A firework exploding is an example of a

physical change

chemical change

phase change

nuclear change

In an experiment, having too many variables A might solve the problem faster B could solve more than one problem C will cause too many problems D will not matter

Consider the following reaction: COCl2 (g) ⇌ CO (g) + Cl2 (g) A reaction mixture initially contains 1.6 M COCl2. Determine the equilibrium concentration of CO if Kc for the reaction at this temperature is 8.33 * 10-4 (Hint: Note the size of Kc).

Consider this equilibrium: N2 (g) + 2O2 (g) NO2 (g). Equal amounts of N2 and O2 are added, under certain conditions, to a closed container. Which changes occur in the reverse reaction as the system proceeds toward equilibrium? A.

Which form of energy is produced by an exothermic reaction?

4. A gas at 400 K is placed in a 4.0 L moveable piston. The gas is cooled to 252 K. a. What is the new volume in the piston?

Which of the following elements is the most nonreactive? H, fe, Au, O, Ne

Which is most likely why many scientists reject the cold fusion theory? There is too much waste involved in the process. Cold fusion experiments have been conducted at room temperature only.

What is the solubility of m (oh) 2 in a 0.202 m solution of m (no3) 2? ksp 4.45*10^-12?

Describe three physical changes that occur in nature.

Name the two sub-atomic particles in the nucleus of an aluminium atom.