Which is an example of a chemical change?

a) frying an egg
b) boiling water
c) melting butter
d) chopping onions

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the refrigerator if it released 380j of energy to the room?

Consider two regions of space containing a static electric field, region a and region b. in region a the equipotential lines are more closely spaced than those in region b. what can be said about the relative strength of the electric field in the two regions? a) the electric field in region a is stronger th