Chemistry Reaction Grade 7

What is a chemical reaction?

• A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

• A chemical reaction is a mathematical equation.

• A chemical reaction is a biological process.

• A chemical reaction is a physical change in matter.

What are the reactants in a chemical reaction?

• The catalysts involved

• The products of the reaction

• The temperature of the reaction

• The substances that undergo a chemical change.

What are the products in a chemical reaction?

• The products in a chemical reaction are the substances formed after the reaction has taken place.

• The products in a chemical reaction are the catalysts

• The products in a chemical reaction are the reactants

• The products in a chemical reaction are the intermediates

What is the Law of Conservation of Mass?

• Matter can be converted into energy in a chemical reaction

• Matter can be created in a chemical reaction

• Matter cannot be created or destroyed in a chemical reaction, only rearranged.

• Matter can be destroyed in a chemical reaction

What is a catalyst in a chemical reaction?

• A catalyst is a substance that has no effect on the rate of a chemical reaction.

• A catalyst is a substance that is consumed in the chemical reaction.

• A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process.

• A catalyst is a substance that decreases the rate of a chemical reaction.

What is an exothermic reaction?

• An exothermic reaction has no impact on the energy of the system

• An exothermic reaction releases energy in the form of heat or light.

• An exothermic reaction only releases energy in the form of sound

• An exothermic reaction absorbs energy from the surroundings

What is an endothermic reaction?

• An endothermic reaction involves the release of light energy.

• An endothermic reaction absorbs heat from its surroundings.

• An endothermic reaction releases heat to its surroundings.

• An endothermic reaction is a reaction that occurs at high temperatures.

What is a reversible reaction?

• A reversible reaction is a chemical reaction that only occurs in one direction

• A reversible reaction is a chemical reaction where the products can react to reform the original reactants.

• A reversible reaction is a chemical reaction that produces irreversible products

• A reversible reaction is a chemical reaction where the products cannot react to reform the original reactants

What is a combustion reaction?

• A combustion reaction is a chemical reaction that involves the formation of water only.

• A combustion reaction is a chemical reaction that results in the release of solid particles.

• A combustion reaction is a chemical reaction that involves the absorption of heat energy.

• A combustion reaction is a chemical reaction that involves a fuel and an oxidant resulting in the release of heat and light energy.

What is a precipitation reaction?

• A precipitation reaction occurs when two solids dissolve in a solution

• A precipitation reaction is a type of chemical reaction where two soluble compounds in a solution combine to form an insoluble solid called a precipitate.

• A precipitation reaction is a type of chemical reaction where two gases combine to form a liquid

• A precipitation reaction involves the separation of a solution into its individual components