Advertisements
Advertisements
प्रश्न
Give one difference between atoms and molecules.
उत्तर
Atoms may or may not have independent existance. Molecules have independent existance.
APPEARS IN
संबंधित प्रश्न
Name the scientist who studied the movement of pollen grains suspended in water through a microscope. What is this phenomenon known as?
During respiration, glucose and oxygen enter our body cells and waste products carbon dioxide and water leave the body cells by the process of :
Fill in the following blanks with suitable words :
An element is made up of only one kind of ........
Fill in the following blanks with suitable words :
The elements which are sonorous are called ..........................
Which of the following substances are elements ?
Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine
Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.
If 25 mL of acetone is present in 150 mL of its aqueous solution, calculate the concentration of solution.
Fill in the following blank :
Milk is a .................... solution but vinegar is a .................... solution.
Define solute.
What do you understand by the statement " the solubility of copper sulphate in water at 20°C is 20.7 g" ?
Differentiate between a saturated and an unsaturated solution. How will you test whether a given solution is saturated or not ?
Name the process by which all the dye can be recovered from black ink.
Describe the method of separating a mixture containing common salt, sand and ammonium chloride.
The technique which is used to separate particles of a solid suspended in a liquid quickly is called :
Stars including Sun are covered in ______.
You want to wear your favourite shirt to a party, but the problem is that it is still wet after a wash. What steps would you take to dry it faster?
Complete the following table:
| S.No. | CELSIUS | KELVIN |
| 1. | 90°C | 363 K |
| 2. | ______ | 283 K |
| 3. | 63 °C | ______ |
| 4. | 250°C | ______ |
| 5. | ______ | 303 K |
The movement of particles in liquids is ______.
The fluidity of solids: ______.
