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S2 SCIENCES2 SCIENCE
CHEMICAL REACTIONSCHEMICAL REACTIONS
REVISIONREVISION
An ElementAn Element
• A A simplesimple type of substance that can’t type of substance that can’t be broken down into other substances.be broken down into other substances.
• A substance that contains only one A substance that contains only one typetype of atom. of atom.
• Elements are listed on the periodic tableElements are listed on the periodic table
The Periodic TableH He
Li Be B C N O F Ne
Na Mg Al Si P S Cl Ar
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
Fr Ra Ac
Solids, Liquids & Gases
AcRaFr
RnAtPoBiPbTlHgAuPtIrOsReWTaHfLaBaCs
XeITeSbSnInCdAgPdRhRuTcMoNbZrYSrRb
KrBrSeAsGeGaZnCuNiCoFeMnCrVTiScCaK
ArClSPSiAlMgNa
NeFONCBBeLi
HeH
Q1. Metal or non-metal?Q1. Metal or non-metal?
AcRaFr
RnAtPoBiPbTlHgAuPtIrOsReWTaHfLaBaCs
XeITeSbSnInCdAgPdRhRuTcMoNbZrYSrRb
KrBrSeAsGeGaZnCuNiCoFeMnCrVTiScCaK
ArClSPSiAlMgNa
NeFONCBBeLi
HeH
Q3. Metal or non-metal?Q3. Metal or non-metal?
AcRaFr
RnAtPoBiPbTlHgAuPtIrOsReWTaHfLaBaCs
XeITeSbSnInCdAgPdRhRuTcMoNbZrYSrRb
KrBrSeAsGeGaZnCuNiCoFeMnCrVTiScCaK
ArClSPSiAlMgNa
NeFONCBBeLi
HeH
Q4. Metal or non-metal?Q4. Metal or non-metal?
AcRaFr
RnAtPoBiPbTlHgAuPtIrOsReWTaHfLaBaCs
XeITeSbSnInCdAgPdRhRuTcMoNbZrYSrRb
KrBrSeAsGeGaZnCuNiCoFeMnCrVTiScCaK
ArClSPSiAlMgNa
NeFONCBBeLi
HeH
Q5. Solid, liquid or gas?Q5. Solid, liquid or gas?
AcRaFr
RnAtPoBiPbTlHgAuPtIrOsReWTaHfLaBaCs
XeITeSbSnInCdAgPdRhRuTcMoNbZrYSrRb
KrBrSeAsGeGaZnCuNiCoFeMnCrVTiScCaK
ArClSPSiAlMgNa
NeFONCBBeLi
HeH
Q6. Solid, liquid or gas?Q6. Solid, liquid or gas?
AcRaFr
RnAtPoBiPbTlHgAuPtIrOsReWTaHfLaBaCs
XeITeSbSnInCdAgPdRhRuTcMoNbZrYSrRb
KrBrSeAsGeGaZnCuNiCoFeMnCrVTiScCaK
ArClSPSiAlMgNa
NeFONCBBeLi
HeH
Q7. Solid, liquid or gas?Q7. Solid, liquid or gas?
AcRaFr
RnAtPoBiPbTlHgAuPtIrOsReWTaHfLaBaCs
XeITeSbSnInCdAgPdRhRuTcMoNbZrYSrRb
KrBrSeAsGeGaZnCuNiCoFeMnCrVTiScCaK
ArClSPSiAlMgNa
NeFONCBBeLi
HeH
Q9. Solid, liquid or gas?Q9. Solid, liquid or gas?
AcRaFr
RnAtPoBiPbTlHgAuPtIrOsReWTaHfLaBaCs
XeITeSbSnInCdAgPdRhRuTcMoNbZrYSrRb
KrBrSeAsGeGaZnCuNiCoFeMnCrVTiScCaK
ArClSPSiAlMgNa
NeFONCBBeLi
HeH
SulphurSulphur IronIron
Elements
• Both iron and sulphur contain only one type of atom
What is a Chemical Change?
In a chemical change, a new substance is made. This is an
irreversible process.
Reactants Products
Acid + Metal Hydrogen + Salt
How to spot a chemical reaction
When substances are mixed, a chemical change has taken place if…
• Bubbles are given off• Mixture warms up or cools down• An original substance disappears or
a new substance appears• A colour change occurs
A MixtureA Mixture
• A substance that contains more than one type of atom that are not chemically bonded (joined).
• A mixture can be easily separated.
Mixture of iron and Sulphur
A CompoundA Compound
• A substance that contains more than one type of atom chemically bonded together.
• Compounds are formed when elements react together
• Compounds can not be easily separated
Iron SulphideIron Sulphide
Testing for Hydrogen
“POP”
Hydrogen is a gas that burns with a squeaky pop!
Testing for Oxygen
Place a glowing splint in the gas
Glowing splint
Testing for Oxygen
Place a glowing splint in the gas
Glowing splint
Testing for Oxygen
Oxygen will relight the splint
Testing for Carbon Dioxide
Carbon Dioxide will put out a flame
Testing for Carbon Dioxide
Carbon Dioxide will put out a flame