Advertisements
Advertisements
प्रश्न
Fill in the blank
All matter is made up of tiny particles called ______
Advertisements
उत्तर
All matter is made up of tiny particles called atoms.
APPEARS IN
संबंधित प्रश्न
What are molecules ?
What are the two conditions for the interconversion of states of matter ?
All kinds of matter
Name two processes which provide the best evidence for the motion of particles in matter.
An inflated balloon full of air goes down slowly (becomes smaller and smaller slowly) even though the knot at the mouth of the balloon is airtight. And after a week all the air has escaped from the balloon. Explain how the air particles got out of the balloon.
When extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.
- What could particles X be ?
- What do you think liquid Y is ?
- What is the zig-zag movement of X known as ?
- What is causing the zig-zag movement of particles X ?
- Name the scientist who discovered this phenomenon.
- What does this experiment tell us about the nature of liquid Y?
Name two solid, two liquid and two gaseous elements at the room temperature.
The property/properties which enable copper metal to be used for making electric wires is/are :
Calculate the concentration of a solution which contains 2.5 g of salt dissolved in 50 g of water.
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.
What is meant by a solution?
Which of the following represents the solubility of sugar in water at 20°C ?
State whether the following statement are true or false :
Alcohol can be separated from a mixture of alcohol and water by a separating funnel.
Name the process which can be used to purify an impure sample of copper sulphate.
Write a method to separate a mixture of sand and potash alum.
How is water purified on a large scale at water works ? Explain with the help of a labelled diagram. Name the substance which is added to kill germs in the drinking water supply ?
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 ?
Write a few lines on the blackboard with a chalk. Now observe the chalk. What changes do you see in the chalk?
Define the term matter.
Define the term matter.
