chap 4 HW

Question 1

what should you watch out for

Answer 1

.always diatomic’s/multiple of same element in compound share charge that adds up
.when giving witch reduced and which oxidized give the element chosen in it’s monatomic form
.and don’t include coefficient when trying to work out how charge is shared

Question 2

Answer 2

Question 3

oxidising agent

Answer 3

A chemical species that gains electrons and is reduced in a chemical reaction, (electron acceptor)

Question 4

redox reaction

Answer 4

oxidation and reduction in the same reaction (check if it ask’s for refrence of oxidation number’s

Question 5

state an observation for reaction of Ba and water

Answer 5

effervescence

Question 6

Ba + H2O

Answer 6

Ba(OH)2. balance ( Ba + 2H2O —> Ba(OH)2 + H2 )

Question 7

ionic equation

Answer 7

.exclude spectator ions , (check for Q asking for ‘state symbols’)
e.g Ba(aq)^2+ + SO4(aq)^2- arrow > BaSO4(s)

Question 8

c = 0.0566

Answer 8

Question 9

Answer 9

Question 10

what would you do if you vol is 25cm^3

Answer 10

I would work out moles and * it by the up-scaled volume

Question 11

what is the titre

Answer 11

the amount or volume of the solution used to reach the endpoint of a titration. (the concentration of the reactant that where trying to figure out). (the one after the molar ratio)

Question 12

once you work out the moles with the titre, what do you do?

Answer 12

you can do: n * ((diluted v)/(pure v)) = c of pure/original

Question 13

Predicting Precipitation Reactions

Answer 13

Use the solubility rules to predict whether a reaction will produce a precipitate. If you mix two solutions containing ions that can form an insoluble salt, a precipitation reaction may occur. Look for combinations of cations and anions that can form insoluble salts based on the solubility rules.