Http://mrged.flexinet.com.au
Download
1 / 33

Types of Chemical Change - PowerPoint PPT Presentation


  • 158 Views
  • Uploaded on

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.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Types of Chemical Change' - kael


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

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

4. Double replacement reactions




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)


1 Na reacts with 1 Cl

Formula = NaCl

View animation at

http://mrged.flexinet.com.au


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)



Rules leading to correct formula FORMULAE

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


Positive ions FORMULAE

(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


sodium fluoride FORMULAE

Chemical Formulae 1.

IONS

CHARGES

NUMBERS

Na

F

FORMULA


magnesium fluoride FORMULAE

Chemical Formulae 2.

CHARGES

IONS

NUMBERS

Mg

F

FORMULA


Chemical Formulae 3. FORMULAE

silver hydroxide

CHARGES

IONS

NUMBERS

Ag

OH

FORMULA


calcium nitrate FORMULAE

Chemical Formulae 4.

CHARGES

IONS

NUMBERS

Ca

NO3

FORMULA


ammonium carbonate FORMULAE

Chemical Formulae 5.

CHARGES

IONS

NUMBERS

NH4

CO3

FORMULA


aluminium bromide FORMULAE

Chemical Formulae 6.

CHARGES

IONS

NUMBERS

Al

Br

FORMULA


chromium sulphide FORMULAE

Chemical Formulae 7.

CHARGES

IONS

NUMBERS

Cr

S

FORMULA


Chemical Formulae 8. FORMULAE

BLANK ITEM

CHARGES

IONS

NUMBERS

FORMULA


Try these: FORMULAE

1. lithium sulphite

2. barium hydroxide

3. copper carbonate

4. hydrogen sulphide

5. magnesium nitride

6. ammonium bromide

7. aluminium oxide.


In chemistry there are millions of chemical reactions. FORMULAE

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


Synthesis (Composition) FORMULAE

C

O

O

O

O

C

In a synthesis reaction

(also known as a composition reaction),

two substances combine to form a larger substance.

+


Here are 3 synthesis reactions: FORMULAE

Hydrogen + oxygen yields water

2H2 + O2 -> 2H2O

Magnesium + nitrogen yields magnesium nitride

3Mg + N2 -> Mg3N2

Iron + sulphur yields iron(II) sulphide

Fe + S -> FeS


Decomposition FORMULAE

In a decomposition reaction, a larger substance

breaks apart and forms two or more simpler substances.


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


Some examples of decomposition reaction

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


PrecipitaReact.MOV reaction

FormWater.MOV

FORMALUMBRO.MOV

THERMITE.MOV

NitrogTriiodide.MOV

REDUCTIONCUO.MOV

6x Quicktime mov files


TRY THESE: reaction

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


Single Replacement reaction

In a single replacement reaction,

a more active element replaces

a less active element in a compound.

more reactive

less reactive


Single Replacement reaction

Here Mg is more reactive than Pb


Single Replacement reaction

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



ad