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Learning Outcomes. Through experimentation, I can identify the indicators of chemical reactions having occurred. When two or more elements are joined together during a

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learning outcomes
Learning Outcomes
  • Through experimentation, I can identify the indicators of chemical reactions having occurred.
slide2

When two or more elements are joined together during a

chemical reaction, then a new substance called a compound is formed. The new substance usually looks different and behaves in a different way from the elements from which it was made. If elements do not react and are not joined together then a mixture is formed.

Q1. What is formed when two or more elements join together?

Q2. Is the new substance the same or different from

the elements which made it?

Q3. What is formed when the elements do not react

and join together?

Chemical Reactions

slide3
Collect the Sulphur Iron experiment card and do the experiment in pairs.

Chemical Reactions

Your teacher will demonstrate a chemical reaction between two elements, and you can try one yourself.

mixtures

iron

sulphur

Mixtures
  • Mixtures are made when substances are physically mixed together.
  • Each substance stays the same and keeps its own properties.
  • Mixtures are usually easy to separate.
compounds
Compounds

Iron sulphide

  • Compounds are made when elements react and chemically join together.
  • A new substance is formed with its own properties.
  • Compounds can be difficult to separate.

watch

http://www.youtube.com/watch?v=A5H6DVe5FAI

slide6

A mixtureof iron and sulphur particles

The sulphur and

Iron are still

Elements. They

are not joined

chemically.

They can be

separated using

a magnet

slide7

A compound between iron and sulphur particles

The elements in

the compound

cannot be

separated using

a magnet.

The elements

are chemically

joined.

naming compounds
Naming Compounds

The compounds formed in the table have a slightly

different name from the elements from which they

were made. The 1st element keeps its name, but

the 2nd element has some of its end letters changed to

-ide.

e.g. magnesium and oxygen react to form magnesium

oxide.

Q4. Name the compound formed in the reaction between Sulphur and Iron.

what elements are in these compounds
What Elements are in these Compounds?

Iron and Oxygen

Sodium and Chlorine

Copper and Sulphur

naming compounds2
Naming Compounds

Your teacher may let you try the Card

Sort for naming compounds.

Arrange yourselves into groups of 2

or 3.

Place the cards which have compound

names on the table.

Place the elements which are found in that compound under the compound name.

word equations
Word Equations

The chemical reactions can be summarised by using a

word equation.

Magnesium + Oxygen Magnesium Oxide

reactantsproduct(s)

Q5. Write down a word equation for the reaction between Iron and Sulphur.

summary
Summary

When two or more elements are joined together during a chemical reaction then a new substance called a compound is formed.

If elements do not react and are not joined together then a mixture is formed.

Copper chloride contains copper and chlorine.

Magnesium oxide contains magnesium and oxygen