Unit 9 - Ch 7 CKLA (8 pts)

What activity does Tess suggest to make the evening more enjoyable?

• Playing a game to identify chemical changes
• Singing songs around the campfire
• Telling ghost stories
• Going on a night hike

What is a sign of a chemical change when wood burns?

• It makes a loud noise
• It changes color without heat
• It can easily be reversed
• It produces heat and light

Why can't you 'untoast' marshmallows, according to the discussion?

• Because it's a chemical change
• Because it's too cold
• Because it's a physical change
• Because it doesn't involve heat

What chemical change occurs when you digest marshmallows?

• No change occurs in the body
• Compounds are rearranged into different molecules
• Marshmallows revert back to their original form
• Marshmallows turn into a gas

What causes the tarnishing of a silver ring?

• Lack of cleaning
• Exposure to sulfur-containing compounds in the air
• Exposure to sunlight
• Rubbing with a cloth

What is Amy's plan to catch the fossil thief?

• Asking everyone directly
• Searching all the tents
• Calling the police
• Using chemistry to identify the culprit

How does Amy use ice in her trap to catch the thief?

• To keep the fossils preserved
• To make the ground wet and capture footprints
• To cool down the area
• To throw at the thief

What will happen when the plaster of Paris mixes with water on the thief's shoes?

• It will evaporate
• It will become less effective
• It will change color
• It will harden and capture the footprint