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Short Answer Questions
what is the ratio of number of moles of reactants to the number of moles of products in the equation.
S (g) + SO2
(g) -> S (s) + H2
In the refining of silver, the recovery of silver from silver nitrate solution involved displacement by copper metal. Write down the reaction involves.
Translate the following statements into chemical equations and then balance them.
a)Hydrogen gas combines with nitrogen to form ammonia
b)Hydrogen sulphide gas burns in air to give water and sulphur dioxide.
c)Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.
d)Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.
Balance the following chemical equactions:-
-> Ca (NO3)2
b)NaOH + H2
c)NaCI + AgNO3
-> AgCI + NaNO3
Why is respiration considered as an exothermic reaction? Explain.
What is rancidity?
Write the balanced chemical equation of the following and identify the type of reaction in each case:
i.Potassium bromide (aq) + Barium iodide (s)
ii.Zinc carbonate (s) -> Zinc oxide (s) + Carbon dioxide (g)
iii.Magnesium (s) + hydrochloric acid (aq)->Magnesium chloride (aq) + Hydrogen (g)
Balance the following chemical reaction:
O + H2
O -> H3
c)HIO3 -> I2
O5 + H2
d)As + CI -> AsCI5
Balance the chemical equations for the following important industrial processes:
a)Molecular nitrogen and hydrogen combine to give ammonia.
b)Molecular hydrogen and carbon monoxide react to form methanol (CH3
c)CaO + C ->CO + CaC2
+ HCl -> C2
Here are some reactions involving water. Balance the equations :
O + Ca3
O -> NaOH + O2
O -> HF + H3
+ CuO -> Cu + N2
Balance the following equations:
a)Cr + O2
-> Co + H2
Represent each of the following word equations with a balanced chemical equation.
a)Disilane gas (Si2
) undergoes combustion to form solid silicon dioxide and water.
b)Solid aluminium hydride is formed by a combination reaction of its two elements.
c)When solid calcium bisulfate is heated, it decomposes to solid calcium oxide, sulfur dioxide gas, and water.
A large piece of zinc metal is placed in a copper (II) sulfate, CuSO4
, solution. The blue solution become colourles as copper metals falls to the bottom of the container. The resulting solution contains zinc sulfate, ZnSO4
. Write balanced formula unit, total ionic, and net ionic equations for the reaction
A solution of AgNO3
is mixed with a solution of K2
S. write the molecular, total ionic and net ionic equations illustrating the reaction.
Write decomposition reactions for the following compounds
Write one equation each for decompositions reactions where energy is supplied in the form of heat, light or electricity.
Long Answer Questions
What do you understand by exothermic and endothermic reactions? Explain with one example each? Write a balanced chemical equation for the process of photosynthesis and the condition of the reaction giving physical state of all the substances?
Why decomposition reactions are called the opposite of combination reactions? Write equations for these reactions. Discuss the importance of decomposition reaction in metal industries with three points?
What do you mean by precipitation reactions? Explain by giving examples.
Illustrate an activity to show a double displacement reaction. Give the chemical equation of the reaction that takes place. Write the physical state of the product obtained?
Balance the following equations
-> KCl + O2
+ NaOH -> Na2
O + O2
+ HCl -> NaCl + NaHCO3
(v)Mg + N2
(vi)Fe + H2
O -> Fe3
+ Al -> Mn + Al2
O -> Si(OH)4
-> NO + H2
(xi)Al + CuCl2
The oxidation of iron to rust is a problem, but the oxidation of aluminum to aluminum oxide is not why?
Write balanced equations by predicting the products of the following reactions. Include the physical state of each element or compound.
a)Phosphorus burn in chlorine to form phosphorus penta chloride.
b)A single- displacement reaction of calcium metal with a nitric acid solution
c)Burning of natural gas.
d)The process of respiration.
e)When a green iron salt is heated strongly, its colour finally changes to black and odour of burning sulphur is given out.
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