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AQA GCSE · Question 04.1 · Bonding structure and the properties of matter
This question is about alloys. Solders are alloys of tin and lead. The solder in Figure 4 has 6 lead atoms for every 24 tin atoms. Determine the percentage of atoms that are lead atoms in the solder in Figure 4.
This question is about alloys. Solders are alloys of tin and lead. The solder in Figure 4 has 6 lead atoms for every 24 tin atoms. Determine the percentage of atoms that are lead atoms in the solder in Figure 4.
How to approach this question
1. Calculate the total number of atoms by adding the number of lead atoms and tin atoms.\n2. Use the formula for percentage: Percentage = (Part / Whole) × 100.\n3. In this case, the "Part" is the number of lead atoms, and the "Whole" is the total number of atoms.\n4. Substitute the numbers into the formula and calculate the result.
Full Answer
Total number of atoms = number of lead atoms + number of tin atoms\nTotal number of atoms = 6 + 24 = 30\n\nPercentage of lead atoms = (number of lead atoms / total number of atoms) × 100\nPercentage of lead atoms = (6 / 30) × 100\nPercentage of lead atoms = 20%
To calculate the percentage of lead atoms, we need to know the number of lead atoms and the total number of atoms.\n\nNumber of lead atoms = 6\nNumber of tin atoms = 24\n\nTotal number of atoms = 6 + 24 = 30\n\nNow, we can calculate the percentage:\nPercentage of lead atoms = (Number of lead atoms / Total number of atoms) × 100\nPercentage of lead atoms = (6 / 30) × 100\nPercentage of lead atoms = 0.2 × 100 = 20%
Common mistakes
✗ Calculating the percentage of tin atoms instead of lead atoms.\n✗ Dividing the number of lead atoms by the number of tin atoms (6 / 24).\n✗ Calculation errors.
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