Chemistry 2a

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  • Created by: JH1010
  • Created on: 20-10-15 18:52
What does the mass number and atomic number tell you?
Mass number tells you the number of protons and neutrons in the atom. The atomic number tells you the number of protons in the atom.
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What is a compound?
Two or more elements chemically bonded together
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What is ionic bonding?
Transfer of electrons between metal and non-metal atoms. The metal gives electrons to the non-metal which makes them oppositely charged ions, therefore they are attracted to each other.
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What are the properties of an ionic compound?
Giant ionic lattice. High melting and boiling points, strong electrostatic forces, conducts when molten, dissolves easily
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What is covalent bonding?
Sharing of electrons between non-metal atoms. The atoms form electron pairs so they can have the properties of a noble gas.
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Two types of bonds?
Simple molecular, and macromolecules
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Properties of the smaller bond?
Simple = very strong covalent bonds, weak inter-molecular forces, don't conduct, very low melting and boiling points
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Properties of the larger bond?
Macromolecular = very strong electrostatic forces, high melting and boiling points, don't conduct
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Explain what makes up diamond, graphite and silica. What are their properties?
Diamond is made of carbon atoms. Each atom makes 4 bonds and therefore is a very hard substance. Graphite consists o just carbon, but each carbon atom only makes 3 bonds. This means each atom has a delocalised electron meaning it can conduct
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Silica
Made up of oxygen and silicon. This makes sand.
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What is important to a metallic structure?
Delocalised electrons because that is what makes them good conductors
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Why are alloys harder than pure metals?
Alloys have different sized atoms. This makes it hard for layers to slide over each other therefore making the substance harder.
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What are smart materials?
Smart materials behave differently depending on the conditions. For example, nitinol can be bent and twisted when cool. When twisted too much it will stay that shape. However, when it is heated it returns to a 'remembered' shape.
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Other cards in this set

Card 2

Front

What is a compound?

Back

Two or more elements chemically bonded together

Card 3

Front

What is ionic bonding?

Back

Preview of the front of card 3

Card 4

Front

What are the properties of an ionic compound?

Back

Preview of the front of card 4

Card 5

Front

What is covalent bonding?

Back

Preview of the front of card 5
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