Science [2 Mark Questions]

1. Metals are good conductors of heat and electricity.
2. Silver and copper are very good conductor of electricity. However bismuth and tungsten are poor conductors.

1. Non – metals are bad conductor of electricity.
2. Graphite (a form of carbon) is exception.

1. Name of the element.
2. One atom of the element.

Example : The symbol O stands for the element of oxygen. One atom of oxygen.

Organic compounds:
Compounds obtained from living sources such as plants and animals.
Example:
Protein, carbohydrates etc.

1. Aluminium is malleable, soft and does not react with food items, so it is used to wrap food items.
2. Metals are good conductor of heat and electricity, so immersion rods are made up of metallic substances.
3. Sodium and potassium are very reactive, they react with air and water, so they are stored in kerosene.
4. Mercury is used in thermometers and barometers because of its high density and uniform expansion at different temperature.

1. Na – Sodium
2. W – Tungsten
3. Ba – Barium
4. Al – Aluminium
5. U – Uranium.

1. The cooking utensils are made up of aluminium and brass because they are good conductors of heat.
2. Aluminium will form a layer of protective oxide that prevents further reaction. Also aluminium is also relatively cheap and that is why it is used widely in making utensils.

1. Water
2. Hydro chloric Acid
3. Nitric Acid

1. Name of the element.
2. One atom of the element for example,
3. The symbol O stands for the element of oxygen.
4. One atom of oxygen.