Alculate the heat change in calories for freezing 40 g of water at 0 ∘C . Express your answer as a positive value using two significant figures and include the appropriate units.

2.0 cal

3200 cal

0.50 cal

40.0 ca

When an object falls through the air and encounters air resistance its overall speed will be than if it had not encountered air resistance? (one word answer)

An animal cell loses the ability to convert energy stored in food to energy that the cell can use. which of the cell's organelles has stopped working? a.the mitochondria b.the nucleus c.the vacuoles d.the endoplasmic reticulum

Atoms contain subatomic particles called protons and neutrons. when these protons and neutrons spilt, a lot of energy is released