Which of the following statements best describes a mixture?

• The combination of two substances in different physical states

• A nonchemical combination of two or more substances

• A chemical combination of two or more substances

• A substance composed of only one type of atom or molecule

In an experiment, a student added sodium acetate to a fixed volume of water. Eventually, the student reached a point at which no more sodium acetate dissolved. The student then warmed the solution until no crystals of sodium acetate were visible. The solution was then allowed to cool slightly. The diagram below shows the student’s observations.

Which of the following terms describes solution C ?

• Saturated

• Supersaturated

• unsaturated

• Crystallization

Three different solutions are shown. Which solution contains a strong electrolyte?

• A

• B

• C

the water is considered ------------

• strong electrolyte

• weak electrolyte

• non-electrolyte

All the following mixtures represent a state between true solution & suspension except:

• paints

• blood

• chalk in water

• creams

which of the following has the highest electric conductivity if they have the same concentration?

• Acetic acid

• sulphuric acid

• hydrochloric acid

• nitric acid

Which of the following substances or phenomena is an example of a gel: a liquid dispersed through a solid?

• Blood

• Milk

• Agar

• Whipped cream

Which of the following substances or phenomena is an example of a solid foam: a gas dispersed through a solid?

• Whipped cream

• Air

• Marshmallow

• Smoke

Order the following mixtures according to the size of the particles found in them, from smallest to largest.

• Solutions, suspensions, colloids

• Solutions, colloids, suspensions

• Suspensions, colloids, solutions

• Colloids, solutions, suspensions

• Colloids, suspensions, solutions

Mercury solutions with other metals are known as ___________

• Amalgam

• Saturated solution

• alloys

• solid-solid solution