Advertisements
Advertisements
प्रश्न
What are pure substances ? Give two examples of pure substances.
Advertisements
उत्तर
Pure substances are made up of same type of particles or atoms. All the elements and compounds are pure substances because they contain the same kinds of particles.
Examples: Hydrogen, carbon dioxide
APPEARS IN
संबंधित प्रश्न
Out of solids, liquids and gases, which one has :
- maximum movement of particles ?
- maximum interparticle attractions ?
- minimum spaces between particles ?
Name the scientist who studied the movement of pollen grains suspended in water through a microscope. What is this phenomenon known as?
Name a non-metal which is a good conductor of electricity.
Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.
A solution contains 5.6 mL of alcohol mixed with 75 mL of water. Calculate the concentration of this solution.
Define Sol and give one example.
What is meant by the concentration of a solution ?
21.5 g of sodium chloride dissolves in 60 g of water at 25°C. Calculate the solubility of sodium chloride in water at that temperature.
What is a suspension ? Give two examples of suspensions.
What is a colloid ? Give two examples of colloids (or colloidal solutions)
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.
Fill in the following blanks with suitable words :
A heterogeneous mixture of liquid and solid is conveniently separated by...............
How will you separate iron pins from sand ?
Name the metals that are used in jewellery.
Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions
A teabag placed in a cup of hot water will diffuse into the water.
Evaporation does form bubbles.
Examples of foam are ______.
Define the term matter.
