Paper 1- Unit 4 Maths in Chemistry Flashcards
How do you calculate the relative formula mass for the molecule?
Add up the atomic mass of the different elements
What is the moles equation?
mass = Mr x moles
What is the concentration equation?
moles = concentration x volume
How do you convert cm3 into dm3?
Divide by a 1000
How do you convery Kg into g?
divide by 1000
What is the conservation of mass law?
No atoms can be created nor destroyed
the atoms are just rearranged
What is a compound?
A substance that contains two or more
different types of atoms
that are chemical bonded
What is a molecule?
A substance that contains more than one atom
that is chemically bonded
What is a element?
A substance that contains only one type of atom
what infromation does the mass number tell you about an atom?
it tells you the number of protons + the number of neutrons
What is an isotope?
Two elements
that have a different number of neutrons
What is a mole?
It is avogadros constant number of atoms
What is avogadros constant?
6.02 x 10 to the power of 23
Explain why reactions seem to lose mass
a gas is being formed
which takes the mass with it
Explain why reaction seem to gain mass
a gas is reacting
which adds mass to the substance
