definitions

Question 1

what is an ion

Answer 1

an ion is an electrically charged atom or group of atoms formed by the loss or gain of electrons

Question 2

what is an aqueous solution

Answer 2

an aqueous solution is a solution in which water is the solvent (dissolved solution)

Question 3

what is a combustion reaction

Answer 3

fuel is burned and reacts with oxygen to release energy(heat), so they will always be exothermic reactions

Question 4

what are groups in the periodic table

Answer 4

show how many electrons are on the outer shell e.g. in group one the atoms will have one electron on their outer shell so therefore will have the charge of +1

Question 5

what are periods in the periodic table

Answer 5

•horizontal rows
•show how many shells the atom has e.g. in period 3 the atoms will have 3 shells therefore will have the configuration of (2:8:_)

Question 6

what does pure mean

Answer 6

consists only of one substance/atom, one element or one compound

Question 7

what does impure mean

Answer 7

more than one type of substance/atom (usually a mixture)

Question 8

what’s the definition of an acid

Answer 8

•H+ (hydrogen ions) donor (when placed in aqueous solutions)
•proton donor
•have a pH bellow 7

Question 9

what is the definition of an alkali

Answer 9

•OH- (hydroxide ions) donor (when placed in aqueous solutions)
•proton acceptors
•have a pH above 7