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Types of Chemical Change PowerPoint PPT Presentation


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http://mrged.flexinet.com.au. Types of Chemical Change. You already know about,. 1.The two main types of chemical bonding. 2. Writing chemical formulas (formulae). This week we will find out about;. 1.Synthesis Reactions. 2. Decomposition reactions. 3. Single replacement reactions.

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Types of Chemical Change

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Types of chemical change

http://mrged.flexinet.com.au

Types of Chemical Change


Types of chemical change

You already know about,

1.The two main

types of chemical bonding

2. Writing chemical formulas

(formulae)


Types of chemical change

This week we will find out about;

1.Synthesis Reactions

2. Decomposition reactions

3. Single replacement reactions

4. Double replacement reactions


Types of chemical change

The Periodic Table


Types of chemical change

Types of chemical bonding. Revision


Types of chemical change

Ionic Bonding

This type of bonding

will occur when a metal reacts with a non -metal

It always involves a complete transfer of electrons

  • It always produces IONS (charged particles)


Types of chemical change

1 Na reacts with 1 Cl

Formula = NaCl

View animation at

http://mrged.flexinet.com.au


Types of chemical change

Covalent Bonding

This type of bonding

will occur when a non- metal reacts with a non -metal

Here both atoms will share electrons

  • It always produces molecules (particles with no charge)


Types of chemical change

In this section we will find out how to write chemical FORMULAE


Types of chemical change

Rules leading to correct formula

1. Positive ions (cations) can join to negative ions (anions)

2. Positive ions usually form the first part of the name (99% cases)

3. If the formula is correct there is no overall charge

Please copy into your exercise books

4. If you have more than one polyatomic ion it is placed inside brackets


Types of chemical change

Positive ions

(Cations)

Negative ions

(Anions)

+ 1

- 1

fluoride F

sodium Na

chloride Cl

potassium K

bromide Br

hydroxide OH

hydrogen H

Essential training ions

nitrate NO3

lithium Li

silver Ag

hydrogencarbonate HCO3

ammonium NH4

- 2

carbonate CO3

magnesium Mg

+2

oxide O

calcium Ca

sulphide S

barium Ba

zinc Zn

sulphate SO4

iron(11) Fe

sulphite SO3

copper Cu

chromate CrO4

+3

- 3

nitride N

aluminium Al

chromium Cr

phosphate PO4

iron(111) Fe


Types of chemical change

sodium fluoride

Chemical Formulae 1.

IONS

CHARGES

NUMBERS

Na

F

FORMULA


Types of chemical change

magnesium fluoride

Chemical Formulae 2.

CHARGES

IONS

NUMBERS

Mg

F

FORMULA


Types of chemical change

Chemical Formulae 3.

silver hydroxide

CHARGES

IONS

NUMBERS

Ag

OH

FORMULA


Types of chemical change

calcium nitrate

Chemical Formulae 4.

CHARGES

IONS

NUMBERS

Ca

NO3

FORMULA


Types of chemical change

ammonium carbonate

Chemical Formulae 5.

CHARGES

IONS

NUMBERS

NH4

CO3

FORMULA


Types of chemical change

aluminium bromide

Chemical Formulae 6.

CHARGES

IONS

NUMBERS

Al

Br

FORMULA


Types of chemical change

chromium sulphide

Chemical Formulae 7.

CHARGES

IONS

NUMBERS

Cr

S

FORMULA


Types of chemical change

Chemical Formulae 8.

BLANK ITEM

CHARGES

IONS

NUMBERS

FORMULA


Types of chemical change

Try these:

1. lithium sulphite

2. barium hydroxide

3. copper carbonate

4. hydrogen sulphide

5. magnesium nitride

6. ammonium bromide

7. aluminium oxide.


Types of chemical change

In chemistry there are millions of chemical reactions.

But most reactions can be classified as

one of four types of reactions:

Synthesis: A + B -> AB

Decomposition: AB -> A + B

Single Replacement: A + BC -> AC + B

Double Replacement: AB + CD -> AD + CB


Types of chemical change

Synthesis (Composition)

C

O

O

O

O

C

In a synthesis reaction

(also known as a composition reaction),

two substances combine to form a larger substance.

+


Types of chemical change

Here are 3 synthesis reactions:

Hydrogen + oxygen yields water

2H2 + O2 -> 2H2O

Magnesium + nitrogen yields magnesium nitride

3Mg + N2 -> Mg3N2

Iron + sulphur yields iron(II) sulphide

Fe + S -> FeS


Types of chemical change

Decomposition

In a decomposition reaction, a larger substance

breaks apart and forms two or more simpler substances.


Types of chemical change

The first thing you may notice about a decomposition reaction

is that it is the complete opposite of a synthesis reaction.

In fact many synthesis reactions

can be reversed into a decomposition reaction.

When you burn hydrogen gas,

the hydrogen combines with oxygen to produce water.

2H2 + O2 -> 2H2O

With an electrical current, water can be

decomposed into hydrogen and oxygen gas.

2H2O -> 2H2 + O2


Types of chemical change

Some examples of decomposition

Heat copper carbonate and it will decompose

(Refer to flash animation .swf)

CuCO3 -> CuO + CO2

(Most carbonates decompose producing the oxide and carbon dioxide)

Heat lead(11) hydroxide and it will decompose

Pb(OH)2 -> PbO + H2O


Types of chemical change

PrecipitaReact.MOV

FormWater.MOV

FORMALUMBRO.MOV

THERMITE.MOV

NitrogTriiodide.MOV

REDUCTIONCUO.MOV

6x Quicktime mov files


Types of chemical change

TRY THESE:

1. Watch all 12 mov files (available on SET drive)

2. Classify each as either, synthesis, decompostion, single of double replacement reactions

3. Write a correct chemical equation for each!

Some may require some research


Types of chemical change

Single Replacement

In a single replacement reaction,

a more active element replaces

a less active element in a compound.

more reactive

less reactive


Types of chemical change

Single Replacement

Here Mg is more reactive than Pb


Types of chemical change

Single Replacement

If fluorine gas is bubbled through a solution of

potassium chloride, the fluorine will replace the chlorine.

This reaction can be represented as follows;

2KCl + F --> 2KF + Cl

No surprise! fluorine is more reactive than chlorine


Types of chemical change

Please note this PPT may be updated over the weekend

Mr G


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