REDOX PPT Flashcards
(27 cards)
These reactions constitute a class of chemical reactions that involves electron transfer.
Oxidation and reduction
It is the loss of electrons from an atom.
Oxidation
It is the gain of electrons by an atom.
Reduction
Examples of Redox reaction (4)
iron rusts
methane and wood burn
a battery generates electricity
one element gains electrons and another loses them.
Zn —-> Zn^2+
Oxidation or Reduction?
Oxidation
Cu^2+ —-> Cu
Oxidation or Reduction
Reduction
A compound that oxidizes another compound is called an ____.
oxidizing agent
An oxidizing agent gains electrons, so it is ____.
reduced
A compound that reduces another compound is called a ____.
reducing agent
A reducing agent loses electrons, so it is ____.
oxidized
A mole defines a
quantity
A mole is a quantity that contains _____ items—usually atoms, molecules, or ions.
6.02 × 10^23
The 6.02 × 10^23 is called _____, after the Italian scientist ____, who first proposed the concept of a mole in the _____ century.
Avogadro’s number
Amadeo Avogadro
nineteenth
The _____ is the average mass of an element, reported in atomic mass units (amu), and that the atomic weight of each element appears just ____ its chemical symbol in the periodic table.
atomic weight
below
The _____ is the sum of the atomic weights of all the atoms in a compound, reported in atomic mass units (amu)
formula weight
When reactions are carried out in the laboratory, ____ or ____ are much too small to measure out.
single atoms and molecules
Instead, substances are weighed on a balance and amounts are typically reported in ____, not atomic mass units.
grams
To determine how many atoms or molecules are contained in a given mass, we use its ____.
molar mass
The ____ is the mass of one mole of any substance, reported in grams per mole.
molar mass
The value of the molar mass of an element in the periodic table (in grams per mole) is ____ as the value of its atomic weight (in amu).
The same or not the same?
The same
The molar mass is a very useful quantity because it relates the ____ to the ____. In this way, the molar mass can be used as a conversion factor.
number of moles to the number of grams of a substance
Because the molar mass of a substance gives the ____ and a ____, we can use molar mass to show the relationship between grams and number of molecules (or atoms).
number of grams in a mole and a mole contains 6.02 × 1023 molecules (or atoms)
A _____ also tells us the number of moles of each reactant that combine and the number of moles of each product formed.
balanced chemical equation
_____ are used to form mole ratios, which can serve as conversion factors. These ratios tell us the relative number of moles of reactants that combine in a reaction, as well as the relative number of moles of product formed from a given reactant.
Coefficients
