This question is about elements in the Periodic Table - OCR Gateway - GCSE Chemistry - Question 16 - 2020 - Paper 1
Question 16
This question is about elements in the Periodic Table.
Look at the table. It shows some properties of Group 7 elements.
Element Molecular formula State at room t... show full transcript
Worked Solution & Example Answer:This question is about elements in the Periodic Table - OCR Gateway - GCSE Chemistry - Question 16 - 2020 - Paper 1
Step 1
Complete the table. Use ideas about trends down a Group to help you.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Fluorine - gas
Astatine - Radius in the range 0.148 - 0.210 nm
Iodine - sodium bromide
Step 2
Complete the word equation.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
bromine + sodium iodide → sodium bromide + iodine
Step 3
There is no reaction between iodine and sodium bromide. Explain why.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The reason there is no reaction is that iodine is less reactive than bromine. In a displacement reaction, a more reactive halogen displaces a less reactive one. Since iodine cannot displace bromine from sodium bromide, no reaction occurs.
Step 4
Write the balanced symbol equation for this reaction.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
