Question

A. Very Short Answer Questions
1. What is matter?
2. What are the three states of matter?
3. Name the physical state of matter which can be easily compressed.
4. Which diffuses faster
a liquid or a gas?
5. An inflated air balloon collapses when pricked with a pin. Which property of the
gaseous state shown by this observation?
6. Arrange the three states of matter in the order of increasing intermolecular space.
7. What is the physical state of water at 0°C, 100°C, 25°C?
8. What happens to the particles when salt is dissolved in water?
9. A substance has a definite shape as well as a definite volume. Which physical state is
represented by this statement?
10. What are the ways by which the physical state of matter can be changed?
11. Under what conditions, heat can be given to a substance without raising its temperature?
12. A substance A has a definite volume and assumes the shape of the container in which it
is kept. What is the physical state of substance A?
13. What do CNG and LPG stand for? Give one use for each.
14. What is the melting point of ice in kelvin?
15. What is dry ice?
16. State a method to liquefy atmospheric gases.
17. Name the state of matter in which particles just move around randomly because of very
weak force of attraction.
18. In which of the following three substances, do you think the particles are held together
with greatest force? A piece of chalk, a piece of ice and an iron nail.
19. What is the fourth state of matter called?
20. Explain what happens to the particles of oxygen as it is cooled down.
21. A liquid is taken in the Petri dishes A and B having radii 2.5 cm and 5 cm respectively.
In which Petri dish would evaporation occur faster?
22. Melting points of three solids A, B and C are 298 K, 310 K and 400 K respectively.
Arrange these in increasing order of force of attraction.​

Answer 1

Answer:

i hope it's helpful

Explanation:

Matter can be solid liquid and gas. Solution: Chair, air, smell , almonds, cold drinks and smell of perfume are matter because they occupy space and have mass.

Answer 2

1. Matter is that occupies space and has mass.
2. There are three states of matter: solid; liquid and gas.
3. Gas is the physical state of matter that can be easily compressed since there is large space between the particles.
4. Gases diffuse faster than liquids.
5. Due to the property of diffusion in gases an inflated air balloon deflates when pricked with a pin. Diffusion property in gases is very fast.
6. Solid > Liquid > Gas.
7. At 0°C, water exists in solid-state. We know that the freezing point of water is 0 °C. The liquid form of water starts to become solid (ice) at this temperature.
8. When salt is dissolved in water, the particles of salt disappear in water. This happens because particles of salt get adjusted in the spaces between the particles of water.
9. Solid is the substance having definite shape as well as definite volume.
10. Matter can change from one state to another if heated or cooled. If ice (a solid) is heated it changes to water (a liquid). This change is called MELTING. If water is heated, it changes to steam (a gas).
11. Heat can be given to a substance without raising its temperature,When a substance is changing its physical state[for eg from solid to liquid and liquid to gas ]. The heat energy which has to be supplied to change the state of substance is called its Latent Heat. Latent heat does not raise the temperature .
12. since substance a has definite volume and it can assume the shape of container i.e. change it's shape according to container, it is liquid in state.
13. LPG – Liquefied Petroleum Gas. CNG-Compressed Natural Gas.
14. The melting point of ice on Kelvin scale is 273 K.
15. Dry ice is the solid form of carbon dioxide. It is used primarily as a cooling agent, but is also used in fog machines at theatres for dramatic effects.
16. Atmospheric gases can be liquefied by applying pressure and lowering temperature. When enough pressure is applied, the gases are highly compressed into a small volume.
17. The state of matter in which particles just move randomly because of very weak force of attraction is Gaseous state.
18. In an iron nail the particles are tightly bound and the molecules have a great force of attraction between themself. In chalk and ice, weak hydrogen bonds are there that require very less energy to break in comparison to breaking a nail. This requires a greater force to damage an iron nail than chalk or a block of ice
19. Plasma is often called “the fourth state of matter,” along with solid, liquid and gas.
20. The particles in the gas lose kinetic energy and their speeds slow down. ... On cooling to a certain level, i.e. when the particles have lost a certain amount of energy, these forces of attraction cause the gas to change into liquid state.
21. don't know
22. The increasing order will be A < B < C .