Writing formulae and equations

Question 1

What is the ion formulae for...
1- Nitrate
2-Carbonate
3-Sulfate
4-Hydroxide
5-Ammonium
6-Zinc
7-Silver

Answer 1

1-  NO3 - 
2- CO3 2 -
3- SO 4 2-
4- OH-
5- NH 4 +
6-ZN2+
7-Ag+

Question 2

Predicting charges on ions based of their position on the periodic table.
Metals in 
1- Group 1
2- Group 2
3- Group 3

Non-metals in
1- Group 5
2- Group 6
3-Group 7

Answer 2

Metals in
1- Group 1 form 1+ ions
2-Group 2 form 2+ ions
2-Group 3 form 3+ ions

Non-metals in
1-Group 5 form 3- ions
2-Group 6 form 2- ions
3-Group 7 form 1- ions

Question 3

When are brackets used in a formulae?

Answer 3

They are used when there are more than one ion that consists of two or more types of atom.

Question 4

What does the large number at the beginning of a formula tell you?

Answer 4

It tells you how many molecules take part or form in the reaction.

Question 5

What is Bohr’s model?

Answer 5

Bohr model describes a shape in space where electrons can be found in atoms.

Question 6

Atomic orbitals

What are the first four types of orbital levels?

Answer 6

s, p, d and f orbitals

Question 7

characteristic of a s orbital

Answer 7

• it is spherical

- holds up to 2 electrons

Question 8

Characteristics of a p orbital

Answer 8

• Dumb-bell shaped

- holds up to 2 electrons

Question 9

Each p subshell has 3 p orbitals

Answer 9

P x3 , P y , P 2.

Question 10

Aufbau principle- energy levels

Answer 10

1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d10,

Question 11

What is higher in energy when occupied? The 4s orbital or the 3d orbital

Answer 11

The 4s orbital is lower in energy than the 3d when empty, but higher in energy when occupied.