Worksheets1.3 Incorporate scientific attitudes and values
Total questions: 10
Worksheet time: 5mins
When heating a solution in a boiling tube, what precaution must you take?
Never heat the solution too strongly
Never hold the boiling tube vertically.
Never point the boiling tube at your classmates.
Never use a Pyrex boiling tube to heat the solution.
What precaution must you take when diluting a concentrated acid?
Add the concentrated acid to water.
Add water to the concentrated acid.
Mix equal volumes of the concentrated acid and water together.
Mix one volume of concentrated acid to three volumes of water together.
Which of the following experimental procedures is wrong?
Preparing copper(II) sulphate solution in a fume cupboard.
Recording experimental result immediately
Filling a pipette using a pipette filler
Adding concentrated acid to water.
An experiment should be carried out in the fume cupboard if it involves
the release of poisonous gas.
the release of flammable gas.
the use of corrosive chemicals.
the use of oxidizing chemicals.
What precaution must you take when storing poisonous chemicals?
Store it in a dry place
Store it in a dark place
Store it in a locked cupboard
Store it away from the Bunsen burner
Sulphur trioxide (SO3) is used as a food preservative in jams.
Its function is to
give the food an acidic taste.
slow down the rotting of food
give the food a smooth texture
prevent the food from being oxidized in the air
Chemists have invented a lightweight and strong material called fiberglass which is used to make rackets and body of racing cars.
Fiberglass is an example of
alloy
ceramic
plastic material
composite material
Formic acid (HCOOH) is used in the rubber industry to
prevent the rubber turning yellow
ensure the rubber remain elastic
prevent oxidation of rubber
coagulate the latex
Which of the following methods to separate the mixtures in petroleum?
Fractional distillation
Recrystallisation
Chromatography
Freezing
Forests in Scandinavian countries are destroyed by acid rains caused by chemical industries.
The chemical that is used to neutralize the acidity in the soil is
limestone
dolomite
calcium hydroxide
sodium hydroxide
