Chapter 5 - Steven
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What is a mole?
A large number of particles
How many particles are there in 1 mole?
6.02 X 10^23
What is avagadro’s constant?
The number of particles in 1 mole
What is the equation for the number of moles?
Particles you have / Particles in 1 mole
What is the mass / molar mass equal to?
The number of moles
What is the molar mass?
The relative molecular mass
What is the unit for the molar mass?
g / mol
What are the 2 units that the concentration can be measured in?
g/dm^3 and moles/dm^3
What is the equation for concentration?
Moles / Volume or mass / volume
What is the volume recorded in?
dm^3
What is 1dm^3?
1000cm^3
What is the empirical formulae?
The simplest ratio of atoms in a compound
What is the molecular formula?
The actual numbers of each atom in a compound
What is the % composition of an element?
Mass of element / Mass of total compound X 100
What do balanced equations have?
Equal numbers of each atom on both sides
What do ionic equations show?
The reacting particles
How do you write an ionic equation?
• Break up the equation into ions - Cross out any ions that are on the same side
What does the reaction stoichiometry show you?
The molar ratios
What does the state symbol ‘s’ stand for?
Solid
What does the state symbol ‘g’ stand for?
Gas
What does the state symbol ‘l’ stand for?
Liquid
What does the state symbol ‘aq’ stand for?
Aqueous
What does aqeous mean?
Solution in water
What happens in a displacement reaction?
A more reactive element reacts to take the place of a less reactive element