Chemistry Half Period Exam- 3° trimester

Matter can't be created or destroyed, it can only be change from one form to another.

• Reaction rate

• Law of conservation of mass.

• Acid-base reactions.

• Endothermic reaction.

Is the process by which substances transform into others.

• Chemical rate

• Chemical reactants

• Chemical reactions

• Physical reactions.

Ways to recognize a chemical change:

• Change in color

• Production of smell or precipitate

• Change in temperature

• All of the above.

Speed at which the reaction happens. It depends on the frequency with which the collisionsbetween the reactants molecules in a reaction are effective.

• Reaction rate

• Chemical rate

• Activation energy

• Products.

Is the amount of energy that reactants need for their collisions to be affective and to be transformed into products.

• Reaction rate

• Activation energy

• Chemical reactions.

• Chemical ractants.

Substances that speed up chemical reactions due to the reduction of the activation energy.

Two or more reactants combine to form one product.

• Synthesis reaction.

• Decomposition reaction

• Displacement reaction.

• Exothermic reaction

One reactant breaks down into two or more different products.

• Synthesis reactions

• Decomposition reaction

• Endothermic reaction.

• Acid- base reactions.

Two or more reactants combine to form two or more products. It also includes the reactions that are not synthesis nor decomposition.

• Decomposition reactions

• Redox reaction

• Exothermic reaction.

• Displacement reaction

The energy released by the substaces is greater than the energy absorbed. In thhis type of reaction is negative because the products have less energy than the reactants.

• Endothermic reactions

• Exothermic reactions

• Acid-base reactions

• Redox reactions.