C2.2.5 - Simple Molecules Flashcards

1
Q

What is a covalent bond?

A

A shared pair of electrons

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2
Q

When do covalent bonds form?

A

They form between 2 non-metal atoms when they get close enough to share electrons from their outer shell.

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3
Q

Why do atoms share electrons?

A

To complete their outer shells (sharing means the electrons are in both outer shells and therefore count for both atoms

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4
Q

What is an appropriate way of modelling covalent bonds?

A

Using dot and cross diagrams (like Venn Diagrams)

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5
Q

In which particle do atoms share electrons and form covalent bonds?

A

Simple molecules

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6
Q

What is a molecule?

A

A molecule is a particle in which non-metals are joined together by covalent bonds

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7
Q

What is a simple molecule?

A

A molecule that only contains a few atoms.

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8
Q

What do covalent bonds need?

A

Electrostatic forces of attraction

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9
Q

Where are the forces for covalent bonds?

A

Between the nucleus of each bonded atom and the shared electron

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10
Q

How strong are the intermolecular forces between the simple molecules?

A

Weak

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11
Q

How strong are the covalent bonds between atoms in a simple molecule?

A

Strong

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12
Q

Where do the shared electrons go in a dot-and-cross diagram?

A

In the space where the 2 circles overlap

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