Understanding Chemistry

Chemistry is a field of science that studies

• Interactions between matter

• Structure of matter

• Composition and properties of matter

• Live of matter

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-3

NGSS.HS-PS1-4

NGSS.HS-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

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

Tags

NGSS.MS-ETS1-1

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.

Tags

NGSS.HS-ETS1-3