Question

5 maricruzs family goes on an autumn campout to a local state park. during her campout she notices several things that could be chemical changes. which of the following is not considered a chemical change? a leaves on the trees turning from green to red b the campfire turning wood into ashes c the clouds forming rain from water vapor d a marshmallow turning black on the outside when cooked over the campfire 6 which statement is most likely true in explaining the difference in these two pennies? image of two pennies a the penny on the left has collected dirt on its surface. b the penny on the right is not made of copper. c each penny was minted in a different location using different metal alloys. d the penny on the left has undergone a chemical change on its surface. 7 susan observes two attached bubbles in a liquid. bubbles immediately form. when will she know the chemical reaction has stopped? a when the bubbles have completely disappeared b when the temperature of the water begins to decrease c when a white substance begins to form at the bottom d when heat is produced from the water 8. which of the following pieces of lab equipment is needed to measure the amount heat energy released during a chemical change? images of lab equipment: balance, stopwatch, thermometer, microscope

Explanation:

Step1: Analyze Q5 (chemical vs physical change)

A chemical change forms new substances; physical change does not. Clouds forming rain is water vapor condensing to liquid water (no new substance).

Step2: Analyze Q6 (penny discoloration)

The left penny's dark appearance is tarnishing (copper reacting with air, a chemical change; dirt is physical, alloy location doesn't cause this, pennies are copper-based).

Step3: Analyze Q7 (chemical change indicator)

A chemical change produces new substances. A white solid forming is a new substance; bubbles dissolving, temp drop, heat alone don't confirm new substance.

Step4: Analyze Q8 (heat measurement tool)

A thermometer (option C) measures temperature, which correlates with heat energy released. Balance measures mass, stopwatch measures time, microscope observes small objects.

Answer:

1. C. the clouds forming rain from water vapor
2. D. The penny on the left has undergone a chemical change on its surface
3. C. when a white substance begins to form at the bottom
4. C. [the thermometer image option]