A
Short Answer Questions:
1. List the characteristics of particles of matter.
2. List the properties that decide the state of matter.
3. What is meant by melting point and boiling point of a substance?
4. What are the effects of heating on matter?
5. Give reasons:
(a) Solids are rigid and retain their shape.
(b) Liquids and gases expand on heating.
(c) A solid does not flow but a fluid flows.
Answers
Answer:
1 answer: particles of matter attract each other
particles of matter are moving continously
particles of matter have space between them
All matter is composed of very smallparticles of matter which can exist independently.
2answer: the following properties determine the state of matter: 1.the kinetic energy of particles due to their motion
2.form of attraction between its atoms
3. interparticle spaces.
3answer:the main difference between boiling and melting point is that the melting point is defined as the temperature at which solid and liquid phases are in Equilibruim where the boiling point is the temperature at vapour pressure of a liquid is equal to external pressure.
4answer:when the heat is added to substance ,the molecules and atoms vibrate faster.as atoms vibrate faster,the spaces b/w atoms increases . The motion and spacing of particles determine the state of matter of substance .the end result of increased molecular motion is that the object expands and takes up more space.
5 answer: 1. solids have a tendency to maintain their shape when subjected to force .solids may break under the force but it is difficult to change their shape so they are rigid.
2.liquid expand for the same reason, but because the bonds b/w separate molecules are usually less tight they expand more than solids .Heat causes the molecules to move faster which means that the volume of gas increases more than the volume of solids and gses .
3.liquid flows because the particles are loosely bonded than the solids where particles are closely bonded.