SCIENCE 6 Mock Exam Part I

What is a mixture?

• a) A pure substance with a fixed composition
• b) Two or more substances physically combined, but not chemically bonded
• c) A substance formed by the combination of two elements

Which of the following is an example of a heterogeneous mixture?

• a) Saltwater
• b) Lemonade
• c) Trail mix nuts

When you mix sugar and water, which type of mixture is formed?

• a) Homogeneous mixture
• b) Heterogeneous mixture
• c) Compound

How can you separate a mixture of sand and salt?

• a) Boil the mixture
• b) Use a magnet
• c) Dissolve in water and filter

What method can you use to separate a mixture of oil and water?

• a) Filtration
• b) Distillation
• c) Evaporation

What is a solution?

• a) A mixture of two or more substances that are chemically bonded
• b) A mixture in which one substance is dissolved in another
• c) A pure substance with a fixed composition

Which of the following is an example of a solute in a solution?

• a) Water
• b) Salt
• c) The container holding the solution

When you mix sugar into a glass of water, what is the solvent?

• a) Sugar
• b) Water
• c) Both sugar and water

What happens at the molecular level when a solute dissolve in a solvent to form a solution?

• a) The solute molecules break apart into smaller particles.
• b) The solvent molecules combine to form new substances.
• c) The solute molecules become evenly distributed among the solvent molecules.

Which of the following factors can increase the rate at which a solute dissolve in a solvent?

• a) Increasing the particle size of the solute
• b) Stirring or agitating the solution
• c) Decreasing the surface area of the solute