Write the chemical name for the following formula of compounds
Answers
ANSWER
A chemical formula is an expression that shows the elements in a compound and the relative proportions of those elements. Water is composed of hydrogen and oxygen in a 2:1 ratio. The chemical formula for water is H2O.
Explanation:
Allied solutions
Grade 8
Chemistry
Chapters in Simplified Middle School Chemistry - Class 8
Exercises in Language of Chemistry
Question 8
Q8) Write the chemical formula of the following compounds in a step by step manner -
(a) Potassium Chloride
(b) Sodium Bromide
(c) Potassium Nitrate
(d) Calcium Hydroxide
(e) Calcium Bicarbonate
(f) Sodium Bisulphate
(g) Potassium sulphate
(h) Zinc Hydroxide
(i) Potassium permanganate
(j) Potassium dichromate
(k) Aluminium Hydroxide
(l) Magnesium nitride
(m) Sodium zincate
(n) Copper [[II]] oxide
(o) Copper [[I]] sulphide
(p) Iron [[III]] chloride
(q) Iron [[II]] hydroxide
(r) Iron [[III]] sulphide
(s) Iron [[III]] oxide
Solution:
(a) Potassium Chloride:
Symbol Valency
Potassium K 1+
Chlorine Cl 1-
Positive ions are written first
On interchanging the valencies
Formula = KCl_{ }KCl
(b) Sodium Bromide
Symbol Valency
Sodium Na 1+
Bromide Br 1-
Positive ions are written first
On interchanging the valencies
Formula = NaBrNaBr
(c) Potassium Nitrate
Symbol Valency
Potassium K 1+
Nitrate [[> widget id="7" <]] 1-
Positive ions are written first
On interchanging the valencies
Formula = K\left[NO_3\right]K[NO
3
]
(d) Calcium hydroxide
Symbol Valency
Calcium Ca 2+
Hydroxide OH 1-
Positive ions are written first
On interchanging the valencies
Formula = Ca\left[OH\right]_2Ca[OH]
2
(e) Calcium bicarbonate
Symbol Valency
Calcium Ca 2+
Bicarbonate [[> widget id="10" <]] 1-
Positive ions are written first
On interchanging the valencies
Formula = NO_3NO
3
(f) Sodium Bisulphate
Symbol Valency
Sodium Na 1+
Bisulphate [[> widget id="13" <]] 1-
Positive ions are written first
On interchanging the valencies
Formula = Na\left[HSO_4\right]Na[HSO
4
]
(g) Potassium Sulphate
Symbol Valency
Potassium K 1+
Sulphate [[> widget id="16" <]] 2-
Positive ions are written first
On interchanging the valencies
Formula = K_2\left[SO_4\right]K
2
[SO
4
]
(h) Zinc Hydroxide
Symbol Valency
Zinc Zn 2+
Hydroxide OH 1-
Positive ions are written first
On interchanging the valencies
Formula = Zn\left[OH\right]_2Zn[OH]
2
(i) Potassium permanganate
Symbol Valency
Potassium K 1+
Permanganate [[> widget id="21" <]] 1-
Formula = K\left[MnO_4\right]K[MnO
4
]
(j) Potassium dichromate
Symbol Valency
Potassium K 1+
Dichromate [[> widget id="24" <]] 2-
Positive ions are written first
On interchanging the valencies
Formula= K_2\left[Cr_2O_7\right]K
2
[Cr
2
O
7
]
(k) Aluminium hydroxide
Symbol Valency
Aluminium Al 3+
Hydroxide [OH] 1-
Positive ions are written first
On interchanging the valencies
Formula = Al\left[OH\right]_3Al[OH]
3
(l) Magnesium nitride
Symbol Valency
Magnesium Mg 2+
Nitride N 3-
Positive ions are written first
On interchanging the valencies
Formula = Mg_3N_2Mg
3
N
2
(m) Sodium zincate
Symbol Valency
Sodium Na 1+
Zincate [[> widget id="31" <]] 2-
Positive ions are written first
On interchanging the valencies
Formula = Na_2\left[ZnO_2\right]Na
2
[ZnO
2
]
(n) Copper [II] oxide
Symbol Valency
Copper Cu 2+
Oxide O 2-
Positive ions are written first
On interchanging the valencies
Formula = CuOCuO
(o) Copper [I] sulphide
Symbol Valency
Copper Cu 1+
Sulphide S 2-
Positive ions are written first
On interchanging the valencies
Formula = Cu_2SCu
2
S
(p) Iron [III] chloride
Symbol Valency
Iron Fe 3+
Chloride Cl 1-
Positive ions are written first
On interchanging the valencies
Formula = FeCl_3FeCl
3
(q) Iron [II] hydroxide
Symbol Valency
Iron Fe 2+
Hydroxide OH 1-
Positive ions are written first
On interchanging the valencies
Formula =Fe\left[OH\right]_2Fe[OH]
2
(r) Iron [III] sulphide
Symbol Valency
Iron Fe 3+
Sulphide S 2-
Positive ions are written first
On interchanging the valencies
Formula = Fe_2S_3Fe
2
S
3
(s) Iron [III] oxide
Symbol Valency
Iron Fe 3+
Oxide O 2-
Positive ions are written first
On interchanging the valencies
Formula = Fe_2O_3Fe
2
O
3