Elements,
Compounds
and Mixtures
Learning Objectives
• At the end of the lesson, students should
be able to:
– describe the differences between elements,
c...
Elements
• Pure substance that cannot be split up into two or more
simpler substances.
• Can be represented using chemical...
Properties of Metals and Nonmetals
• Elements can be classified into metals and nonmetals.
• A dividing staircase line sep...
Properties of Metals and Nonmetals
Metals

Non-metals

shiny appearance

dull appearance

solids at room temperature.
(exc...
Wake Up Call 1
1. Which of the following contains three
elements?
A
B
C
D

argon, magnesium, phosphorus
brass, phosphorus,...
Wake Up Call 1
2. Which of the following is an element?
A
B
C
D

CO
H2
HCl
HI
Wake Up Call 1
3. (a) How many types of elements are
there in sulfuric acid, H2SO4?

(b) How many atoms are there in one
m...
Compounds and Mixtures
• A compound is a substance that is made
up of two or more elements chemically
combined together.
•...
Compounds and Mixtures
Compound

Mixture

1)

Formation

A chemical reaction
takes place when a
compound is formed,
usuall...
Compounds and Mixtures
Compound

Mixture

4)

Properties

Has its own physical
and chemical properties
which are different...
Wake Up Call 2
1. Classify the following substance as an element, a
compound or a mixture.
Substance
H2O
Copper (Cu)
Steel...
Comparing Elements, Compounds
and Mixtures
Elements
% composition by
mass
Atoms
Heating /
combustion

Can be separated
by ...
Comparing Elements, Compounds
and Mixtures
Elements
Some parts
dissolve in water
and some parts
do not
Examples

Pure / Im...
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Elements Compounds and Mixtures

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Elements Compounds and Mixtures

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  • @Elfian_sufi You can refer to the periodic table to help you. There is no need to 'understand' the metal names. All you need to know is if a substance is an element, compound or mixture. If it is an element, then you need to just check if it is a metal or non-metal based on its relative position in the periodic table. Hope this clarifies.
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  • Ms Gorgeous Kong,the wake up call must read the periodic table first?
    because it is quite hard to understand the metal's names
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Transcript of "Elements Compounds and Mixtures"

  1. 1. Elements, Compounds and Mixtures
  2. 2. Learning Objectives • At the end of the lesson, students should be able to: – describe the differences between elements, compounds and mixtures
  3. 3. Elements • Pure substance that cannot be split up into two or more simpler substances. • Can be represented using chemical symbols (refer to the Periodic Table) • Elements can exist as either atoms or molecules. • Atoms are the smallest particles of an element that have the chemical properties of that element. • Molecules are a group of two or more atoms that are chemically combined.
  4. 4. Properties of Metals and Nonmetals • Elements can be classified into metals and nonmetals. • A dividing staircase line separates the metals from the non-metals in the periodic table. dividing line Figure 1. Periodic table showing metals and non-metals
  5. 5. Properties of Metals and Nonmetals Metals Non-metals shiny appearance dull appearance solids at room temperature. (except mercury) either gases, volatile liquids or solids with low melting points at room temperature. (except carbon) Malleable, ductile, sonorous Brittle if solid High melting and boiling points Low melting and boiling points Good conductors of heat Poor conductors of heat Good conductors of electricity in all states of matter Poor conductors of electricity (except carbon) Elements that have properties of both metals and non-metals e.g. silicon are called metalloids.
  6. 6. Wake Up Call 1 1. Which of the following contains three elements? A B C D argon, magnesium, phosphorus brass, phosphorus, potassium chlorine, air, nitrogen petrol, alcohol, water
  7. 7. Wake Up Call 1 2. Which of the following is an element? A B C D CO H2 HCl HI
  8. 8. Wake Up Call 1 3. (a) How many types of elements are there in sulfuric acid, H2SO4? (b) How many atoms are there in one molecule of sulfuric acid H2SO4?
  9. 9. Compounds and Mixtures • A compound is a substance that is made up of two or more elements chemically combined together. • A mixture consists of two or more substances (elements or compounds) that are not chemically combined together.
  10. 10. Compounds and Mixtures Compound Mixture 1) Formation A chemical reaction takes place when a compound is formed, usually there is an energy change (e.g. heat is given off). No chemical change takes place when a mixture is formed, usually there is little or no energy change. 2) Composition Has fixed composition Has variable by mass. E.g. H2O – 2 composition by mass. units of hydrogen, 1 unit of oxygen 3) Melting and Boiling point Has fixed melting and boiling points. Has variable melting and boiling points (melt and boil over a range of temperatures)
  11. 11. Compounds and Mixtures Compound Mixture 4) Properties Has its own physical and chemical properties which are different from its elements – i.e. hydrogen and oxygen are gases at rtp, water is a liquid at rtp. Does not have its own properties, it has the same properties as its components 5) Separation The constituents (elements) can only be separated by chemical methods. The constituents can be separated from one another by physical methods. 6) Arrangement of atoms A compound of 2 elements A mixture of 2 elements
  12. 12. Wake Up Call 2 1. Classify the following substance as an element, a compound or a mixture. Substance H2O Copper (Cu) Steel Ice (H2O) O2 C2H5OH Carbon Brass NO2 Air Seawater Element, compound or mixture?
  13. 13. Comparing Elements, Compounds and Mixtures Elements % composition by mass Atoms Heating / combustion Can be separated by physical means? Appearance Compounds Mixtures Fixed/constant Fixed/constant Variable One type Two or more different types Two or more different types Only one product formed or oxidises to one other substance May have two or more products formed / decomposes May have two or more products formed No No Yes Only one colour Only one colour Can be two or more colours
  14. 14. Comparing Elements, Compounds and Mixtures Elements Some parts dissolve in water and some parts do not Examples Pure / Impure Compounds Mixtures Not possible Not possible Possible Metals, Na, Ca, Ar, Ne, H2, Cl2, O3, P4, S8 HCl, CO2, H2O. Na2SO4 Crude oil (petroleum), alloys (brass, steel, bronze), air, solutions, fractions from crude oil (diesel, petrol, bitumen) Pure Pure impure

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