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