# Formulae, equations and Amounts of substances Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

Define the mole

A

The amount of substance in grams that has the same number of particles as there are atoms in 12 grams of Carbon-12

2
Q

Define relative atomic mass

A

The average mass of one atom compared to one-twelfth of the mass of an atom of carbon-12

3
Q

Define Molar Mass

A

The mass in grams of one mole of a substance given in the unit of g/mol

4
Q

what is the formula for moles

A

Mass/Mr

5
Q

What is the formula for concentration

A

moles/volume or mass/volume

6
Q

What is the formula for the volume of a gas at room temp and pressure

A

moles x 24

7
Q

what is the formula of a new diluted solution?

A

original conc x original volume/new diluted volume

8
Q

What is the difference between a random error and a systematic error?

A

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.

9
Q

State the difference between a mistake and an error

A

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.

10
Q

What is the formula for percentage error in an apparatus?

A