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WorksheetsGCSE Chemistry: Paper 2 RPA
Total questions: 34
Worksheet time: 31mins
You can measure rate of reactions via a change in mass and what other method?
(a)
What best describes the apparatus for the 'disappearing cross test'?
Stopwatch, ruler, bung, conical flask, cross
Data logger, cross, sodium carbonate, conical flask
Sodium thiosulfate, HCl, stopwatch, conical flask
Sodium diosulfate, HCl, stopwatch, bung, conical flask
What is the missing piece of equipment from the measuring gas experiment?
Conical flask, magnesium, HCl, stopwatch, bung (a)
What is the independent variable in both RPA's?
(a)
Check each correct control variable for disappearing cross
Time
Concentration of HCl
Mass and concentration of sodium thiosulfate
Same person viewing the experiment
What piece of equipment makes the results of the experiment more accurate?
(a)
Why is a gas syringe used?
They are cheap
They have high resolution so usually quite accurate
They remove chance of human error
No gas goes to waste
In paper chromatography, what is the mobile phase?
(a)
What are the two reasons that different substances have different Rf values?
They are more or less dilute
They are more or less soluble
They are more or less attracted to the paper
They react better or worse with water
What should be used to draw the baseline?
(a)
At the start, where should the water sit: above or below the baseline?
(a)
Rf is equal to what?
distance travelled by solvent/distance travelled by substance
distance travelled by substance/distance travelled by solvent
distance travelled by solvent x distance travelled by substance
distance travelled by substance x 1/distance travelled by solvent
What substance is added to a carbonate to test it?
(a)
The products of the reaction between the acid and carbonate are bubbled through what?
(a)
What is added to a sulfate ton test it?
(a)
What is added to the sulfate-barium chloride solution to make the reaction happen?
(a)
What forms as the positive result from the sulfate test?
(a)
To identify a halide ion, what do you add?
dilute nitrate acid followed by silver chloride solution
dilute nitric acid followed by barium chloride solution
dilute nitric acid followed by silver carbonate solution
dilute nitric acid followed by silver nitrate solution
What is the positive test for bromide?
(a)
What is the positive test for iodide?
(a)
What is the positive test for chloride?
(a)
Before flame tests, what is used to put a sample in the flame? write as: a (x) (x) loop
(a)
What do you use to clean the metal loop?
(a)
Positive flame test for potassium?
(a)
Positive flame test for lithium?
(a)
Positive flame test for sodium?
(a)
Positive flame test for calcium?
(a)
Positive flame test for copper?
(a)
What is added to other metal ions to identify them?
(a)
What are the colours of the precipitates of calcium, magnesium and aluminium?
(a)
What does aluminium do unlike the others?
Explode
Turn red
Redissolve
What is the positive test for iron (II)?
(a)
What is the positive test for iron (III)
(a)
What is the positive test for copper hydroxides?
(a)
