9C chemistry 2nd midterm review 1

If the sign of enthalpy change is NEGATIVE, the reaction is ___________.

For a reaction of X +Y -------> Z, which curve indicates the reactants and which curve shows the products?

To break bonds, energy is _____________. The process is _____________(exothermic/endothermic).

What type of reaction is shown by the energy profile diagram?

A reaction that absorbs energy from the surroundings is an ___________ reaction.

Why do most reactions start fast and get slower and slower?

When the temperature is increased, the chemical reaction time is ___________.

Why does breaking up solid reactants into smaller pieces increase the rate of reaction?

Which reaction might have been performed: i) at a higher temperature with dilute reactants? ii)used the greatest amount of reactants? iii)used the dilute reactants?

The graph shows a reaction between magnesium and HCl solution in a beaker. Reactants are measured. Which curve is performed at a higher temperature?

The heat energy change in chemical reactions is called ______________ change.

How does a catalyst increase the rate of a reaction?

Name 4 factors that affect the rate of reaction.

The minimum amount of energy required for a reaction to occur is called the __________ __________.

A _____________ is a substance that changes the rate of a chemical reaction and is chemically unchanged at the end of the reaction.

If the sign of enthalpy change is NEGATIVE, the reaction is ___________.

In an exothermic reaction, the energy released on forming new bonds is _____________ than that needed to break the old bonds.

This is an energy profile diagram. Number(2) indicates the _______    _________ and number(3) indicates the _____    ________.