Some examples from this set of practice questions
1.
Describe the reaction of sodium with cold water. Include balanced chemical equation.
Answer: Sodium has a very exothermic reaction with cold water producing hydrogen and a colourless solution of sodium hydroxide. 2Na + 2H2O ----> 2NaOH + H2
2.
Describe the reaction of magnesium with cold water and steam. Include balanced chemical equation.
Answer: Magnesium has a very slight reaction with cold water but burns in steam. Mg + 2H2O ---> Mg(OH)2 + H2 Magnesium burns in steam with its typical white flame to produce white magnesium oxide and hydrogen. Mg + H2O ----> MgO + H2
3.
Describe the reaction of Aluminium with cold water. Include balanced chemical equation.
Answer: Aluminium powder heated in steam produces hydrogen and aluminium oxide. The reaction is relatively slow because of the existing strong aluminium oxide layer on the metal, and the build-up of even more oxide during the reaction. 2Al + 3H2O ----> Al2O3 + 3H2
4.
Describe the reaction of silicon with water. Include balanced chemical equation.
Answer: silicon will react with steam at red heat to produce silicon dioxide and hydrogen. Si + 2H2O ----> SiO2 + 2H2
5.
Describe the reaction of PHOSPHORUS, CHLORINE, SULFUR and ARGON with cold water.
Answer: NO REACTION
6.
Describe the reaction of Sodium with Oxygen. Include balanced chemical equation.
Answer: Sodium burns in oxygen with an orange flame to produce a white solid mixture of sodium oxide and sodium peroxide. 4Na + O2 ----> 2Na2O
7.
Describe the reaction of Magnesium with Oxygen. Include balanced chemical equation
Answer: Magnesium burns in oxygen with an intense white flame to give white solid magnesium oxide. 2Mg + O2 -----> 2MgO
8.
Describe the reaction of Aluminium with Oxygen. Include balanced chemical equation
Answer: Aluminium will burn in oxygen if it is powdered, otherwise the strong oxide layer on the aluminium tends to inhibit the reaction. If you sprinkle aluminium powder into a Bunsen flame, you get white sparkles. White aluminium oxide is formed. 3Al + O2 ----> Al2O3
9.
Describe the reaction of Silicon with Oxygen. Include balanced chemical equation
Answer: Silicon will burn in oxygen if heated strongly enough. Silicon dioxide is produced. Si + O2 ----> SiO2
10.
Describe the reaction of Phosphorus with Oxygen. Include balanced chemical equation
Answer: White phosphorus catches fire spontaneously in air, burning with a white flame and producing clouds of white smoke - a mixture of phosphorus(III) oxide and phosphorus(V) oxide. The proportions of these depend on the amount of oxygen available. In an excess of oxygen, the product will be almost entirely phosphorus(V) oxide. For the phosphorus(III) oxide: P4 + 3O2 -----> P4O6 For the phosphorus(V) oxide: P4 + 5 O2 ------> P4O10
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