Purity & Separating Mixtures
1. This question has 3 part(s).
1.1. A student is separating some mixtures. She wants to make pure water from a solution of salt water. She filters the mixture.
Her method does not work.
Explain why her method does not work and describe the method she should use.
1.2. The student wants to separate a mixture of two liquids.
The liquids are:
Liquid | Boiling point (°C) |
Water | 100 |
Ethanol | 78 |
Which separation technique should she use?
Explain how the method works.
1.3. The student separates two solid substances A and B. She wants to check that they are pure.
i) What is meant by a pure solid?
[1]
ii) The student measures the melting points of four samples of solid A.
Look at her results.
Sample | Melting point (°C) |
1 | 115 |
2 | 119 |
3 | 114 – 118 |
4 | 120 – 122 |
She knows that a pure sample of solid A has a melting point of 120 °C.
She concludes that sample 4 is the purest sample of solid A.
Do the results support her conclusion? Explain your answer using evidence from the table.
[3]
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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