Chemistry is a field of science that studies
Interactions between matter
Structure of matter
Composition and properties of matter
Live of matter
Which one is not a Chemistry career?
These chemicals are used in food processing except..
What are the variables of the experiment?
Manipulated variable: Types of salt,
Responding variable: Solvent,
Constant variable: Solubility of salt
Responding variable: Solubility of salt,
Constant variable: Solvent
Constant variable: Rate of stirring
Manipulated variable: Rate of stirring,
An experiment is carried out to study the solubility of sodium chloride in water and in benzene. What is the
(i) manipulated variable and
(ii) constant variable
of the experiment?
(i) Solvent and
(ii) Rate of stirring
(ii) Mass of sodium chloride
(i) Solute and
(ii) Volume of solvent
Which of the following affects the amount of sodium chloride that can dissolve in water?
Volume and temperature of water
Rate of stirring and size of sodium chloride
Volume, rate of stirring and size of sodium chloride
Volume, size of sodium chloride and temperature of water
Which of the following symbols represents an oxidizing agent?
What precaution must be taken when storing a chemical with this label?
Store it in a dark place
Store it in a fume cupboard
Store it in a locked cupboard
Store it away from any Bunsen burner
When heating solution in a boiling tube, what precaution must you take?
Heat the solution too strongly
Hold the boiling tube vertically
Never use a Pyrex boiling tube to heat the solution
Never direct the mouth of the boiling tube at your classmates
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 oxidising chemicals.
Why is it important to understand the experimental procedures before carrying out the experiment?
The answer more than one
To prevent wastage of chemicals
To prevent accidents from happening
To prevent the repetition of the experiment
To know what apparatus is needed to carry out the experiments
What are the benefits for our country from producing chemicals locally?
The government can collect tax from chemical export
The people can build residential places nearby
The industry provides job opportunities
The country save on foreign exchange
What is the purpose of wearing gloves during experimenting?
Protect hands from sharp objects
Protect hands from volatile liquid
Protect hands from chemicals or infection
Protect hands from fire
The following equipment is safety equipment in the laboratory except
Reactive metals Q must be stored in the paraffin oil to prevent reaction with the moisture in the air. What is Q?