EXCEEDING ONLINE SCHOOL SCIENCE TEST

What is a mixture

• Two components chemically combined

• A combination of two or more components physically combined resulting to mass.

• A solute and a solvent

• Mixing of chemicals in an experiment

Define a solvent

• Mixed liquids and gases

• A liquid in which a solid dissolves to form a mixture

• A solid that breaks down solutions

• A homogeneous solution

Name a solute and a solvent in a salt solution mixture respectively.

• Salt and water

• Water and salt

• Sugar crystals

• Sodium chloride and water

Choose a combination showing some components in a mixture of air only

• N,02,Co2

• Co3,O2,O3

• No2,O2.CO2

• Mg,co3,No2

From the options below,choose a homogeneous liquid-liquid mixture

• Salt and water

• Sugar and salt

• Water and ethanol

• Water and sugar

Below are different temperature readings after an experiment. Choose a combination that shows melting points of pure and impure substances respectively

• 12⁰c and 47⁰c

• 0⁰ c and 51⁰c

• 0⁰c and 39⁰c

• 10⁰c and 0⁰c

Which one is true about melting points of pure and impure substances

• Both melting points are high

• Pure substances have a constant melting point of 0⁰c while impure substances have a range of different temperatures from 46⁰c and below 69⁰c

• Both melting points and boiling points are equal in the substances

• The higher the melting point,the lower the boiling point

Which one is an example of a heterogeneous liquid-liquid mixture.

• Sugar and water

• Salt and water

• Water and oil

• Sand and water

Inert gases are found in Air which is an example of gas-gas mixture,which one among the options below shows the other components of air correctly matched with their percantage composition

• N-78%, O2-21%, CO2-0.03%

• Co2-30%, NO2-70%

• O2-12%, Co2-21%, N-78%

• Ca-21%, N-78%, O2-21%

Which one is not among the information found on the packaging label

• Name of the owner

• Product Name

• Legal information

• Information on nutrients found in the product