S2 SCIENCE CHEMICAL REACTIONS

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