WorksheetsPHSC GR 8 June Exam Revision
Total questions: 20
Worksheet time: 10mins
What are considered to be the building blocks of matter?
Molecules
Atoms
Elements
Compounds
Which sub-atomic particle carries a negative charge?
Proton
Neutron
Electron
Nucleus
Which of the following is an example of a pure substance?
Air
Salt water
Gold
Soil
What do you call a mixture that contains two or more elements chemically combined in a fixed ratio?
Homogeneous mixture
Compound
Heterogeneous mixture
Solution
According to the particle model of matter, particles are always in:
Random motion
Fixed positions
Solid state
Liquid state
What is the particle model of matter?
A model describing the behavior of atoms and molecules in matter
A model describing the formation of stars and galaxies
A model explaining the behavior of sub-atomic particles
A model describing the structure of the nucleus
Which state of matter has a definite shape and volume?
Solid
Liquid
Gas
Plasma
What is the process called when a gas changes into a liquid?
Evaporation
Condensation
Sublimation
Deposition
Which of the following is the correct formula for density?
Density = Volume / Mass
Density = Mass / Volume
Density = Mass × Volume
Density = Volume + Mass
How does the density of a substance change when it changes from a solid to a liquid?
Increases
Decreases
Remains the same
Depends on the substance
Which material has the highest density?
Wood
Plastic
Iron
Foam
What happens to most materials when they are heated?
Contract
Expand
Melt
Solidify
Which of the following indicates a chemical reaction has occurred?
Change in color
Production of gas
Formation of a precipitate
All of the above
What are the substances that undergo a chemical reaction called?
Solvents
Products
Reactants
Catalysts
In a chemical reaction, what are the new substances formed called?
Reactants
Products
Solvents
Precipitates
What sub-atomic particle is found in the nucleus of an atom and carries a positive charge?
Neutron
Electron
Proton
Ion
Which of the following is an example of a heterogeneous mixture?
Salt water
Air
Salad
Lemonade
When a gas changes directly into a solid without passing through the liquid state, what is this process called?
Sublimation
Deposition
Condensation
Evaporation
What happens to the volume of a substance when it is cooled?
Increases
Decreases
Remains the same
Varies unpredictably
Which one of the following represents molecules of a compound?
