What is metals & non metals?

The elements which have a tendency to form positive ions are known metals. The elements which have a tendency to form negative ions are known non-metals. The elements whose properties fall between those of metals and non-metals ore known metalloids.

Metals

Metals in their pure state, have metallic lustre.

Metals are generally hard.

• Some metals can be beaten into thin sheets. This property is called f malleability. ⚫ Metals are ductile, ie, thin wires can be drawn from metals. • Metals are good conductor of heat and electricity and have high melting points. Silver and copper are the best conductor of heat.

Metals are solid but mercury is liquid at room temperature.

. Their oxides are basic.

With dil. HCl or H,SO,, they release H₂ gas. e.g., aluminium, copper, sodium, etc

Non-metals

. These can be solid, liquid or gas at room temperature. . These are neither malleable nor ductile. These are brittle.

These do not conduct heat and electricity. C (graphite) is good conductor of electricity.

. These are not lustrous

Iodine is non-metal but have lustrous appearance. Non-metals are generally soft.

They have comparatively low melting and boiling points. Their oxides are acidic.

e.g., oxygen, nitrogen, etc.

What are life process?

WHAT ARE LIFE PROCESSES? The maintenance functions of living organisms must go on even when they are not doing anything particular. Even when we are just sitting in class even if we are just asleep, this maintenance job has to go on The processes which together perform this maintenance job an We processes . Since these maintenance processes are needed to prevent damage and break-down energy is needed for them. This energy comes from outside the body of the mdhadual organism. So there must be a process to transfer a source of energy from outside the body of the organism which we call food, to the inside, a process we commonly call nutrition If the body size of the organisins is to grow, additional raw material wit also be needed from outside. Since life on earth depends on carbon- based molecules most of these food sources are also carbon-based Depending on the complexity of these carbon sources, different organisms can then use different kinds of nutritional processes The outside sourc...

Nutrition in human being?

Nutrition in Human Beings The alimentary canal is basically a long tube extending from the mouth to the anus. we can see that the tube has different parts. Various regions are specialised to perform different functions. What happens to the food once it enters our body? We shall discuss this process here. We eat various types of food which has to pass through the same digestive tract, Naturally the food has to be processed to generate particles which are small and of the same texture. This is achieved by crushing the food with our teeth, Since the lining of the canal is soft, the food is also wetted to make its passage smooth. When we eat something we like, our mouth waters. This is actually not only water..but a fluid called saliva secreted by the salivary glands. Another aspect of the food we ingest is its complex nature. If it is to be absorbed from the alimentary canal, it has to be broken into smaller molecules. This is done with the help of biological catalysts called enzyme...

Adaptation in lion & adaptation in deer

A large area of land covered mainly with trees and plants is called alaust And a large area of grass covered land used for grazing is called grassland There are few trees or places for animals to hide gland habitats. Due to this speal is important for the animals which live in grassland habitats (so they can nits away from their enemies) For most common purposes, however, the wrous forest and and are used in the same sense. The forest (or grassland) is a habitat Many animals such as lon som elephants deer, en live in forest habitats. There are many features of a lion, a deck, other animals and plant which help them to survive in the forest habitat. The adaptations in lion and deer to the forest habitat are described below. Adaptation of lion The lion is a camivorous animal which eats only the meat (or flesh) of oder animals. The lion lives in a forest habitat The adapted to the forest habitat in the following ways: 1.The lion is a strong, fast and agile animal which can hunt and ...

Study life

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