Chapter 3 - Stoichiometry: Calculations with Chemical Formulas and Equations

Question 1

What is Stoichiometry?

Answer 1

It is the area of study that examines the quantities of substances consumed and produced in chemical reactions.

Question 2

Where are the reactants located in a chemical equation?

Answer 2

on the left

Question 3

Where are the products located in a chemical equation?

Answer 3

on the right

Question 4

What does (g) on a reactant and product indicate?

Answer 4

That it is a gas

Question 5

What does (l) on a reactant and product indicate?

Answer 5

That it is a liquid

Question 6

What does (s) on a reactant and product indicate?

Answer 6

That it is a solid

Question 7

What does (aq) on a reactant and product indicate?

Answer 7

That it is an aqueous solution

Question 8

What are combination reactions?

Answer 8

Where two or more substances react to form one product. For example: 2Mg(s) + O2(g) —->2MgO(s)

Question 9

What are decomposition reactions?

Answer 9

In a decomposition reaction, one substance undergoes a reaction to produce two or more other substances.
Ex: CaCO3(s) —–> CaO(s) + CO2(g)

Question 10

What is a combustion reaction?

Answer 10

They are rapid reactions that produce flame.

Question 11

What do combustion reaction mostly consist of?

Answer 11

Most combustion reactions involve O2 from the air as a reactant.
They will usually form CO2 and H2O.
Hydrocarbons (compounds that contain only carbon and hydrogen, such as CH4) react with O2 to form CO2 and H2O