b Compounds Specific Aim To appreciate the idea pure substances to know about Elements and Compounds to be able to identify both Elements and compounds present around us to know ID: 927082
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Slide1
Introduction
Teaching Points: (a) Elements
(
b) Compounds
Specific
Aim : To appreciate the idea pure substances, to know about Elements and
Compounds to
be able to identify both Elements and compounds present around us, to know
about Periodic
Table.
Slide2Some Questions and Answers
Question
:
If I break a Chalk Pencil, what do I get?
Answer:
I get few pieces of Chalk.
Question
:
If I take a piece of Chalk pencil and keep on breaking it, eventually what do I get?
Answer:
I get the Chalk powder.
Question
:
Can I further break the particles of Chalk powders?
Answer:
Yes. The Small particles are called Atom
Slide3Some Questions and Answers
Give an example of a chemical reaction.
Answer:
2
H
2
+
O
2
→
2H
2
O
Question:(Teacher)
What
is the structural difference between
H
and H
2
O?
Answer:
H is the Symbol of Hydrogen and H
2
O is formula of water.
Slide4Introduction
You know cadets;
All substances are made of some tiny particles
Different substances have different types of particles.
Today, we shall discuss about What are Elements and Compounds?
Slide5Elements and Compounds
Elements:
An Element is a simple substance that cannot be broken be broken down to simpler substances.
There are 118 elements found on the Earth.
Examples: Hydrogen, Helium, Lithium, Beryllium, Boron, Carbon, Oxygen, Nitrogen, Fluorine, Neon etc
.
Compounds:
When two or more elements combine chemically, they form Compounds.
Carbon(C) and Oxygen (O) combine chemically to form carbon-di-Oxide (CO
2
).
C + O
2
→
CO
2
Hydrogen (H) and Oxygen (O) combine chemically to form Water (H
2
O).
2H
2
+ O
2
→
2H
2
O
Slide6Properties of Elements and Compounds
Properties of Elements and Compounds:
Each element has certain specific properties. The properties change when the elements combine chemically
Hydrogen (H) and Oxygen (O) combine chemically to form Water (H
2
O
).
2H
2
+ O
2
→ 2H
2
O
Both
Hydrogen and Oxygen are
Colurless
,
Odourless
gases.
Oxygen supports combustion, but it does not burn.
Hydrogen can burn but it does not help others to burn.
Water, the compound formed by them, is a
colourless
,
Odourless
liquid that neither burns nor allows other substances to burn. We can use water to put out fire.
Slide7Some Questions And Answers
Question
:
What are Elements?
Answer
:
An
Element is a simple substance that cannot be broken down to simpler substances.
Question
:
How many elements are found on Earth?
Answer
:
There are 118 elements found on Earth.
Question
:
Name five elements?
Answer
:
The
names of five elements are Oxygen, Nitrogen, Gold, Silver and Copper.
Question
:
What are compounds?
Answer
:
When two or more elements combine chemically, they form Compounds.
Slide8Some Questions And Answers
Give three examples of compounds.
Answer
:
The names of three compounds are
Carbon-di-Oxide(CO
2
)
,Sodium Chloride (
NaCl
)
and
Water (H
2
O
)
.
Question
:
Give two examples of Chemical change
Answer
:
Carbon(C) and Oxygen (O) combine chemically to form carbon-di-Oxide (CO
2
).
C + O
2
→
CO
2
Hydrogen (H) and Oxygen (O) combine chemically to form Water (H
2
O).
2H
2
+ O
2
→
2H
2
O
Slide9Question?
1
. Question
:
Properties change when elements form compounds. Explain.
Answer
:
Hydrogen (H) and Oxygen (O) combine chemically to form Water (H
2
O).
2
H
2
+ O
2
→
2H
2
O
Both Hydrogen and Oxygen are
Colourless
,
Odourless
gases. Oxygen supports combustion, but it does not burn. Hydrogen can burn but it does not help others to burn.
Water
, the compound formed by them, is a
colourless
,
Odourless
liquid that neither burns nor allows other
substances
to burn. We can use water to put out fire.