8 a i. All about water Flashcards

1
Q

What type of bonding exists in water?

A

Covalent molecular

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2
Q

What is the molecular formula of water?

A

H 2 O

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3
Q

What shape is the water molecule?

A

Angular or

Bent or

Non-linear

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4
Q

What is meant by a polar molecule?

A

A molecule which has a separation of charge within it.

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5
Q

Why is water a polar molecule?

A
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6
Q

What types of substances dissolve in water?

A
  • ionic compounds
    • polar molecules
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7
Q

What is an electrostatic attraction?

A

An attraction between 2 opposite (+ve and -ve) charges,

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8
Q

What is the attraction between water molecules?

A

An electrostatic attraction between the as shown by dashed line in diagram

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9
Q

How do some water molecules get ionised?

A

The electrostatic attraction between molecules can cause one to break into 2 ions

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10
Q

Why does water conduct if it is covalent molecular substance?

A

Because some water molecules break into ions which are free to move in solution.

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11
Q

Why is pure water a poor conductor?

A

Beacuse the concenmtration of ions in solution is always very small

Around 1 in 500 million are ionised at any one time

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12
Q

What are the 2 ions that water breaks into?

A
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13
Q

What is the alkaline ion?

A

Hydroxide (OH- (aq) ) ion

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14
Q

What is the acidic ion?

A

Hydrogen (H+ (aq) ) ion

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15
Q

Why does water have a pH of 7?

A

Because it ionises to produce equal numbers of H+ (aq) and OH- (aq) ions.

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