Compounds & Stoichiometry

Question 1

Which law states that any pure sample of a given compound will contain the same elements in an identical mass ratio ?

Answer 1

Law of constant composition

Question 2

What is the difference between empirical & molecular formula ?

Answer 2

Empirical is the simplest whole number ratio of elements in a compound, while molecular formula is the exact # of atoms of each element in a compound (multiple of EF)

Question 3

2 or more reactants forming 1 product is known as ?

Answer 3

Combination rxn

A + B—> C

Question 4

When a reactant breaks-down into 2 or more products, this is known as ?

Answer 4

Decomposition

A—-> B + C

Question 5

The rxn that involves an oxidant & fuel, that typically form CO2 & H2O is known as ?

Answer 5

Combustion rxns

Question 6

When an atom or ion in a compound is replaced by an atom or ion from another compound, this mechanism is known as ?

Answer 6

Single-displacement rxn

Question 7

When elements from 2 different compounds swap places w/ each other to form 2 new compounds, this is known as ?

Answer 7

Double-displacement rxns or metathesis rxns

*Neutralization rxn: acod + base = salt + H2O

Question 8

What are keen principles to keep in mind when determining limiting reagent ?

Answer 8

1. Comparisons of reactants MUST be done in mole to mole units
2. Absolute mole quantities do not determine limiting reagent alone; limiting reagent determined w/ it combined w/ rate of reactants being consumed

Question 9

Solutes that enable solutions to carry currents are called ?

Answer 9

Electrolytes