This question is about the Group 1 metals. (a) A teacher adds a small piece of a Group 1 metal to a trough of water, as shown in Fig. 12.1. Which Group 1 metal did the teacher add to the water in Fig. 12.1? Put a tick around the correct answer. lithium sodium potassium rubidium caesium (b) Sodium is a soft metal with a dull coating. It is shiny when it is freshly cut. After several seconds, the shiny surface goes dull. (i) Which gas in the air reacts with the sodium as it goes dull? (ii) What is the name of the chemical compound made as the sodium goes dull? (iii) How long would it take a piece of freshly cut lithium to go dull compared to sodium? Give a reason for your answer. (c) Fig. 12.2 shows the trend in the density of the Group 1 metals from lithium to caesium. Which Group 1 metal does not fit the general trend? Give a reason for your answer using information from Fig. 12.2.

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This question is about the Group 1 metals - OCR Gateway - GCSE Chemistry: Combined Science - Question 12 - 2021 - Paper 1

Question 12

This question is about the Group 1 metals. (a) A teacher adds a small piece of a Group 1 metal to a trough of water, as shown in Fig. 12.1. Which Group 1 metal did ... show full transcript

Worked Solution & Example Answer:This question is about the Group 1 metals - OCR Gateway - GCSE Chemistry: Combined Science - Question 12 - 2021 - Paper 1

Step 1

Which Group 1 metal did the teacher add to the water in Fig. 12.1?

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Answer

The teacher added sodium to the water in Fig. 12.1. Sodium reacts vigorously with water, producing a lilac flame and sparks.

Step 2

Which gas in the air reacts with the sodium as it goes dull?

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Answer

The gas in the air that reacts with sodium as it goes dull is oxygen.

Step 3

What is the name of the chemical compound made as the sodium goes dull?

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Answer

The chemical compound formed as sodium goes dull is sodium oxide (Na2O).

Step 4

How long would it take a piece of freshly cut lithium to go dull compared to sodium? Give a reason for your answer.

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Answer

It would take a longer time for freshly cut lithium to go dull compared to sodium. This is because lithium reacts with oxygen less vigorously than sodium, resulting in a slower formation of the oxide layer.

Step 5

Which Group 1 metal does not fit the general trend? Give a reason for your answer using information from Fig. 12.2.

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Answer

Lithium does not fit the general trend in density among the Group 1 metals. In Fig. 12.2, lithium's density is lower than that of sodium, contrary to the expectation that density increases down the group.

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