Our Environment — Science STD 10 — Question

Identify the type of chemical reaction taking place in the following:
On heating, green coloured ferrous sulphate crystals, reddish brown solid is left and a smell of a gas having an odour of burning sulphate is experienced.

Why do electricians wear rubber hand gloves while working with electricity?

What causes movement of food inside the alimentary canal?

What is the nature of a mirror having a focal length of, + 10cm?

State the relation between work, charge and potential difference for an electric circuit.

Convey the following information in the form of a balanced chemical equation:
“An aqueous solution of ferrous sulphate reacts with an aqueous solution of sodium hydroxide to form a precipitate of ferrous hydroxide and sodium sulphate remains in solution.”

What are the various steps of food chain called?

Write word equations and then balanced equations for the reactions taking place when:
Dilute hydrochloric acid reacts with iron filings.

Which electric heating devices in your home do you think have resistors which control the flow of electricity?

Name two natural ecosystems and two artificial ecosystems.