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4 (a) Air contains several gaseous elements - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2020 - Paper 1
Question 4
4 (a) Air contains several gaseous elements. Which of these shows the three most common gaseous elements in air, listed in order from the most common to the least c... show full transcript
Worked Solution & Example Answer:4 (a) Air contains several gaseous elements - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2020 - Paper 1
Step 1
Step 2
Use the results to calculate the density of argon in g cm⁻³.
Answer
To find the density of argon, we use the formula:
density = \frac{mass}{volume}\n$$ The mass of argon can be calculated by subtracting the mass of the stopper and flask from the mass of the stopper and flask full of argon:mass_{argon} = 79.120 , g - 78.639 , g = 0.481 , g\n$$
Now, we can calculate the density:
density_{argon} = \frac{0.481 \, g}{250.0 \, cm³} = 0.001924 \, g/cm³\n$$ Thus, the density of argon is 0.00192 g cm⁻³.Step 3
Step 4
Explain, using the data in Figure 4, which gas mixture represents the early atmosphere.
Answer
The results in Figure 4 indicate that gas mixture P caused a bubble to form in limewater that remained for an extended period, which suggests the presence of carbon dioxide. On the other hand, gas mixture Q caused no significant reaction. Therefore, gas mixture P is representative of the early atmosphere due to the presence of carbon dioxide from the volcanic activity, while gas mixture Q represents the current atmosphere.