Bonding structures Flashcards

1
Q

What is a molecule?

A

2 or more (non-metal ) atoms held together by covalent bonds

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2
Q

What is meant by a diatomic molecule?

( L.O. 20)

A

A molecule made up of 2 atoms

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3
Q

What are the 7 elements that exist as diatomic molecules?

( L.O. 20)

A
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4
Q

What is a covalent bond?

( L.O.17)

A

A shared pair of electrons

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5
Q

Why do elements take part in reactions?

( L.O.19)

A

To achieve a full outer shell and achieve a noble gas electron arrangement.

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6
Q

What type of elements form covalent bonds?

( LO : 18 )

A

Non - metal elements

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7
Q

What holds the atoms together when they form covalent bonds?

( LO : 17 )

A

The common (electrostatic) attraction the nuclei have for the shared pair of electrons.

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8
Q

How do non-metal atoms achieve a full outer shell when they react with one another?

( L.O.19)

A

They share unpaired electrons

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9
Q

What 4 shapes of molecules must we know?

( L.O 21)

A
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10
Q

What are the properties of covalent molecular substances?

( L.O. 24)

A
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11
Q

Why do covalent molecular substances have low melting and boiling points?

( L.O. 24)

A
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12
Q

Are covalent molecular substances soluble in any other liquids?

( LO 25 )

A

Yes. Hexane for example

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13
Q

What are the properties of covalent network substances?

( LO 26 )

A
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14
Q

Why do covalent network substances have high melting and boiling points?

( LO 26 )

A
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15
Q

Why do covalent network substances NOT conduct electricity?

A

Because the charged particles ( electrons) are NOT free to move.

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16
Q

What is an ion?

A

An atom that has lost or gained electrons

17
Q

Why do atoms form ions?

A

To obtain a full ( stable) outer shell

18
Q

How does an ionic bond form?

A

An electrostatic attraction forms between oppositely charged ions

19
Q

What name do we give to the structure an ionic solid takes?

A
20
Q

Do ionic compounds have high or low melting and boiling points?

A
21
Q

Why are many ionic compounds soluble in water?

A

The attractions that polar water molecules have for ions tears the lattice apart

22
Q

Do ionic compounds conduct electricity?

A

Solid: No

Liquid: Yes

Solution : Yes