(b) Both Lead And Copper Have A Valency Of 2. Write The Formula Of:(i) Lead Carbonate (ii) Copper (II) Chloride

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Introduction

In chemistry, understanding the valency of elements is crucial in determining the formulas of compounds they form. Valency, also known as oxidation number, is a measure of the number of electrons an atom loses or gains to form a chemical bond. In this article, we will explore the valency of lead and copper, and use this information to write the formulas of lead carbonate and copper (II) chloride.

Valency of Lead and Copper

Lead (Pb) and copper (Cu) are both transition metals with a valency of 2. This means that they can form two bonds with other atoms, resulting in a +2 charge. Understanding this valency is essential in determining the formulas of compounds they form.

Writing the Formula of Lead Carbonate

Lead carbonate is a compound formed from lead (Pb) and carbonate (CO3). Since lead has a valency of 2, it will form a +2 charge. Carbonate, on the other hand, has a valency of -2. To balance the charges, we need to determine the number of lead and carbonate ions required to form a neutral compound.

The formula for lead carbonate can be written as:

PbCO3

In this formula, one lead ion (Pb2+) is balanced by one carbonate ion (CO32-). The +2 charge on the lead ion is balanced by the -2 charge on the carbonate ion, resulting in a neutral compound.

Writing the Formula of Copper (II) Chloride

Copper (II) chloride is a compound formed from copper (Cu) and chloride (Cl). Since copper has a valency of 2, it will form a +2 charge. Chloride, on the other hand, has a valency of -1. To balance the charges, we need to determine the number of copper and chloride ions required to form a neutral compound.

The formula for copper (II) chloride can be written as:

CuCl2

In this formula, one copper ion (Cu2+) is balanced by two chloride ions (Cl-). The +2 charge on the copper ion is balanced by the -1 charge on each chloride ion, resulting in a neutral compound.

Conclusion

In conclusion, understanding the valency of elements is crucial in determining the formulas of compounds they form. Lead and copper, both with a valency of 2, can form compounds with other elements. By applying the rules of valency, we can write the formulas of lead carbonate and copper (II) chloride.

Key Takeaways

  • Lead and copper have a valency of 2.
  • The formula for lead carbonate is PbCO3.
  • The formula for copper (II) chloride is CuCl2.
  • Understanding valency is essential in determining the formulas of compounds.

Frequently Asked Questions

  • What is valency? Valency is a measure of the number of electrons an atom loses or gains to form a chemical bond.
  • Why is understanding valency important? Understanding valency is essential in determining the formulas of compounds.
  • What is the formula for lead carbonate? The formula for lead carbonate is PbCO3.
  • What is the formula for copper (II) chloride? The formula for copper (II) chloride is CuCl2.

References

  • Chemistry: The Central Science, 14th edition, by Theodore L. Brown, H. Eugene LeMay, Jr., and Bruce E. Bursten.
  • General Chemistry: Principles and Modern Applications, 10th edition, by Linus Pauling.
  • Chemistry: An Atoms First Approach, 2nd edition, by Steven S. Zumdahl.

Introduction

In our previous article, we explored the valency of lead and copper, and used this information to write the formulas of lead carbonate and copper (II) chloride. In this article, we will answer some frequently asked questions related to valency and writing formulas of compounds.

Q&A

Q: What is valency?

A: Valency is a measure of the number of electrons an atom loses or gains to form a chemical bond. It is also known as oxidation number.

Q: Why is understanding valency important?

A: Understanding valency is essential in determining the formulas of compounds. By knowing the valency of elements, we can predict the number of bonds they will form with other elements, and write the correct formula for the compound.

Q: What is the difference between valency and oxidation number?

A: Valency and oxidation number are often used interchangeably, but technically, valency refers to the number of bonds an atom forms with other atoms, while oxidation number refers to the charge an atom has due to the loss or gain of electrons.

Q: How do I determine the valency of an element?

A: To determine the valency of an element, you need to know its position in the periodic table. Elements in the same group (vertical column) have the same valency. For example, all elements in group 1 (alkali metals) have a valency of 1.

Q: What is the formula for lead carbonate?

A: The formula for lead carbonate is PbCO3. This is because lead has a valency of 2, and carbonate has a valency of -2.

Q: What is the formula for copper (II) chloride?

A: The formula for copper (II) chloride is CuCl2. This is because copper has a valency of 2, and chloride has a valency of -1.

Q: How do I write the formula for a compound?

A: To write the formula for a compound, you need to know the valency of the elements involved. Then, you need to balance the charges by determining the number of atoms of each element required to form a neutral compound.

Q: What is a neutral compound?

A: A neutral compound is a compound that has no net charge. This means that the positive charges (from cations) are balanced by the negative charges (from anions).

Q: Can you give an example of a neutral compound?

A: Yes, lead carbonate (PbCO3) is a neutral compound. It has a lead ion (Pb2+) with a +2 charge, balanced by a carbonate ion (CO32-) with a -2 charge.

Conclusion

In conclusion, understanding valency is essential in determining the formulas of compounds. By knowing the valency of elements, we can predict the number of bonds they will form with other elements, and write the correct formula for the compound. We hope this Q&A article has helped you understand valency and writing formulas of compounds.

Key Takeaways

  • Valency is a measure of the number of electrons an atom loses or gains to form a chemical bond.
  • Understanding valency is essential in determining the formulas of compounds.
  • The formula for lead carbonate is PbCO3.
  • The formula for copper (II) chloride is CuCl2.
  • A neutral compound is a compound that has no net charge.

Frequently Asked Questions

  • What is valency?
  • Why is understanding valency important?
  • What is the difference between valency and oxidation number?
  • How do I determine the valency of an element?
  • What is the formula for lead carbonate?
  • What is the formula for copper (II) chloride?
  • How do I write the formula for a compound?
  • What is a neutral compound?
  • Can you give an example of a neutral compound?

References

  • Chemistry: The Central Science, 14th edition, by Theodore L. Brown, H. Eugene LeMay, Jr., and Bruce E. Bursten.
  • General Chemistry: Principles and Modern Applications, 10th edition, by Linus Pauling.
  • Chemistry: An Atoms First Approach, 2nd edition, by Steven S. Zumdahl.