CHEMISTRY SABIS Grade 9 Week 13 Term 1

The chemical equation for the reaction between sodium and water is:

• Na + H2O → NaOH + H2
• 2Na + H2O → Na2O + H2
• 2Na + 2H2O → 2NaOH + H2
• Na + 2H2O → NaOH + 2H2

What is produced when sodium reacts with water?

• Sodium oxide and hydrogen gas
• Sodium hydroxide and hydrogen gas
• Sodium chloride and oxygen gas
• Sodium nitrate and nitrogen gas

A sample of 4.6 grams of sodium is reacted with excess water. What is the number of moles of sodium metal reacted? (Given atomic mass of Na = 23 g/mol)

• 0.10 mol

• 0.20 mol

• 0.30 mol

• 0.40 mol

Using the reaction 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g), what is the number of moles of hydrogen gas released from 0.2 moles of sodium?

• 0.050 mol

• 0.10 mol

• 0.20 mol

• 0.40 mol

The chemical equation for the reaction between sodium and chlorine is:

• Na + Cl₂ → NaCl

• 2Na + Cl₂ → 2NaCl

• Na + 2Cl₂ → NaCl₂

• 2Na + 3Cl₂ → 2NaCl₃

In an experiment, 14.2 grams of chlorine reacts completely with sodium. How many moles of chlorine reacted? (Given atomic mass of Cl = 35.5 g/mol)

• 0.200 mol
• 0.300 mol
• 0.400 mol
• 0.500 mol

In a reaction of 14.2 grams of chlorine with a sample of sodium .how many moles of sodium chloride is produced

• 0.200 mol
• 0.300 mol
• 0.400 mol
• 0.500 mol

What is the mass of sodium chloride produced when 14.2 grams of chlorine reacts completely with sodium? (Given atomic masses: Na = 23.0 g/mol, Cl = 35.5 g/mol)

• 23.4 g
• 28.7 g
• 11.7 g

• 58.5 g

What is the balanced chemical equation for the reaction between iron and chlorine to produce iron(III) chloride?

• Fe + Cl2 → FeCl3
• 2Fe + 3Cl2 → 2FeCl3
• 3Fe + 2Cl2 → 3FeCl3
• Fe + 3Cl2 → FeCl3

How many moles of chlorine are needed to produce 6.0 moles of iron(III) chloride?

• 3.0 mol
• 6.0 mol
• 9.0 mol
• 12.0 mol