P-1 Chemical reactions and equations — Science STD 10 — Question

Write the electronic configuration of first four elements in this group.

Explain why, the core of an electromagnet should be of soft iron and not of steel.

Which structures in human female are equivalent to the following structures in the male?

1. Testes.
2. Vas deferens.
3. Penis.

In each case say in what respect the structures are equivalent?

Write notes :Proteins

A red-haired woman marries a brown-haired man, and all the children are brown haired. Explain this genetically.

In an electrolytic tank, aluminium metal is being extracted by the electrolysis of molten aluminium oxide using carbon electrodes. It is observed that one of the carbon electrodes is gradually burnt away and has to be replaced.

1. Which carbon electrode (cathode or anode) is burnt away?
2. Why is this carbon electrode burnt away?

Define :Aromatic Compounds

What is meant by biodegradable waste materials? Give two examples of biodegradable wastes.

State two hazards associated with the use of electricity.

Write short notes :
Latent heat