Formulae, equations and Amounts of substances
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Define the mole
The amount of substance in grams that has the same number of particles as there are atoms in 12 grams of Carbon-12
Define relative atomic mass
The average mass of one atom compared to one-twelfth of the mass of an atom of carbon-12
Define Molar Mass
The mass in grams of one mole of a substance given in the unit of g/mol
what is the formula for moles
Mass/Mr
What is the formula for concentration
moles/volume or mass/volume
What is the formula for the volume of a gas at room temp and pressure
moles x 24
what is the formula of a new diluted solution?
original conc x original volume/new diluted volume
What is the difference between a random error and a systematic error?
random error: caused by unpredictable changes in conditions or by a difference in recording that is difficult to get right. Systematic error: caused by the apparatus- causes reading to be too high or low.
State the difference between a mistake and an error
error: the difference between an experimental and true or correct value. Mistake: something that even a skilled operator finds difficult to avoid, but can be avoided through taking different measures.
What is the formula for percentage error in an apparatus?
uncertainty/reading x 100
How can we reduce errors?
• use more precise equipment • measure larger volumes of liquid with the same accuracy.