CHEMISTRY THINGEYYYYYYYYYYYYYYYYY (1).pdf

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1. Pure and Impure
Substances Efforts By: Avni, Shreya, Bhavya,
Navya, Rishika

2. Content
Compound
Mixtures
Difference between
compounds and mixtures
Chemical Changes
Physical Changes
Difference between Chemical
and Physical changes

3. Compounds A compound is a pure substance formed when
two or more different elements are chemically
combined in a fixed ratio. This combination results
in a substance with properties distinct from its
constituent elements. Compounds can be
represented by a chemical formula.

4. Mixtures A mixture is a combination of two or more substances that are physically
combined but not chemically bonded. Each substance in a mixture retains its
own chemical identity and properties, and they can be separated by physical
means. Mixtures can be broadly classified into two types:
Homogeneous Mixtures
Heterogeneous Mixtures

5. Mixture Compound
Elements or componds are mixed
together to form mixture
A mixture has a variable
composition
Mixture shows the property
of constituent substances
The constituent can be separated
by physical changes
Elements react to form
new compunds
The composition of each new
subatance is always fixed
The new substance has
completely different properties
The constituents can only be sparated
by chemical or electrochemical reaction

6. Chemical changesA chemical change is a process where
one or more substances are
transformed into new substances with
different chemical properties. This
transformation involves a
rearrangement of atoms and the
breaking and forming of chemical bonds

7. Physical ChangesA physical change is a change in the
form or appearance of a substance, but
not in its chemical composition. In
other words, the substance remains the
same substance, even though it may
look different. These changes are
usually reversible and do not result in
the formation of new substances.

8. Chemical ChangesPhysical Changes No new substance is formed, only
physical appearance changes. Properties of the substance remain the
same before and after change. Energy change is small, often just
heat absorbed or released. Usually reversible, like water freezing
and melting again. Properties of the original substance are
completely altered. Energy change is large, often involving
light, heat, or sound. Mostly irreversible, like wood burning
into ash and gases. New substances with different
properties are formed.

9. Overview Compounds are substances formed
by elements combining chemically,
while mixtures are just physical blends
of substances. Physical changes only
alter form without creating something
new, but chemical changes result in
new substances with different
properties.

10. Trivia
Time!!!

11. Did you know??? Alloys like brass and bronze are
mixtures but behave like pure
substances.
Tyndall effect helps us identify
colloids, and it’s why sky looks blue.
Air is a homogeneous mixture, but
clouds make it temporarily
heterogeneous.

12. Quiz
Time!!

13. Q1. A sample of copper sulfate crystals is heated. The blue crystals lose water and
turn white. On further heating, a black solid and a gas are formed.
Identify which part of the process is a physical change and which is a chemical
change. Q2. Which of the following are physical irreversible changes?
1.Formation of slaked lime from quick lime
2. Burning of a candle
3. Plucking of Leaves
4. Breaking of glass tumbler
5. Direct conversion of solid to gas
a. 1, 2, and 4
b. 3 and 4
c. 1, 2, and 5
d. 4, and 5

14. Q3. When magnesium ribbon burns in air, it forms a white ash of magnesium
oxide. Compare this reaction with the mixing of iron filings and sulfur.
a) Which is a chemical change?
b) Which is a mixture and which is a compound?
c) How would you experimentally distinguish between the two final
products?

15. Citations Difference B/W Physical and Chemical Change
https://www.google.com/search?
q=4+difference+between+physical+and+chemical+change&rlz=1C5CHFA_enIN1132IN1135&oq=4+diff+between+&gs_lcrp=EgZjaHJvbWUqCQgDE
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AAGA0YgAQyCQgIEAAYDRiABDIJCAkQABgNGIAE0gEIOTA1NWowajeoAgCwAgA&sourceid=chrome&ie=UTF-8t
Unknown Facts
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q=facts+other+than+ncert+book+class+9++in+chapter+is+matter+around+us+pure+give+unknown+facts&sca_esv=78b5cc96a5d77d7c&rlz=1C
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EP4pPD4QY&ved=0ahUKEwiOrYnDo5yPAxW5xTgGHeLJMGwQ4dUDCBE&uact=5&oq=facts+other+than+ncert+book+class+9++in+chapter+is+ma
tter+around+us+pure+give+unknown+facts&gs_lp=Egxnd3Mtd2l6LXNlcnAiW2ZhY3RzIG90aGVyIHRoYW4gbmNlcnQgYm9vayBjbGFzcyA5ICBpbiBj
aGFwdGVyIGlzIG1hdHRlciBhcm91bmQgdXMgcHVyZSBnaXZlIHVua25vd24gZmFjdHMyBBAhGApIiktQ5AtY1CJwAXgBkAEAmAH3AaABsw6qAQUwLjk
uMrgBA8gBAPgBAZgCBqAC5AbCAgoQABiwAxjWBBhHmAMAiAYBkAYIkgcFMS40LjGgB8sqsgcFMC40LjG4B9gGwgcHMC41LjAuMcgHEw&sclient=g
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16. Thank
you!Do you have any questions?