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A2 Chemistry > Period 3 > Flashcards

Period 3 Flashcards

- Reactions of Period 3 elements. - The oxides of elements in Period 3. - The acidic/basic nature of the Period 3 oxides. - Practice questions.

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1
Q

What are the elements in Period 3?

A

Na, Mg, Al, Si, P, S, Cl and Ar.

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2
Q

From left to right across the period…

A

you go from metals to non-metals.

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3
Q

Is Si a metal or non-metal?

A

It is a semi-metal and therefore can conduct small amounts of electricity.

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4
Q

Argon is a noble gas. True or false?

A

True!

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5
Q

What type of reaction do all Period 3 elements undergo?

A

Redox reactions. This is because the elements always start with an oxidation state of 0.

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6
Q

How does sodium react with water?

A

Vigorously.

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7
Q

How does magnesium react with water?

A

Slowly.

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8
Q

How does magnesium react with steam?

A

Vigorously.

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9
Q

What is the oxidation state of an element?

A

0.

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10
Q

The sum of the oxidation states should be…

A

The same on either side of the equation.

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11
Q

How do metals react with oxygen?

A

They burn vigorously to form basic oxides.

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12
Q

How do non-metals react with oxygen?

A

They burn to form acidic oxides.

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13
Q

Is silicon dioxide soluble or insoluble?

A

Insoluble.

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14
Q

How do you react sodium, Na, with oxygen?

A

Place hot sodium in a gas jar of oxygen.

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15
Q

How do you react magnesium, Mg, with oxygen?

A

Place burning magnesium ribbon in a gas jar of oxygen.

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16
Q

How do you react aluminium, Al, with oxygen?

A

Sprinkle aluminium powder into a Bunsen flame.

17
Q

Why does aluminium appear unreactive to air or water?

A

It is coated with a thin but tough layer of oxide which protects it. Once scratched, the aluminium is so reactive that a new layer of oxide forms immediately.

18
Q

What is an allotrope?

A

The term allotrope refers to one or more forms of a chemical element that occur in the same physical state. For example: graphite and diamond are allotropes of carbon.

19
Q

How many allotropes does phosphorus have?

A

Two - one red, one white. (White phosphorus will spontaneously ignite in air).

20
Q

What colour are metal oxides?

A

They are white as the metals have no part-filled d-orbitals (see the topic “Coloured Ions”).

A2 Chemistry (1 decks)

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