Chemistry Lessons

Chemistry is a field of science that studies

• Interactions between matter

• Structure of matter

• Composition and properties of matter

• Live of matter

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which one is not a Chemistry career?

• Lecturer

• Farmer

• Actuary

• Anesthetist

These chemicals are used in food processing except..

• Sodium chloride

• Sodium sulphate

• Carbon dioxide

• Sodium bicarbonate

What are the variables of the experiment?

• Manipulated variable: Types of salt,

  Responding variable: Solvent,

  Constant variable: Solubility of salt

• Manipulated variable: Types of salt,

  Responding variable: Solubility of salt,

  Constant variable: Solvent

• Manipulated variable: Types of salt,

  Responding variable: Solubility of salt,

  Constant variable: Rate of stirring

• Manipulated variable: Rate of stirring,

  Responding variable: Solubility of salt,

  Constant variable: Solvent

Tags

NGSS.HS-PS1-5

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

• (i) Solvent and

  (ii) Mass of sodium chloride

• (i) Solute and

  (ii) Volume of solvent

• (i) Solute and

  (ii) Rate of stirring

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.