Which process is exothermic?

(1) boiling of water

(2) melting of copper

(3) condensation of ethanol vapor

(4) sublimation of iodine

1. For each of your three trials state the following: • heat needed to melt the ice (q) • enthalpy of fusion • percent error from the accepted enthalpy of fusion of water of 334 J/g Answer:

According to Le Châtelier's principle, how will an increase in concentration of a reactant affect the equilibrium system?

Which state of matter would demonstrate the best ability to flow/pour? explain using the term particles

What physical method can separate a mixture of steel ball bearings and marbles

4. A calorimeter contains 500 g of water at 25°C. You place a hand warmer containing 200 g of liquid sodium acetate inside the calorimeter. When the sodium acetate finishes crystallizing, the temperature of the water inside the calorimeter is 39.4°C.

Elastic energy is stored when an object is stretched. Is this an example of potential or kinetic energy? A. Neither B. Both d C. Kinetic O D. Potential Reset Selection

Round each figure to three significant figures

How long does it take earth to complete one rotation

What are the relative numbers of h3o + and oh - ions in an acidic and alkaline and a neutral solution?

Chloroform was used as an anesthetic for childbirth and surgery during the nineteenth century. Write the molecular formula of chloroform.