Which of the following is an example of a chemical change? a. water evaporating from a puddle on a hot day b. burning a piece of toast c. cracking open an egg and removing the yolk d. steam condensing on the bathroom mirror

Predict the products butane (c4h10) + oxygen —>

Consider the following reactions. (note: (s) = solid, (l) = liquid, and (g) = gas.) mg(s) + ½o2(g) → mgo(s) + 146 kcal/mole h2(g) + ½o2(g) → h2o(g), δh = -57.82 kcal/mole what type of reaction is represented by the previous two examples?

What determines the average kinetic energy of the particles in a gas? a. the number of collisions b. the number of particles c. the size of the particles d. the temperature