This question is about elements in group 1 of the periodic table - Edexcel - GCSE Chemistry Combined Science - Question 1 - 2022 - Paper 1
Question 1
This question is about elements in group 1 of the periodic table.
(a) Figure 1 shows the symbols of the first three elements in group 1 of the periodic table and th... show full transcript
Worked Solution & Example Answer:This question is about elements in group 1 of the periodic table - Edexcel - GCSE Chemistry Combined Science - Question 1 - 2022 - Paper 1
Step 1
Give the symbol of another element in group 1.
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Answer
One possible answer is Rb (Rubidium).
Step 2
Give the atomic number of lithium.
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Answer
The atomic number of lithium (Li) is 3.
Step 3
Describe the trend in the melting points of the elements in Figure 1.
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Answer
The melting points of the elements in Figure 1 decrease as you go down the group. Lithium has the highest melting point at 181 °C, sodium has a melting point of 98 °C, and potassium has the lowest melting point at 64 °C. This trend can be attributed to the increasing atomic size and decreasing metallic bonding strength down the group.
Step 4
Give the name of the container shown in Figure 2.
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Answer
The container shown in Figure 2 is a test tube.
Step 5
step 2: change and explanation
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Answer
Change: Cut a smaller piece of sodium.
Explanation: A smaller piece of sodium will reduce the reaction's vigor because it will react with water more slowly, minimizing the danger of an excessive reaction.
Step 6
step 3: change and explanation
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Answer
Change: Use a larger container with water.
Explanation: A larger container or trough will ensure that any reaction products have a greater distance to disperse, thus reducing the risk of any violent reactions or splattering.
