C3.1.1 - Formulae Of Elements And Molecules

Question 1

What does the Periodic Table show you?

Answer 1

The names of elements, the chemical symbols for their atoms, their atomic number and their relative atomic mass

Question 2

Describe how you would write a chemical symbol?

Answer 2

Each chemical symbol has 1, 2, or 3 letters, and starts with a capital letter and is followed with letters in lowercase

Question 3

Why are the formulae for metal elements always written as empirical formulae?

Answer 3

As they are giant metallic lattices, which means the number of atoms would be immense

Question 4

What are diatomic molecules?

Answer 4

The non-metal elements in Group 7(IUPAC Group 17) which are attracted together due to intermolecular forces

Question 5

What does a diatomic molecule contain?

Answer 5

2 atoms covalently bonded together (having a subscipt 2)

Question 6

What diatomic molecules do not have are not in Group 7?

Answer 6

Hydrogen, nitrogen and oxygen

Question 7

What is the empirical formula for sulfur?

Answer 7

S8

Question 8

What is the empirical formula for phosphurus?

Answer 8

P4

Question 9

What does the molecular formula for a simple covalent compound show?

Answer 9

The symbols for each element it contains and the number of atoms of each element in one of its molecules