C2 - Amount of substance

Question 1

What is the ideal gas equation?

Answer 1

pV=nRT
p=pressure in Pa
V=volume in m3
n=number of moles
R=gas constant: 8.31
T=temperature in Kelvin (C to K = +273)

Question 2

What is standard temperature and pressure?

Answer 2

298K and 100KPa

Question 3

At standard temperature and pressure how much volume does 1 mole of a gas occupy?

Answer 3

24dm3

Question 4

What is avogardos constant?

Answer 4

1 mole of any substance will contain the same number of atoms (6.022x10 to the 23)

Question 5

How do you find the number of particles?

Answer 5

moles x avogadro’s number

Question 6

How do you find the mass of a particle

Answer 6

molar mass / avogadro’s number

Question 7

How do you find the number of moles?

Answer 7

Mass / Relative atomic or molecular mass

Question 8

What is the molecular formula?

Answer 8

Element and number in a compound. E,g C4H10

Question 9

What is the empirical formula?

Answer 9

The most simple ratio of elements in a compound E.g C4H10 to C2H5

Question 10

What is the formula for a hydroxide ion?

Answer 10

OH -

Question 11

What is the formula for a sulphate ion?

Answer 11

SO4 2-

Question 12

What is the formula for a carbonate ion?

Answer 12

CO3 2-

Question 13

What is the formula for a nitrate ion?

Answer 13

NO3 -

Question 14

What is the formula for an ammonium ion?

Answer 14

NH4 +

Question 15

What is an ionic equation?

Answer 15

Equation in which the formulas of dissolved aqueous solutions are written as individual ions. (spectator ions are not involved)