Iron salt and water are produced.
4. What is a balanced chemical equation? Why should chemical equatio
balanced?
5. Translate the following statements into chemical equations and then balance
(a) Hydrogen gas combines with nitrogen to form ammonia.
(b) Hydrogen sulphide gas burns in air to give water and sulpur dioxide.
(c) Barium chloride reacts with aluminium sulphate to give aluminium chi
and a precipitate of barium sulphate.
(d) Potassium metal reacts with water to give potassium hydroxide and hyd
gas.
6. Balance the following chemical equations.
(a) HNO, + Ca(OH)2 Ca(NO3), +H2O
(b) NaOH + H2SO4 Na SO + H2O
(c) NaCl + AgNO, → AgCl + NaNO,
(d) BaCl, +H,SO, BaSO, + HCI
7. Write the balanced chemical equations for the following reactions
Answers
Answer:
4.A balanced chemical reaction is an equation that have equal numbers of each type of atom on both sides of the arrow.
A chemical equation is a written symbolic representation of a chemical reaction. The reactant chemical(s) are given on the left-hand side and the product chemical(s) on the right-hand side. The law of conservation of mass states that no atoms can be created or destroyed in a chemical reaction, so the number of atoms that are present in the reactants has to balance the number of atoms that are present in the products.
5.(a) Hydrogen gas combines with nitrogen to form ammonia.
H
2
(g)+N
2
(g)→NH
3
The balanced equation for this reaction can be written as:
3H
2
(g)+N
2
(g)→2NH
3
(b) Hydrogen sulphide gas burns in air to give water and sulphur dioxide.
H
2
S(g)+O
2
(g)→H
2
O+SO
2
The balanced equation for this reaction can be written as:
2H
2
S(g)+3O
2
(g)→2H
2
O+2SO
2
(c) Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.
BaCl
2
+Al
2
(SO
4
)
3
→AlCl
3
+BaSO
4
↓
The balanced equation for this reaction can be written as:
3BaCl
2
+Al
2
(SO
4
)
3
→2AlCl
3
+3BaSO
4
↓
(d) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.
K+H
2
O→KOH+H
2
The balanced equation for this reaction can be written as:
2K+2H
2
O→2KOH+H
2
6.(a) 2HNO
3
+Ca(OH)
2
→Ca(NO
3
)
2
+2H
2
O
(b) 2NaOH+H
2
SO
4
→Na
2
SO
4
+2H
2
O
(c) NaCl+AgNO
3
→AgCl+NaNO
3
(d) BaCl
2
+H
2
SO
4
→BaSO
4
+2HCl
7.where are the reactions
Explanation: