A student carried out a series of experiments to investigate the properties of sucrose (table sugar) - Junior Cycle Science - Question 13 - 2022
Question 13
A student carried out a series of experiments to investigate the properties of sucrose (table sugar).
In the first experiment, the student investigated the melting ... show full transcript
Worked Solution & Example Answer:A student carried out a series of experiments to investigate the properties of sucrose (table sugar) - Junior Cycle Science - Question 13 - 2022
Step 1
What is meant by the melting point of a substance?
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Answer
The melting point of a substance is the temperature at which a solid changes to a liquid. At this specific temperature, the solid and liquid phases of the substance coexist in equilibrium.
Step 2
Is melting an example of a physical change or a chemical change? Explain your answer.
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Melting is an example of a physical change because no new substance is produced or formed during the melting process, and the change can be reversed when the liquid solidifies.
Step 3
The aluminium cube had a smaller mass than the zinc cube. Explain why.
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The aluminium cube had a smaller mass than the zinc cube due to its lower density. Aluminium is less dense than zinc, leading to a lower mass for the same volume of material.
Step 4
The sucrose on the aluminium melted before the sucrose on the zinc. What does this result tell us about the two metals? Put a tick (✓) in the correct box.
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Aluminium is a better conductor of heat than zinc. (✓)
Step 5
Explain why the sugar melted but the metals did not.
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Sugar has a lower melting point compared to metals. While the sugar melted, the metals (zinc and aluminium) have much higher melting points, so they remained solid when subjected to the heat.
Step 6
State two properties of non-metals.
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Non-metals are generally poor conductors of heat and electricity, serving as good insulators.
Non-metals typically have lower melting points and are often brittle at room temperature.
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