young k

Head Start To AS Chemistry

Section One - The Structure of the Atom
Atomic Structure
1) Copy and complete the table:
Particle
Relative Mass
Relative Charge
Proton
1
+1
Neutron
1
0
Electron
1/840
-1

2) What is the charge on an ion formed when an atom loses two electrons? +2
3) What is the charge on an ion formed when an atom gains two electrons? -2

The Mole
1) Find the molar mass of zinc 65g/mol
2)Find the molar mass of sulfuric acid H2 SO4 98g/mol
3) How many moles of sodium chloride are present in 117g of Na2 CI 2 moles
4) I have 54g of water (H2O) and 84 g of iron (Fe) do I have more moles of water or of iron I have more miles of water (54 g = 3 moles H20 , 84g = 1.5 moles Fe)

Arrangement of Electrons
1) Draw diagrams to show the electron arrangements to the following elements: Carbon, Fluorine, magnesium, sulfur

2) Write the electron arrangements of the following elements using the format shown above: lithium, sodium, potassium, beryllium, magnesium, calcium lithium:2,1 sodium:2,8,1 potassium:2,8,8,1 beryllium:2,2 magnesium: 2,8,2 calcium: 2,8,8,2

The periodic table
1) Draw a table showing which of the following elements are from the S block and which are from the P block : caesium, potassium, phosphorus, calcium, aluminum, barium and sulfur
S-block elements p-block elements
Caesium
Phosphorus
Potassium
Aluminum
Calcium
Sulfur
Barium

Ionic Bonding
1) Draw a diagram showing how a magnesium atom reacts with a oxygen atom. In your diagram try to clearly demonstrate the electron transfer process

2) draw a diagram showing the electron transfer process that results in the formation of calcium chloride (CaCI20.

Covalent Bonding
1) Draw `dot and cross' diagrams showing the shared electron pairs in the following molecules: