AQA GCSE · Question 04.4 · Bonding structure and the properties of matter
What is the melting point of pure tin? Use Figure 5.
How to approach this question
1. Locate "pure tin" on the x-axis. Pure tin corresponds to 100% tin.\n2. Find 100 on the x-axis.\n3. Follow the vertical line up from 100 until you reach the data line.\n4. From that point on the data line, follow the horizontal line across to the y-axis.\n5. Read the value on the y-axis. Each small square on the y-axis represents 2°C.
Full Answer
To find the melting point of pure tin, we need to look at the point on the graph where the percentage by mass of tin is 100%. \n1. Find 100 on the x-axis.\n2. Go up to the line graph.\n3. Read across to the y-axis. The value is one small square above 230. Since each major grid line is 20°C and there are 10 small squares, each small square is 2°C. Therefore, the melting point is 232°C.
Common mistakes
✗ Reading the value for 0% tin (pure lead) instead of 100% tin.\n✗ Misreading the scale on the y-axis.
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