C2 Small Covalent Molecules OCR Gateway (9-1)

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  • Created by: Aleena
  • Created on: 09-04-18 12:21
What is a covalent bond?
a shared pair of electrons
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Why are covalent bonds strong?
Because there's a strong electrostatic attraction between the positive nuclei of the atoms & the negative electrons in each shared pair
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Why do small covalent molecules have low melting & boiling points?
Atoms within the molecules are held together by strong covalent bonds but there's weak intermolecular forces between these molecules-so little energy is required to separate these molecules & overcome forces-why there's low melting/boiling points
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Most small covalent molecules are at which states at room temperature?
they are usually gases or liquids at room temperature
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Can these molecules conduct electricity?Why?
No because they don't have free electrons or ions-i.e there's no overall electric charge
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What are the pros and cons to a ball and stick model?(its a 3D model)
help you visualise structure of these molecules and more realistic than 2D drawings. But theer aare massive gaps between electrons-in reality this is where the electron clouds would be interacting.Bonds aren't sticks & you can't see bond strength
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Other cards in this set

Card 2

Front

Why are covalent bonds strong?

Back

Because there's a strong electrostatic attraction between the positive nuclei of the atoms & the negative electrons in each shared pair

Card 3

Front

Why do small covalent molecules have low melting & boiling points?

Back

Preview of the front of card 3

Card 4

Front

Most small covalent molecules are at which states at room temperature?

Back

Preview of the front of card 4

Card 5

Front

Can these molecules conduct electricity?Why?

Back

Preview of the front of card 5
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