Group 7 Flashcards
(15 cards)
Chlorine reacts with potassium bromide in solution to form bromine and potassium chloride
State what colour the mixture is at the end of the reaction
- Orange
Solid chloride is dark red
which is the most likely position of the element x in the table
C
Complete the balanced equation for the reaction between hydrogen and bromine
2HBr
The structure of a metal is a lattice of
C - cations in a sea of electrons
To join 2 pieces of metal by welding they must be melted together
- metals have a high melting point
Pieces of metals are welded together in an atmosphere of argon
Explain why an atmosphere of argon is used
- argon is inert and will not react
Iron reacts with bromine to form iron lll bromide
write the balance equation for this reaction
2Fe + 3Br2 —> 2FeBr3
At room temperature iodine is ?
C - a grey solid
Use the information in the table to explain the order of reactivity of the 3halogens
Order of reactivity is chlorine, bromine, iodine (CBI)
chlorine displaces bromine (from bromide) and chlorine displaces iodine (iodide)
Predict the appearance of astatine.
black solid crystals
Chlorine, bromine and iodine carry out displacement reactions
explain how displacement reaction can be used to show the reactivity of these three elements (6)
order of reactivity: chlorine, bromine, iodine
- add chlorine to potassium bromide
- solution turns orange
- chlorine displaces bromine
- add bromine to potassium iodide
- solution turns yellow
- bromine displaces iodine
- add chlorine to potassium iodide
- solution turns yellow
- chlorine displaces iodine
Explain the type of reaction bromine atoms undergo when they are converted to bromide ions
- bromine atoms are reduced
- because electrons are gained to form bromide ions
State a hazard associated with chlorine gas
- poisonous gas
Describe a test that can be used to identify a sample of gas as chlorine
- damp litmus paper bleached white
State a use of chlorine
- bleach
