Gases in the atmosphere
1. This question has 3 part(s).
1.1. A teacher uses the reaction between phosphorus and oxygen to calculate the percentage of oxygen in air. She uses this apparatus and excess phosphorus.
The volume of gas in the tube decreases as the phosphorus reacts with oxygen. The teacher measures the volume of gas in the tube at one-minute intervals. The table shows the teacher’s results.
Time in minutes | Volume of gas in tube in cm3 |
0 | 48.5 |
1 | 41.0 |
2 | 38.0 |
4 | 37.5 |
5 | 37.0 |
6 | 37.0 |
7 | 37.0 |
State how the results show that all the oxygen has reacted.
1.2. Give one change to this experiment that would make the results more accurate.
1.3. Use the results to calculate the percentage of oxygen in air. Give your answer to one decimal place.
percentage = ...........................%
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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