Answer: 1. magnesium hydroxide + sulfuric acid = magnesium sulphate + water
2. calcium hydroxide + hydrochloric acid = calcium chloride + water
3. lead hydroxide + nitric acid = lead nitrate + water
4. sodium hydroxide + sulfuric acid = sodium sulphate + water
5. potassium hydroxide + citric acid = potassium citrate + water
6. silver hydroxide + hydrochloric acid = silver chloride + water
7. aluminium hydroxide + phosphoric acid = aluminium phosphate + water
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
The balanced chemical equations are :
1. magnesium hydroxide + sulfuric acid = magnesium sulphate + water
2. calcium hydroxide + hydrochloric acid = calcium chloride + water
3. lead hydroxide + nitric acid = lead nitrate + water
4. sodium hydroxide + sulfuric acid = sodium sulphate + water
5. potassium hydroxide + citric acid = potassium citrate + water
6. silver hydroxide + hydrochloric acid = silver chloride + water
7. aluminium hydroxide + phosphoric acid = aluminium phosphate + water
Answer:
Empirical formula is C₉H₁₅O
Molecular formula = C₈₁H₁₃₅O
₉
Explanation:
Percentage of carbon = 77.60%
Percentage of oxygen = 11.45%
Percentage of hydrogen = 10.95%
Molecular weight = 1253 g/mol
Molecular formula = ?
Empirical formula = ?
Solution:
Number of gram atoms of C = 77.60 g /12g/mol =6.5
Number of gram atoms of O = 11.45 g / 16 g/mol = 0.72
Number of gram atoms of H = 10.95 g / 1.008 g/mol= 10.9
Atomic ratio:
C : H : O
6.5/0.72 : 10.9/0.72 : 0.72/0.72
9 : 15 : 1
C : H : O = 9 : 15 : 1
Empirical formula is C₉H₁₅O
Molecular formula:
Molecular formula = n (empirical formula)
n = molar mass of compound / empirical formula mass
n = 1253 / 139
n = 9
Molecular formula = n (empirical formula)
Molecular formula = 9 (C₉H₁₅O
)
Molecular formula = C₈₁H₁₃₅O
₉
Answer:
Cardiac muscle is controlled involuntary, whereas skeletal muscle is voluntary.
Explanation:
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