chemical reactions tlc
DESCRIPTION
Tenzin Liddy CorlettTRANSCRIPT
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By Tenzin Liddy-Corlett
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Elements and Atoms
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What is an Element? An Element is a type of substance that is made from only one type of Atom.
E.g. The Element hydrogen is made up of atoms that have one single proton and one single electron.
If you change the number of protons an atom has, you are changing the type of element it is.
Scientists know that there are up to 118 different types of elements, but 9 are unnamed and there could be more to discover.
The Element Gold.
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Periodic TableThe Periodic Table is used to show all the different types of atoms. It has all of the different types of Elements from the well-known elements Gold, Silver and Copper to some of the elements that you can only see for a few seconds in meitnerium, darmstadtium and ununquadium.
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What is an Atom?
An Atom is the basic elements of anything.
Atoms consist of one proton, one electron and one neutron
An Atom is the smallest substance that an element can be divided into
The Atoms of a Crystal
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Metals andNon-metals
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Metals
Metals are the densest of all elements They are solid at room temperature Metals are a good source of energy and
heat Metals can be shaped into different
shapes and sizes which is why they are used in a lot of everyday products
Most elements are metals
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Non-metals
Non-metals are poor conductors of energy and heat
Even though they are a solid, they are brittle
You can’t change their shapes and sizes They can be a solid, liquid or gas
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Compounds
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What are Compounds?
Compounds contain two or more different elements combined in a chemical form to make a pure chemical substance
The simplest form of a compound is a molecule
Compounds can be held together by covalent bonds or ionic bonds or metallic bonds
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Chemical Reactions
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What are Chemical Reactions Chemical Reactions happen when
two or more molecules interact and something happens
A chemical change must happen You must start with one molecule
and change it into another
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Examples of Chemical Reactions
When Hydrogen combines with oxygen they create water (H2O)
A steel garbage can rusting. The rusting happens because the iron comes into contact with oxygen and a reaction occurs
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Things that can effect Reaction Rates
Temperature Concentrations of reactants Catalysts Surface area of a solid reactant Pressure of gaseous reactants or
products