A55.0-g piece of copper wire is heated, and the temperature of the wire changes from 19.0°c to 86.0°c. the amount of heat absorbed is 343 cal. what is the specific heat of copper? show your work.

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

Areaction is first order with respect to reactant x and second order with respect to reactant y. which statement describes the rate law for this reaction?