Group 7 – Halogens (Edexcel GCSE Chemistry): Flashcards
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What are the states of halogens at room temperature?
What are the states of halogens at room temperature?
Fluorine and chlorine are gases; bromine is liquid; iodine is solid.
How do halogens react with metals?
How do halogens react with metals?
They form ionic compounds by gaining electrons.
What color is chlorine gas?
What color is chlorine gas?
Chlorine gas is greenish-yellow in color.
What is the trend in boiling points of halogens?
What is the trend in boiling points of halogens?
Boiling points increase down the group due to larger molecules.
How does reactivity change in halogens?
How does reactivity change in halogens?
Reactivity decreases down the group; fluorine is most reactive.
What is formed when halogens react with hydrogen?
What is formed when halogens react with hydrogen?
They form hydrogen halides, like HCl and HBr.
What color does iodine turn in starch solution?
What color does iodine turn in starch solution?
Iodine turns blue-black in starch solution.
What role do halogens play in water disinfection?
What role do halogens play in water disinfection?
Chlorine is commonly used to disinfect drinking water.
What is a use of bromine in industry?
What is a use of bromine in industry?
Bromine is used in flame retardants and certain pesticides.
How do halogens behave in displacement reactions?
How do halogens behave in displacement reactions?
More reactive halogens can displace less reactive ones.