chapter 4 acids and redox

Question 1

what is an acid?

Answer 1

released H+ ions in aqueous solution

Question 2

What is a base?

Answer 2

compound that neutralises an acid to form a salt

Question 3

what is an alkali?

Answer 3

type of base that dissolves in water to release OH- ions

Question 4

What are metal oxides, metal hydroxides, metal carbonates and ammonia classified as?

Answer 4

a base

Question 5

what can titrations be used for?

Answer 5

finding the concentration of a solution, identification of unknown chemicals, finding the purity of a substance.

Question 6

what is a standard solution?

Answer 6

solution of known concentration

Question 7

what equipment is used for an acid base titration?

Answer 7

burette and pipette

Question 8

what are the special cases for oxidation numbers?

Answer 8

H in metal hydrides is -1 (e.g. NaH), O in peroxides is -1 (e.g. H2O2), O bonded to F is +2(e.g. F2O)

Question 9

What are the definitions of oxidation and reduction?

Answer 9

oxidation: loss of electrons/addition of oxygen/increase in oxidation number.
reduction: gain of electrons/removal of oxygen/decrease in oxidation number.