Exam (elaborations) CHEMISTRY PAPER 1

CHEMISTRY EXAM PAPER 1
hydrogen ions - CORRECT ANSWER-What are acids in solution a source of?

hydroxide - CORRECT ANSWER-What are alkalis in solution a source of?

7 - CORRECT ANSWER-What is the pH of a neutral solution?

low (less than 7) - CORRECT ANSWER-Do acidic solutions have high or low pH
values?

high (greater than 7) - CORRECT ANSWER-Do alkaline solutions have high or low pH
values?

alkaline - CORRECT ANSWER-Is this solution acidic or alkaline?

acidic - CORRECT ANSWER-Is this solution acidic or alkaline?

red - CORRECT ANSWER-Give the colour of methyl orange indicator when it is put into
an acidic solution

yellow - CORRECT ANSWER-Give the colour of methyl orange indicator when it is put
into an neutral solution

yellow - CORRECT ANSWER-Give the colour of methyl orange indicator when it is put
into an alkaline solution

colourless - CORRECT ANSWER-Give the colour of phenolphthalein indicator when it
is put into an acidic solution

colourless - CORRECT ANSWER-Give the colour of phenolphthalein indicator when it
is put into an neutral solution

pink - CORRECT ANSWER-Give the colour of phenolphthalein indicator when it is put
into an alkaline solution

it decreases - CORRECT ANSWER-What happens to pH when hydrogen ion
concentration increases?

it increases - CORRECT ANSWER-What happens to pH when hydrogen ion
concentration decreases?

it decreases by 1 - CORRECT ANSWER-What happens to pH as hydrogen ion
concentration in a solution increases by a factor of 10?

, a concentrated solution has a higher amount of substance dissolved in the solution -
CORRECT ANSWER-What is the difference between a concentrated and dilute
solution?

one that only partially dissociates into ions - CORRECT ANSWER-What is a weak
acid?

one that fully dissociates into ions - CORRECT ANSWER-What is a strong acid?

any substance that reacts with an acid to form a salt and water only - CORRECT
ANSWER-What is a base?

soluble bases - CORRECT ANSWER-What are alkalis?

salt + hydrogen - CORRECT ANSWER-Complete this equation: acid + metal -->

salt + water - CORRECT ANSWER-Complete this equation: acid + metal oxide -->

salt + water - CORRECT ANSWER-Complete this equation: acid + metal hydroxide -->

salt + carbon dioxide + water - CORRECT ANSWER-Complete this equation: acid +
metal carbonate -->

a lit splint causes a 'pop' - CORRECT ANSWER-What is the test for hydrogen?

lime water - CORRECT ANSWER-What is needed to test for carbon dioxide?

lime water turns cloudy - CORRECT ANSWER-What is the test for carbon dioxide?

a reaction between an acid and a base - CORRECT ANSWER-What is a neutralisation
reaction?

H+ + OH- → H2O - CORRECT ANSWER-Write a general equation for a neutralisation
reaction

titration - CORRECT ANSWER-What technique needs to be used if soluble salts are
prepared from an acid and a soluble reactant?

burette - CORRECT ANSWER-Name this piece of apparatus

pipette - CORRECT ANSWER-Name this piece of apparatus

they are all soluble - CORRECT ANSWER-What is true about common sodium,
potassium and ammonium salts?

true - CORRECT ANSWER-True or false: all nitrates are soluble