1. Name the smallest particle from which matter
is made up of. atoms
2. What are molecules ?
a- 21
3. Give one difference between atoms and molecules.
4. Define :
7. Classify the following into solids, liquids and
gases.
S
S
Oxygen, milk, common salt, wax, stone, L.P.G.,
carbon dioxide sugar, mertury, coal, blood,
2)
butter, copper, coconut oil, kerosene.
8. Give reasons :
(a) Liquids and gases flow but solids do not.
(b) A gas fills up the space available to it.
(c) The odour of scent spreads in a room.
my
(a) Intermolecular force of attraction.
2
(b) Intermolecular space.
Name the three states of matter and define them.
What are fluids ? Give two examples: hoe
All substances that can flow
27.
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Answers
Answer:
1. Atom
2.a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
3.Atoms are single neutral particles. Molecules are neutral particles made of two or more atoms bonded together.
4.Solids: Common salt, wax, stone, sugar, coal, butter, copper. Liquids: milk, mercury, blood, coconut oil. Gases: Oxygen, L.P.G, carbon- dioxide.
5.a)The molecules of liquids and gases are far apart i.e. have more gaps, intermolecular attraction force is very less as compared to solids, hence liquids and gases can flow but solids do not like gaps in solid molecules is a less and molecular force of attraction very strong
b)Intermolecular force of attraction is least and intermolecular spaces are very large, hence gases can fill up the space available to them.
c)When chemical substances such as perfume are let loose in a room, their particles mix with the particles of air. The particles of smelly gas are free to move quickly in all directions. They eventually spread through the whole room from an area of high concentration to an area of low concentration.
6.a)Solid matter is composed of tightly packed particles. A solid will retain its shape; the particles are not free to move around. Liquid matter is made of more loosely packed particles. ... Gaseous matter is composed of particles packed so loosely that it has neither a defined shape nor a defined volume.
b)Substances that can flow are called fluids. e.g. gases (oxygen, hydrogen)
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