Group 7 (periodic table) Flashcards

1
Q

Name Group 7 of the Periodic Table.

A

Group 7 of the Periodic Table is the called the halogens.

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2
Q

Explain why fluorine is in Group 7 of the Periodic Table.

A

Fluorine is in Group 7 of the Periodic Table because it has 7 electrons in its outer shell.

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3
Q

Give the colour and state of chlorine at room temperature.

A

The colour and state of chlorine at room temperature is a green gas.

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4
Q

Describe what happens to the melting points of the halogens going down the group.

A

Going down the group, melting points of the halogens decreases.

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5
Q

Write the word equation for the displacement reaction between potassium bromide and chorine.

A

The word equation for the displacement reaction between potassium bromide and chlorine is:

potassium bromide + chlorine → potassium chloride + bromine

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5
Q

What is meant by a halogen displacement reaction?

A

A halogen displacement reaction is one where a more reactive halogen displaces a less reactive halogen from an aqueous solution of its halide.

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6
Q

Write the balanced symbol equation for the reaction between potassium iodide and bromine.

A

The balanced symbol equation for the reaction between potassium iodide and bromine is:

Br2 + 2KI → 2KBr + I2

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7
Q

Explain why iodine cannot displace chlorine from potassium chloride.

A

Iodine cannot displace chlorine from potassium chloride because iodine is less reactive than chlorine.

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8
Q

Give the charge of the ions formed when halogens react with Group 1 metals.

A

The charge of the ions formed when halogens react with Group 1 metals is 1-.

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8
Q

Explain why chlorine has a higher melting point than fluorine.

A

Chlorine has a higher melting point than fluorine because there are stronger intermolecular forces which need more energy to overcome.

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9
Q

Define the term reactivity.

A

Reactivity is the tendency of a substance to undergo a chemical reaction by losing or gaining electrons.

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9
Q

Describe the trend in reactivity of the halogens going down the group.

A

The trend in reactivity of the halogens is, going down the halogen, reactivity decreases.

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10
Q

What are halide ions?

A

Halide ions are ions formed when halogen atoms gain an electron, carrying a 1- charge

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11
Q

Give the electronic configuration of a a chlorine atom.

A

The electronic configuration of a chlorine atom is 2.8.7.

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12
Q

Why is fluorine the most reactive halogen?

A

Fluorine is the most reactive halogen because it has the fewest shells so it is easier for the nucleus to attract an electron.

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13
Q

True or False?

It becomes easier for halogen atoms to gain electrons as you go down the group.

A

False.

It becomes harder for halogen atoms to gain electrons as you go down the group making them less reactive.

14
Q

Explain why reactivity decreases going down Group 7.

A

Reactivity decreases going down Group 7 because the atoms have more shells, meaning there is a less attraction between an incoming electron and the positive nucleus making it harder to gain an electron.