Science Review - pt2

Tyrell makes salad dressing. He puts 150 mL of oil and 150 mL of vinegar in a jar and shakes it. After 5 minutes, the oil is on top of the vinegar. What can Tyrell conclude about the salad dressing?

• Oil is a solvent and vinegar is a solute.
• More oil is needed to dissolve the vinegar.
• The oil and vinegar have formed a mixture.

Physical changes happen when a substance changes, but its composition doesn't. Which of the following is a physical change?

• burning
• freezing
• decaying

Which of the following is the ability to cause change in matter?

• Energy
• freezing
• decaying

.. Of a compost pile is a clue that waste is rotting to form new substances. What is it?

• Smell
• Change of shape
• Change of size

An increase in temperature often speeds up a chemical reaction.

• Increase in temperature
• Decrease in temperature
• Temperature has no effect

The inner and outer planets can be grouped according to their characteristics.

• True
• False

Which of these does not apply to the outer planets?

• Densest planets
• Very cold temperatures
• Gases surrounding a solid core

Reem gets a new silver bracelet. After a few days, the bracelet tarnishes and leaves a black ring on Ivan's arm. What type of change does the bracelet undergo?

• A. Chemical change
• B. Matter change
• C. Physical change

Which of the following is a solution?

• A. Sugar and water
• B. Sand and water
• C. Muddy water

The substance that dissolves a solute.

• A. Mixture
• B. Solvent
• C. Solution