Elements, Compounds & Mixtures
1. This question has 3 part(s).
1.1. This question is about chromatography.
Two students carry out separate chromatography experiments to find the Rf values for five different food dyes, A, B, C, D and E.
State two things that should be the same in both experiments so that the students can compare their results fairly.
1.2. After doing the experiments the students calculate the Rf value for each food dye.
The table shows their results.
Dye | Student 1 Rf value | Student 2 Rf value |
A | 0.45 | 0.45 |
B | 0.63 | 0.64 |
C | 0.00 | 0.00 |
D | 0.83 | 1.20 |
E | 0.30 | 0.30 |
i) State what can be concluded about dye C.
(1)
ii) Explain which Rf value cannot be correct.
(2)
1.3. The diagram shows a chromatogram for a different food dye.
Some distances are shown on the diagram.
Calculate the Rf value for this food dye.
Give your answer to two significant figures.
Ai এর মাধ্যমে
১০ লক্ষ+ প্রশ্ন ডাটাবেজ
প্র্যাকটিস এর মাধ্যমে নিজেকে তৈরি করে ফেলো
উত্তর দিবে তোমার বই থেকে ও তোমার মত করে।
সারা দেশের শিক্ষার্থীদের মধ্যে নিজের অবস্থান যাচাই
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