States of Matter

Q.

We can get the smell of perfume sitting several meters away, why?

Q.

What is the physical state of water at ${25}^{\mathrm{o}}\mathrm{C}$.

Q.

What is plasma and what are it's examples .

Q.

State three differences between solids and liquids?

Q.

Define

1. rigidity
2. compressibility
3. density and
4. fluidity

Q.

Sugar and salt kept in different jars gain the shape of their respective jars. Are they solid? justify your answer.

Q.

Explain the three states of matter with respect to their force attraction and intermolecular space

Q.

Explain the term RIGIDITY, COMPREESIBILITY, FLUIDITY.

Q.

Give reason -. A gas fills completely in the vessel in which it is kept.

2. A gas exerts pressure on the walls of the container.

Q.

The boiling point of water on kelvin scale is :

1. 573 K

2. 273 K

3. 373 K

4. 100 K

Q.

State the five main physical properties of water.

Q.

What is the general name of :

(a) rigid form of matter ?

(b) fluid form of matter ?

Q. Question 2 (b)
(b) Comment upon the following: rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy and density

Q.

Question 15
The non S I and S I units of some physical quantities are given in column A and column B respectively. Match the units belonging to the same physical quantity.
$\begin{array}{cc}\text{(A)}& \text{(B)}\\ \text{(a) degree Celsius}& \text{(i) kilogram}\\ \text{(b) centimeter}& \text{(ii) pascal}\\ \text{(c) gram per centimeter cube}& \text{(iii) metre}\\ \text{(d) bar}& \text{(iv) Kelvin}\\ \text{(e) milligram}& (\text{v) kilogram per metre cube}\end{array}$

Q.

Which matter has no fixed shape but have fixed volume?

Q.

Define the following terms..

* Compressibility

* Fluidity

* Kinetic energy

* Diffusion

Q.

The scientists now say that there are actually five states of matter A, B, C, D and E. The state A has a fixed volume but no fixed shape. The sate B can be compressed very easily by applying pressure and state C has a fixed shape as well as a fixed volume. The state D is a mixture of free electrons and ions whereas state E is named after an Indian scientist and a famous Physicist.

(a) Name the physical states (i) A (ii) B (iii) C (iv) D and (v) E.

(b) Name one substance belonging to state C which can directly change into vapours on heating. What is this process known as?

(c) Name one substance which normally belongs to state B but whose solid form changes directly into a gaseous state.

(d) Name the most common substance belonging to state A.

(e) Which state of matter makes the sun and other stars to glow?

Q.

Which characteristic property of particles of matter is illustrated by the phenomenon of diffusion ?

Q.

Two elements that are solid at room temperature?

Q. Which of the following is a process of conversion of plasma into gaseous state of matter?

1. Sublimation
2. Deposition
3. Deionisation
4. Ionisation

Q. A diver is able to cut through water in swimming pool. Which property of matter does this observation show

Q. Which of the following mixtures cannot be separated by sublimation?​
A. Chalk and mothball
B. Ammonium chloride and sand
C. Oil and water

Q.

Give a reason for the following observations.

(a) Naphthalene balls disappear with time without leaving any solid.
(b) We can get the smell of perfume sitting several meters away. [3 MARKS]

Q.

What is the difference between plasma and gas

Q. Based on intermolecular force of attraction arrange solid, liquid and gas in ascending order.

1. Solid<liquid< gas
2. Liquid<Solid< Gas
3. Gas< liquid<solid
4. Liquid<Gas< Solid

Q.

How does the rate of diffusion increase with increase in pressure?

Q. Give one example of diffusion of gases in a liquid.

Q.

Q.

The force of cohesion is maximum in

1. Solids

2. Liquids

3. Gases

Q.

2 ml of dettol is added to a beaker containing 500 ml of water and stirred. State four observations that you make. [2 MARKS]