + acid -> salt + water + carbon dioxide
neutralisation reaction as H+ ions react with CO3 2- ions

Question 10

how can solutions be tested to see if they are a carbonate or hydrocarbonate

Answer 10

add aqueous acid and test the gas given off with lime water