Viraf J. Dalal solutions for New Simplified Middle School Chemistry [English] Class 6 chapter 1 - Introduction to Chemistry [Latest edition]

State what is Science and give the basic bifurcation of Science with reasons.

Give the basic difference between Inorganic Chemistry and Organic Chemistry.

State the functions of the following basic glass apparatus:

Glass test tube

State the functions of the following basic glass apparatus:

Hard glass boiling tube

State the functions of the following basic glass apparatus:

Beaker

State the functions of the following basic glass apparatus:

Round bottom flask

State the functions of the following basic glass apparatus:

Retort

State why a round bottom flask is preferred to a flat bottom flask – during the preparation of gases in the laboratory.

State the function of

The wooden handle at the end of the test tube holder.

State the function of

The asbestos fixed at the center of the wire gauze.

State the function of

The clamp mounted on the rod of a retort stand

State the function of

The air regulator in a Bunsen burner.

State the function of The tap at the base of a burette.

State the method used for collecting the following gas:
Oxygen – a gas slightly soluble in water.

State the method used for collecting the following gas-
Ammonia – a gas highly soluble in water and lighter than air

State the method used for collecting the following gas:
Sulphur dioxide – a gas highly soluble in water and heavier than air

Explain in brief the importance of Chemistry in agriculture.

Explain in brief the importance of Chemistry in the production of various products.

‘Alchemists are older words for Chemists’. Discuss the statement in brief.

In the medieval ages – the philosopher’s stone was connected with all transformations. Explain.

State the contributions of Dimitri Mendeleev

State the contributions of Antoine Lavoisier

State the contributions of John Dalton – towards the development of Chemistry.

Differentiate between the terms food preservatives and food processing with appropriate examples.

Explain the term ‘cosmetics’ ‘talc’. Name a few main ingredients in cosmetics the role they play.

Differentiate between natural fibres & synthetic fibres.

Explain how medicines are a boon to mankind. State the positive & negative effects of medicines like aspirin and paracetamol.

Give a comparative difference between soaps and detergents. Give a reason. why detergents have an advantage over soap.

State what are – ‘stain removals’. Name three important stain removers & give their prime functions.

Select the correct name from the choices given below for the following case.

The branch of Science which deals with the different forms of energy e.g. light and sound.

Select the correct name from the choices given below for the following case.

The branch of Chemistry which includes a study of specific carbon compounds – built up mainly carbon and hydrogen.

Select the correct name from the choices given below for the following case.

The scientist who formulated the Periodic Table.

Select the correct name from the choices given below for the following case.

Predecessors to the modern Chemist who created the ‘Philosopher's stone’.

Select the correct name from the choices given below for the following case.

A synthetic fibre used in clothing.

Select the correct name from the choices given below for the following case.

A Medicine to treat pain, fever & inflammation.

Select the correct name from the choices given below for the following case.

A water-soluble cleaning agent – not inactivated by hard water.

Select the correct name from the choices given below for the following case.

A substance which absorbs moisture and keeps the skin dry and free from rashes.

Select the correct name from the choices given below for the following case.

A chemical used as a preservative for jams, pickles, etc.

Select the correct name from the choices given below for the following case.

A substance which dissolves grease & oil and is preferred as a – drain cleaner.

Match the apparatus A to J shown below with their correct names 1 to 10 given below:

1. Delivery Tube
2. Pipette
3. Wire gauze
4. Bee-hive shelf
5. Thistle funnel
6. Flat bottom flask
7. Test tube stand
8. Burette
9. Retort
10. Conical flask

Select the correct apparatus from A, B, or C for the following functions of the apparatus given.

For gas preparations where heating is required.

Select the correct apparatus from A, B, or C for the following functions of the apparatus given.

For holding washed test tubes

Select the correct apparatus from A, B, or C for the following functions of the apparatus given.

A glass apparatus resistant to chemicals, made of pyrex, and used for heating specific liquids.

Select the correct apparatus from A, B, or C for the following functions of the apparatus given.

A metallic apparatus which supports the wire gauze.

Select the correct apparatus from A, B, or C for the following functions of the apparatus given.

A long glass apparatus closed at one end used for collecting gases.

Select the correct apparatus from A, B, or C for the following functions of the apparatus given.

A glass apparatus that measures liquid by sucking the liquid at one end up to the marked level and later pouring it out.

Select the correct apparatus from A, B, or C for the following functions of the apparatus given.

A long glass tube with a broad inlet at the top, which allows entry of the reactants into the round bottom flask, during laboratory preparations of gases.

Select the correct apparatus from A, B, or C for the following functions of the apparatus given.

A modern apparatus with an air regulator, used for heating purposes.

Select the correct apparatus from A, B, or C for the following functions of the apparatus given.

A modern apparatus with an air regulator, used for heating purposes.

Select the correct apparatus from A, B, or C for the following functions of the apparatus given.

A rectangular mesh with asbestos at its centre kept for initiating even distribution of heat to the bottom of the apparatus.

Give reasons for the following

Alchemy was considered a pseudoscience.

Preservatives are added to food or beverages.

Give reasons for the following

Titanium dioxide is an important ingredient in cosmetics.

Give reasons for the following

Aspirin is one of the most widely used medications – globally.

Give reasons for the following

Ordinary soap is wasted in hard water.

A philosopher’s stone is not exactly a stone.

Food processing is an important procedure for obtaining marketable food products.

Give reasons for the following

Cosmetics may contain preservatives, as one of their ingredients.

Give reasons for the following

Polyester is added to natural fiber cotton, to give terylene.

Give reasons for the following

All medicines must be taken under proper doctors' supervision and in the correct dose.