Write answers to the following questions and explain your answers.
Explain the monovalency of the element sodium.

Write answers to the following questions and explain your answers. Explain with examples what is meant by a 'mole' of a substance.

Write answers to the following questions and explain your answers. What is meant by Unified Atomic Mass?

Write answers to the following questions and explain your answers. M is a bivalent metal. Write down the steps to find the chemical formulae of its compounds formed with the radicals : sulphate and phosphate

Write answer the following question in your own words: Explain the effects of volcano?

Answer the following questions Explain how a spectrum is formed.

Answer the following questions: Explain the term balanced forces.

Answer the following questions : Explain the term alkane with example.

Answer the following questions : Explain Dalton's atomic theory.

Write answers to the given question in your own words: Explain the various properties of water.

Answer the following questions: Force is a vector quantity. Explain.