o
- The nucleus is positively charged uu
revolve round the nucleus and balance the positive
electrically neutral.
Exercises
A. Answer the following in not more than 20 words.
1. What is matter? Give three examples of things made up of matter.
2. What do you understand by interconversion of state?
3. What is sublimation? Name two substances that sublime.
4. How does an alloy differ from a metal? Name two alloys.
5. What are atoms made of?
6. What are the electrical natures of the particles the atom is made
2. Answer the following in not more than 40 words.
1. How do solids, liquids and gases differ from one another in resp
2. What is the difference between vapours and gases?
3. Name three metals. Mention three characteristics of metals.
Answers
Answer:
1. Everything that you can hold, taste, or smell I made of matter. Matter makes up everything you see including Clothes, water, food , etc.
2. Matter can change from one form to another i.e from solids to liquid to gases. This phenomenon of change of matter from one State to another is know as Interconversion of the states of matter.
3. Substance that sublime are Camphor and Ammonium chloride. Sublimation is the change of matter. Through sublimation substance change from solid to gas.
4. alloys is a mixture of two or more metals .eg. brass, copper.
5. An atom is made up of three subatomic particles called Protons Neutron and electron.
6. Atoms are composed of particles: proton positively charged, electron negative charged and Neutron neutrally charged.