Amount of substance

Question 1

What is the definition of relative atomic mass

Answer 1

The average mass of an atom of an element, taking into account it’s naturally occurring isotopes, relative to 1/12th the relative atomic mass of an atom of carbon-12

Question 2

What is the ideal gas equation including units

Answer 2

PV=nRT
P- Pa
V- m^3
T- K

Question 3

What is the empirical formula

Answer 3

The formula that represents the simplest whole number ratio of the atoms of each element present in a compound

Question 4

What are the steps of a titration

Answer 4

1. Fill a burette with the acid of known concentration
2. Accurately measure an amount of the alkali using a calibrated pipette and a pipette filler
3. Add the alkali to a conical flask with a few drops of a suitable indicator.
4. Run in acid from the burette until the colour just changes, showing that the solution in the conical flask is now neutral
5. Repeat the procedure, adding the acid dropwise as you approach the end point, until two values of the volume of acid used at neutralisation are the same, within experimental error.