Rates of reactions 2nd year

What is a chemical reaction?

• when two or more substances are added together and there is an explosion

• When two or more substances are added together and results in the formation of a new product.

• When a product is produced from an explosion

• When two or more substances are added together and it results in the formation of a liquid.

In the reaction below, Na is a ______________

Na + Cl -> NaCl

• Reactant

• Reaction

• Product

• Atom

In the reaction below, the Hydrogen gas is a __________

K + H2O -> H2 + KOH

• Reactant

• Reaction

• Product

• Atom

What is the balance chemical equation for the reaction below: 
Mg  +  O2  ->  MgO

• 2Mg + 2O2 -> 3MgO

• Mg + O2 -> MgO

• 3Mg + O2 -> 2MgO

• 2Mg + O2 -> 2MgO

The law of conservation of mass states:

• Total mass of the reactants = total mass of the products

• Total weight of the reactants = totals weight of the products

• Total amount of the reactants = total amount of the products

• Total cost of the reactants = total cost of the products

There is not a change in mass when a physical change takes place.

• True

• False

There is a change of mass when a chemical reaction takes place.

• True

• False

The rate of reaction is defined as:

• Change in mass per unit time of any one reactant/product

• Change in concentration per unit time of any one reactant/product

• Change in temperature per unit time of any one reactant/product

• Change in colour per unit time of any one reactant/product

Which is NOT a factor that affects the rate of reaction.

• Concentration

• Temperature

• Particle size

• Weight

A catalyst is ___________

• a substance that controls the reaction

• a substance that slows down the rate of reaction

• a substance that speeds up the rate of the reaction.

• another name for a conical flask.