Atomic structure/amount of substance

Question 1

what is the 1st ionisation energy?

Answer 1

The standard enthalpy change when 1 mole of gaseous atoms is converted into 1 mole of gaseous ions each with 1 positive charge.

Question 2

What is the definition of relative isotopic mass?

Answer 2

The mass of an atom of an isotope of an element relative to 1/12 the mass of a carbon 12 atom.

Question 3

describe electrospray ionisation

Answer 3

put a substance in a volatile polar solvent which causes the substance to be attacked by hydrogen radicals which cause the substance to gain a proton by electrophilic substitution which is then forced through a thin needle

Question 4

What is the definition of a mole?

Answer 4

The si unit of a substance equal to the quantity containing as many elementary units as there are atoms in 0.012kg of carbon 12.

Question 5

What is the definition of Ar?

Answer 5

The average mass of an atom of an element relative to 1/12th the mass of a carbon 12 atom.

Question 6

What is the definition of Mr?

Answer 6

The average mass of a molecule with respect to 1/12 the mass of a carbon 12 atom.

Question 7

Write an equation for the electrospray ionisation of Titanium

Answer 7

Ti(g) + H+ —-> TiH+(g)

Question 8

empirical formula

Answer 8

is the simplest/smallest whole number ratio of elements in a compound

Question 9

molecular formula

Answer 9

The total number of atoms of each elements in each molecule of a substance