Which of the following represents a physical change?

A: Phase changing, B: Atoms rearranging, C: Bonds breaking, D: Bonds forming

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.