GCSE Edexcel Chemistry Combined Science Extracting metals using carbon: Which of the following substance

Which of the following substances will be a solid at 20 °C and will melt when placed in a beaker of hot water at 80 °C? | | melting point in °C | boiling point in °C | |----|---------------------|---------------------| | A | 122 | 249 | | B | -7 | 59 | | C | 30 | 2403 | | D | -32 | 27 | A student set up the apparatus shown in Figure 2 to obtain pure water from sea water by distillation - Edexcel - GCSE Chemistry Combined Science - Question 3 - 2018 - Paper 1

Question 3

Which-of-the-following-substances-will-be-a-solid-at-20-°C-and-will-melt-when-placed-in-a-beaker-of-hot-water-at-80-°C?--|----|-melting-point-in-°C-|-boiling-point-in-°C-|-|----|---------------------|---------------------|-|-A--|-122-----------------|-249-----------------|-|-B--|--7------------------|-59------------------|-|-C--|-30------------------|-2403----------------|-|-D--|--32-----------------|-27------------------|--A-student-set-up-the-apparatus-shown-in-Figure-2-to-obtain-pure-water-from-sea-water-by-distillation-Edexcel-GCSE Chemistry Combined Science-Question 3-2018-Paper 1.png

Which of the following substances will be a solid at 20 °C and will melt when placed in a beaker of hot water at 80 °C? | | melting point in °C | boiling point i... show full transcript

Worked Solution & Example Answer:Which of the following substances will be a solid at 20 °C and will melt when placed in a beaker of hot water at 80 °C? | | melting point in °C | boiling point in °C | |----|---------------------|---------------------| | A | 122 | 249 | | B | -7 | 59 | | C | 30 | 2403 | | D | -32 | 27 | A student set up the apparatus shown in Figure 2 to obtain pure water from sea water by distillation - Edexcel - GCSE Chemistry Combined Science - Question 3 - 2018 - Paper 1

Step 1

Which of the following substances will be a solid at 20 °C and will melt when placed in a beaker of hot water at 80 °C?

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Answer

To determine which substance is solid at 20 °C and melts at 80 °C, we examine the melting points:

A: Melting point 122 °C (solid at 20 °C, does not melt at 80 °C)
B: Melting point -7 °C (liquid at 20 °C)
C: Melting point 30 °C (solid at 20 °C and will melt at 80 °C)
D: Melting point -32 °C (liquid at 20 °C)

The only correct answer is C, 30°C.

Step 2

Explain how the water in sea water separates to produce the pure water in this apparatus.

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Answer

The process of obtaining pure water from sea water using the apparatus in Figure 2 involves the following steps:

Boiling/evaporating: The sea water is heated, causing it to boil and form steam. This steam carries away salts and impurities, which remain in the original container.
Condensation: As the steam rises, it travels through the apparatus and cools down, condensing back into liquid water. This pure water is collected separately as it forms.

In summary, the separation process utilizes the properties of evaporation and condensation to isolate pure water from sea water.

Which of the following substances will be a solid at 20 °C and will melt when placed in a beaker of hot water at 80 °C?

Explain how the water in sea water separates to produce the pure water in this apparatus.

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