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A student bubbles ethene gas into bromine water - OCR Gateway - GCSE Chemistry - Question 8 - 2019 - Paper 2
Question 8
A student bubbles ethene gas into bromine water. What is observed? A Colour change from blue to colourless B Colour change from colourless to orange C Colour change ... show full transcript
Worked Solution & Example Answer:A student bubbles ethene gas into bromine water - OCR Gateway - GCSE Chemistry - Question 8 - 2019 - Paper 2
Step 1
Colour change from colourless to orange
Answer
When ethene gas is bubbled into bromine water, the bromine, which is initially orange, reacts with the ethene, leading to a decolorization of the bromine. This indicates the formation of a colorless compound as the alkene (ethene) reacts and adds across the double bond. Thus, the observed color change is from colourless to orange.