What must happen before a chemical reaction can begin?
a) the activation energy must be exceeded.
b) the activation energy must be reached.
c) the concentrations of products and reactants must be equal.
d) the concentration of reactant molecules must be reduced.

The minerals found in bones are deposited by living cells called

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.

How many moles of potassium hydroxide are needed to completely react with 2.94 moles of aluminum sulfate