Grade 8 Science Final Exam Study Questions and Answers

What is Particle Theory?

• All matter is made of tiny moving particles with spaces between them that attract each other.

• It is the idea that all matter is made of continuous, unbroken substances.

• It states that matter is made only of energy and not particles.

• It is the theory that particles are stationary and do not move.

What is a solvent and a solute?

• A solvent dissolves things (like water); a solute is what gets dissolved (like sugar).

• A solvent is always a solid; a solute is always a liquid.

• A solute dissolves things (like water); a solvent is what gets dissolved (like sugar).

• A solvent and a solute are both always gases.

What are heterogeneous and homogeneous mixtures?

• Heterogeneous mixtures have different visible parts (like salad); homogeneous mixtures look the same throughout (like salt water).

• Heterogeneous mixtures are always gases; homogeneous mixtures are always solids.

• Heterogeneous mixtures cannot be separated; homogeneous mixtures can be separated easily.

• Heterogeneous mixtures are only found in nature; homogeneous mixtures are only man-made.

What is density and viscosity?

• Density is how much mass is in a certain volume. Viscosity is how thick or runny a liquid is.

• Density is the color of a substance. Viscosity is its temperature.

• Density is how fast a liquid flows. Viscosity is how much it weighs.

• Density is the shape of an object. Viscosity is its size.

What are the steps of the scientific method?

• Ask a question, make a hypothesis, experiment, observe and record, analyze data, and draw a conclusion.

• State a fact, guess the result, skip experimentation, and publish findings.

• Make a prediction, ignore data, draw a conclusion, and repeat the process.

• Ask a question, make a guess, avoid experiments, and accept any result.

What is saturation, supersaturation, and unsaturation?

• Saturated means no more solute can dissolve. Unsaturated means more can dissolve. Supersaturated means more than usual has dissolved.

• Saturated means more solute can dissolve. Unsaturated means no solute can dissolve. Supersaturated means less than usual has dissolved.

• Saturated means the solution is always solid. Unsaturated means the solution is always liquid. Supersaturated means the solution is always gas.

• Saturated means the solution is colored. Unsaturated means the solution is colorless. Supersaturated means the solution is transparent.

What is buoyancy and how do things float?

• Buoyancy is the upward force that makes things float. Objects float if they are less dense than the fluid.

• Buoyancy is the downward force that makes things sink. Objects float if they are more dense than the fluid.

• Buoyancy is the sideways force that moves things in water. Objects float if they are heavier than the fluid.

• Buoyancy is the force that only affects gases. Objects float if they are solid.

How do solids, liquids, and gases move?

• Solid particles vibrate in place, liquid particles slide past each other, and gas particles move freely and quickly.

• Solid particles move freely, liquid particles vibrate in place, and gas particles slide past each other.

• Solid particles slide past each other, liquid particles move freely, and gas particles vibrate in place.

• Solid particles and liquid particles both move freely, while gas particles vibrate in place.

What is WHMIS?

• Workplace Hazardous Materials Information System—Canada’s safety system for hazardous materials.

• World Health Management Information System—A global health database.

• Workplace Health Monitoring and Inspection Service—A Canadian inspection agency.

• Western Hemisphere Material Inventory System—A North American inventory program.

What are cell organelles and what do they do?

• Organelles are parts of a cell (like nucleus, mitochondria) with special jobs to keep the cell alive.

• Organelles are types of bacteria that attack cells.

• Organelles are chemicals that help digest food in the stomach.

• Organelles are the outer covering of the cell that protects it from viruses.