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Name Group 7 of the Periodic Table.
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Name Group 7 of the Periodic Table.
Group 7 of the Periodic Table is the called the halogens.
Explain why fluorine is in Group 7 of the Periodic Table.
Fluorine is in Group 7 of the Periodic Table because it has 7 electrons in its outer shell.
Give the colour and state of chlorine at room temperature.
The colour and state of chlorine at room temperature is a pale green gas.
Describe what happens to the melting points of the halogens going down the group.
Going down the group, melting points of the halogens increases.
What is meant by a halogen displacement reaction?
A halogen displacement reaction is one where a more reactive halogen displaces a less reactive halogen from an aqueous solution of its halide.
Write the word equation for the displacement reaction between potassium bromide and chorine.
The word equation for the displacement reaction between potassium bromide and chlorine is:
potassium bromide + chlorine → potassium chloride + bromine
Write the balanced symbol equation for the reaction between potassium iodide and bromine.
The balanced symbol equation for the reaction between potassium iodide and bromine is:
Br2 + 2KI → 2KBr + I2
Explain why iodine cannot displace chlorine from potassium chloride.
Iodine cannot displace chlorine from potassium chloride because iodine is less reactive than chlorine.
Explain why chlorine has a higher melting point than fluorine.
Chlorine has a higher melting point than fluorine because there are stronger intermolecular forces which need more energy to overcome.
Give the charge of the ions formed when halogens react with Group 1 metals.
The charge of the ions formed when halogens react with Group 1 metals is 1-.
Define the term reactivity.
Reactivity is the tendency of a substance to undergo a chemical reaction by losing or gaining electrons.
What are halide ions?
Halide ions are ions formed when halogen atoms gain an electron, carrying a 1- charge
Describe the trend in reactivity of the halogens going down the group.
The trend in reactivity of the halogens is, going down the halogen, reactivity decreases.
Give the electronic configuration of a a chlorine atom.
The electronic configuration of a chlorine atom is 2.8.7.
Why is fluorine the most reactive halogen?
Fluorine is the most reactive halogen because it has the fewest shells so it is easier for the nucleus to attract an electron.
True or False?
It becomes easier for halogen atoms to gain electrons as you go down the group.
False.
It becomes harder for halogen atoms to gain electrons as you go down the group making them less reactive.
Explain why reactivity decreases going down Group 7.
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.