Moles calculations Flashcards
Where are the protons and neutrons in a atom
In the nucleus
Where are the electrons in a atom
On the shells orbiting the nucleus
What is the relative mass of a proton
1
What is the relative mass of a neutron
1
What is the relative mass of a electron
1/1836
What is the relative charge of a proton
+1
What is the relative charge of a neutron
0
What is the relative charge of a electron
-1
What is the atomic number
The number of protons and the number of electrons in a atom
How do you know which is the atomic number
The smaller number
What is the mass number
The total number of protons and neutrons in the nucleus of a atom
Define isotopes
Different atoms of the same element, with the same number of protons but a different number of neutrons
What is the relative atomic mass
The weighted average mass of the isotopes of the element, relative to the mass of the 1/12th of a 12C atom
How do you calculate the relative atomic mass (Ar) of isotope abundances
Ar=(mass number x abundance) + (mass number x abundance)/total abundance(usually 100)
How do you calculate the relative formula mass (Mr)
Add up the mass numbers of each element in the compound
E.g NH4Cl 14+(4x1)+35.5 =53.5
What is a mole
The amount of a substance
What is the unit for moles
Mol
What is the unit for the molar mass (mass number of element)
G/mol
What is the equation linking moles, mass and molar mass
Mass=moles x molar mass
What is the percentage yield
The percentage yield of a chemical reaction shows how much product was actually made compared with the amount of product expected
What is the theoretical yield
The maximum mass of product expected from the reaction using reacting masses
What is the actual yield
The mass of the product that is actually obtained from the real chemical reaction
How do you calculate the percentage yield
Percentage yield=actual yield/theoretical yield x 100
What is the empirical formula
Shows the simplest whole number ratio of atoms present in a compound
