How many elements are in (NH4)2CO3?

• 4

• 7
• 2
• 3

How many atoms are in (NH4)2CO3?

• 14

• 4
• 13
• 9

Calculate the Mr of H2O. (H=1, O=16)

• 3
• 17
• 16
• 18

1.50 moles of concentration of 5.00 mol/dm3. What is the volume in dm3?

• 7.5
• 0.3
• 3.33

Find the anomally in the following results: 33, 28, 16, 29, 31.

• 33
• 28
• 16
• 29

Find the mean of the following results: 33, 28, 16, 29, 31.

• 30
• 31
• 27
• 34

Place the metals in order of reactivity (most reactive to least reactive)

• Magnesium, iron, copper, gold, potassium
• Potassium, gold, magnesium, iron, copper
• Magnesium, potassium, iron, copper, gold
• Potassium, magnesium, iron, copper, gold

Metal + Acid ->

• Salt + Hydrogen
• Salt + Water + Carbon dioxide
• Salt + Water

Metal oxide + Acid ->

• Salt + Hydrogen
• Salt + Water + Carbon dioxide
• Salt + Water

Metal hydroxide + Acid ->

• Salt + Hydrogen
• Salt + Water + Carbon dioxide
• Salt + Water