Advertisements
Advertisements
प्रश्न
Classify the following into elements and compounds :
- H2O
- He
- Cl2
- CO
- Co
Advertisements
उत्तर
| Compounds | Elements |
| H2O, CO | He, Co, Cl2 |
APPEARS IN
संबंधित प्रश्न
When a gas jar containing air is inverted over a gas jar containing bromine vapour, the red-brown bromine vapour diffuse into air. Explain how bromine vapour diffuse into air.
Name the property which enables metals to be drawn into wires.
What are pure substances ? Give two examples of pure substances.
What is the concentration of a solution which contains 16 g of urea in 120 g of solution ?
What happens when the temperature of a saturated sugar solution is increased ?
Fill in the following blank :
Milk is a .................... solution but vinegar is a .................... solution.
Fill in the following blank :
A colloid is a ..............mixture and its components can be separated by the technique known as ...............
Classify the following into solutions, suspensions and colloids :
Soda-water, Milk, Brine, Blood, Ink, Smoke in air, Chalk water mixture, Milk of Magnesia, Shaving cream, Muddy river water.
Which of the following are chemical changes and which physical ? Give reason.
- a glass bottle breaking
- coal burning in air
- making a cake
- wool being knitted into a sweater
Which one of the following is not a chemical change ?
One of the following represents the solution of solid in a solid. This one is :
The technique which is used to separate particles of a solid suspended in a liquid quickly is called :
Tincture of iodine is a mixture of two materials X and Y. The material Y has a property that its solid form can be converted directly into vapours on heating by a process called Z.
- What could X be ?
- What could Y be ?
- Name the process Z.
- Which process would you use to recover both the components X and Y from tincture of iodine ?
- Which process can be used to recover only component Y from tincture of iodine ?
Explain the meaning of the term matter with special reference to the term ‘substance’.
Asmita went to buy an earthen pot. There she saw many things kept for sale.
How did she identify what she needed?
Solids possess very high kinetic energy.
The fluidity of solids: ______.
Define the term matter.
Write a scientific reason.
Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.
