When does heat produce a chemical change? When heat energy is transferred.
When heat changes ice into liquid water.
When heat changes the chemical composition of an object.
When heat is observed in an experiment.

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

After watching the video "zinc strip in copper nitrate solution", and reading the instructions, click on the link labeled "start" just below the drawing of the pencil tip. follow the direction to complete the 3x3 grid. answer the below questions for the portion of the activity in which sn(s) is placed in agno3(aq)

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?