Topic 7: Moles and Stoichiometry

Question 1

Types of chemical formulas

Answer 1

Empirical: elements at simplest whole number ratios

Molecular: showing actual number of atoms per element in a single molecule

Structural: show number of each type of atom and their physical arrangement

Condensed: condensed version of structural

Question 2

chemical formulas show a conservation of…

Answer 2

1. mass
2. charge
3. energy

Question 3

the coefficients in a balanced equation are used to determine…

Answer 3

mole ratios

Question 4

mass of a substance will always equal___

Answer 4

the atomic masses of its atoms

Question 5

molar mass

Answer 5

the mass of ONE mole of the substance

Question 6

how do you calculate percent composition by mass

Answer 6

look at ref tables

Question 7

Synthesis

Answer 7

two or more substances reacting to form a single more complex substance

Question 8

Decomposition

Answer 8

one reactant breaking down into two or more products

Question 9

single/double replacement

Answer 9

single: replaces one element for another in a compound

double: exchanges the cations and anions of two ionic compounds