EDEXCEL Chemistry

Topic 1. Atomic structure

• 218679656.Hd (video/mp4)

1.1.1 Atoms, elements and compounds

• OBJECTIVES
• Define an atom, an element, a compound and a mixture.
• The first 20 elements in the periodic table, the elements in Groups 1 and 7
• Name compounds of these elements from given formulae or symbol equations

1.1.1 Atoms, elements and compounds

• An atom is the smallest part of an element that can exist which can not be broken down any further. Everything in the universe is made up of atom.
• The radius of an atom is 0.1 nm (1 × 10 -10 m);0.1 nm (1 × 10 -10 m).
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• Bildunterschrift: ATOM

1.1.1 Atoms, elements and compounds

• An element is a substance that is made from only one type of atom. It cannot be broken down because there is nothing to break down.
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• Bildunterschrift: ELEMENT

1.1.1 Atoms, elements and compounds

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• Bildunterschrift: ELEMENT
• You can think you elements as identical twin, they are the same but conjoined together.

1.1.1 Atoms, elements and compounds

• A compound contains two or more elements chemically combined in fixed proportions.
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• Bildunterschrift: COMPOUND- H2O

1.1.1 Atoms, elements and compounds

• K0043557 Linear Molecule Co2 (video/mp4)
• Oxygen (Einbetten)
• Bildunterschrift: HOW WATER IF FORMED
• Bildunterschrift: CO2

1.1.1 Atoms, elements and compounds

• Recognizing a element
• Each element starts with a capital letter, so to recognize an element you will only see a capital letter once (and might also be followed be a smaller case letter depending on the element name).
• Recognizing a compound
• With a compound you will see capital letter twice (which might be next to one and other or seperated by a number inbetween).
• LOOk AT THE EXAMPLES ABOVE.
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1.1.1 Atoms, elements and compounds

• A mixture consists of two or more elements or compounds not chemically combined together. The chemical properties of each substance in the mixture are unchanged.
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• Bildunterschrift: MIXTURE

1.1.1 Atoms, elements and compounds

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• Bildunterschrift: COMPOUND VS MIXTURE

1.1.1 Atoms, elements and compounds

• Examples of mixtures are pretty much everything.
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1.1.1 Atoms, elements and compounds

• About 100 different elements in the periodic table.
• Chemistry+ +5462 (video/mp4)
• Bildunterschrift: THE PERIODIC TABLE

1.1.1 Atoms, elements and compounds

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• Bildunterschrift: THE FIRST 20 ELEMENTS

1.1.1 Atoms, elements and compounds

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• Bildunterschrift: SYMBOL EQUATIONS