Paper 2 Stuff I dont Know

Question 1

Percentage yield equation

Answer 1

Actual yield/ theoretical yield x100

Question 2

Atom economy equation

Answer 2

Atom economy= sum of Mr of desired products/ sum of Mr of all products x100

Question 3

What bond angle does tetrahedral shapes have?

Answer 3

109.5

Question 4

What bond angle does pyramidal shape have?

Answer 4

107

Question 5

What bond angle does non- linear shapes have?

Answer 5

104.5

Question 6

What bond angle does the linear shape have?

Answer 6

180

Question 7

What bond angle does the octahedral shape have?

Answer 7

90

Question 8

What bond angle do CO3^2- have?

Answer 8

120

Question 9

What bond angle do NO3^- have?

Answer 9

120

Question 10

What bond angle do SO4^- have?

Answer 10

109.5

Question 11

What is electronegativity?

Answer 11

Attraction of a bonded atom for the pair of electrons in the covalent bond

Question 12

Which intermolecular force do all molecules have?

Answer 12

London forces

Question 13

Which molecules have permanent dipole- dipole interactions?

Answer 13

Polar molecules with permanent dipoles

Question 14

Explain how an induced dipole forms

Answer 14

• fluctuations in electron density creates an instantaneous dipole
• instantaneous dipole induces a dipole in a neighbouring molecule

Question 15

State and explain 2 anomalous properties of water

Answer 15

• ice is less dense than water
• hydrogen bonds hold molecules apart in open lattice structure
• higher melting and boiling point than expected
• large amount of energy is needed to break the hydrogen bonds