Ch. 3 Slides 1-31

Question 1

Stoichiometry

Answer 1

Area of study that examines the quantities of substances consumed and produced in chemical reactions.

Question 2

What is the study of Stoichiometry based on?

Answer 2

The Law of Conservation of Mass (Antoine Lavoisier, 1789)

Question 3

Chemical Equations

Answer 3

What chemists use to represent chemical reactions on paper.

Question 4

Reactants

Answer 4

The starting materials in Chemical equations.
H + HO -> H2 +HO

Question 5

What is often written in parentheses to the right of each formula or symbol?

Answer 5

States of Matter

(g) Gas : (l) Liquid : (s) Solid
(aq) dissolve in aqueous (water) solution

Question 6

Δ

Answer 6

Symbol sometimes used instead of an arrow in a balancing equation.

Question 7

• Combination
• Decomposition
• Combustion

Answer 7

Types of Reactions

Question 8

Combination Reaction

Answer 8

What reaction has two or more substances react to form one product?

Question 9

Decomposition Reaction

Answer 9

The reaction in which one substance breaks down into two or more substances.

Question 10

Combustion Reaction

Answer 10

This reaction is rapid, often involves oxygen, and produces a flame.

Question 11

Formula Weight

Answer 11

The sum of the atomic weights for the atoms in a chemical formula.

Question 12

Molecular Mass

Answer 12

The sum of the atomic weights of the atoms in a molecule

Question 13

Mole (Mol)

Answer 13

The amount of a substance that contains as many elementary entities as there are atoms in exactly 12.00g of 12C

Question 14

Avogadro’s number

Answer 14

The number of atoms/particles equal to 1 mole of an element

Question 15

1 mol/ Avogadro’s number Number

Answer 15

(6.022 x 10^23)

Question 16

Molar Mass

Answer 16

The mass of 1 mole of a substance (in grams)

Question 17

Molar Mass of an Element

Answer 17

The Atomic Weight for the element from the periodic table.