Stoichiometry

Question 1

What information do chemical formulas provide us with?

Answer 1

Chemical formulas provide the identities of the reactants and products involved in the chemical change, allowing classification of the reaction.

Question 2

What information do coefficients provide us with?

Answer 2

Coefficients provide the relative numbers of these chemical species, allowing a quantitative assessment of the relationships between the amounts of substances consumed and produced by the reaction.

Question 3

What is a reaction’s stiochiometry?

Answer 3

Measure of an element used in balanced chemical equations

Question 4

How are balanced chemical equations used in stoichiometry?

Answer 4

Balanced chemical equations are used in much the same fashion to determine the amount of one reactant required to react with a given amount of another reactant, or to yield a given amount of product, and so forth.

Question 5

True or False: The coefficients in the balanced equation are used to derive stoichiometric factors that permit computation of the desired quantity.

Answer 5

True

Question 6

What is a stoichiometric factor?

Answer 6

The ratio of coefficients in a balanced chemical equation, used in computations relating amounts of reactants and products

Question 7

What is stoichiometry?

Answer 7

The relationships between the amounts of reactants and products of a chemical reaction

Question 8

What can we learn from understanding the stoichiometry of a particular reaction?

Answer 8

We can determine how many molecules, moles, and grams will react with each other and how many molecules, moles, and grams of products will be formed

Question 9

What is combustion?

Answer 9

A reaction in which an element or compound burns in air or oxygen

Question 10

True or False: Is oxygen always one of the reactants of combustion?

Answer 10

True

Question 11

True or False: Combustion reactions are another classification of chemical reactions

Answer 11

True

Question 12

What does the combustion of hydrogen gas form?

Answer 12

Water

2H2 + O2 –> 2H2O

Question 13

The combustion of compounds containing hydrogen and carbon will always produce which two products?

Answer 13

Water and carbon dioxide

Question 14

In order to determine the masses of reactants consumed in a reaction, as well as the masses of products formed, we need to use what two important things?

Answer 14

Molar masses and reaction coefficients

Question 15

To find the mass of one chemical from the given mass of another for a chemical reaction, we utilize what process?

Answer 15

Dimensional analysis

Question 16

What is molar mass?

Answer 16

Units of g/mol gives us the ability to determine the moles of a substance from a a given mass and vice versa

Question 17

What are reaction coefficients?

Answer 17

Units of mol/mol allows us to determine how many moles of one substance are consumed or produced relative to another

Question 18

What are the steps necessary to completing a successful stoichiometry equation?

Answer 18

1. Start with a balanced chemical equation
2. Determine starting point from given value and ending point from what the question is asking you to look for
3. Use dimensional analysis to go from necessary units of measurement