Advertisements
Advertisements
Question
When hydrogen is passed over copper oxide, copper and steam are formed. Write a balanced equation for this reaction and state which of the chemicals are:
- elements
- compounds
- reactants
- products
- metal
- non-metal
Advertisements
Solution
The balanced equation for the reaction of hydrogen gas and copper oxide is written as:
\[\ce{H2_{(g)} + CuO_{(s)} -> Cu_{(s)} + H2O_{(g)}}\]
The chemicals are:
- Elements: Hydrogen (H2) and Copper (Cu)
- Compounds: Copper oxide (CuO) and Water (H2O)
- Reactants: Hydrogen (H2) and Copper oxide (CuO)
- Products: Copper (Cu) and Water (H2O)
- Metal: Copper (Cu)
- Non-metal: Hydrogen (H2)
APPEARS IN
RELATED QUESTIONS
On what basis is a chemical equation balanced?
When hydrogen is passed over copper oxide, copper and steam are formed. Write a balanced equation for this reaction and state which of the chemicals are reactants.
Aluminium burns in chlorine to form aluminium chloride (AlCl3). Write a balanced chemical equation for this reaction.
With the help of an appropriate example, justify that some of the chemical reactions are determined by Change in temperature.
Give chemical equation for the reaction involved in the above case.
Is Burning of natural gas an endothermic reaction or an exothermic reaction?
Is Decomposition of calcium carbonate an endothermic reaction or an exothermic reaction?
Which of the following is not an endothermic reaction?
(a) CaCO3 → CaO + CO2
(b) 2H2O →2H2 + O2
(c) 6CO2 + 6H2O → C6H12O6 + 6O2
(d) C6H12O6 + 6O2 → 6CO2 + 6H2O
When water is added gradually to a white solid X, a hissing sound is heard and a lot of heat is produced forming a product Y. A suspension of Y in water is applied to the walls of a house during white washing. A clear solution of Y is also used for testing carbon dioxide gas in the laboratory.
(a) What could be solid X? Write its chemical formula.
(b) What could be product Y? Write its chemical formula.
(c) What is the common name of the solution of Y which is used for testing carbon dioxide gas?
(d) Write chemical equation of the reaction which takes place on adding water to slid X.
(e) Which characteristic of chemical reactions is illustrated by this example?
When metal X is treated with a dilute acid Y, then a gas Z is evolved which burns readily by making a little explosion.
(a) Name any two metals which can behave like metal X.
(b) Name any two acids which can behave like acid Y.
(c) Name the gas Z.
(d) Is the gas Z lighter than or heavier than air?
(e) Is the reaction between metal X and dilute acid Y, exothermic or endothermic?
(f) By taking a specific example of metal X and dilute acid Y, write a balanced chemical equation for the reaction which takes place. Also indicate physical states of all the reactants and products.
Balance the following chemical equation:
The step(s) necessary for determining the percentage of water absorbed by raisins is/are:
Balance the following equation:
C + H2SO4 → CO2 + H2O + SO2
Balance the following equation:
H2O + Cl2 → HCl + O2
Write the balanced chemical equation of the following reaction.
potassium dichromate + sulphuric acid → potassium sulphate + chromium sulphate + water + oxygen.
Give one example in the case where supplying energy [given below] is necessary for a chemical reaction.
Electrical energy
Give word equation for the following chemical reaction and give the names of the product formed.
Zn + 2HC1→ ZnCl2 + H2
Write word equation for the following chemical reaction given below. Also state the observation seen in the case.
Pb(NO3)2 + 2NH4OH → 2NH4N03 + Pb(OH)2↓
Balance the following simple equation:
CO2 + C → CO
Balance the following chemical equation.
- Na + O2 → Na2O3
- Ca + N2 → Ca3N2
- N2 + H2 →NH3
- CaCO3 +HCl → CaCl2 + CO2 +H2O
- Pb(NO3)2 → PbO + NO2 + O2
