The Periodic Table was developed by Dmitri Mendeleev - Junior Cycle Science - Question 15 - 2019
Question 15
The Periodic Table was developed by Dmitri Mendeleev. It was published 150 years ago in 1869. To celebrate the International Year of the Periodic Table, The European... show full transcript
Worked Solution & Example Answer:The Periodic Table was developed by Dmitri Mendeleev - Junior Cycle Science - Question 15 - 2019
Step 1
Identify a gas which is a component of the Earth’s atmosphere and which is in plentiful supply.
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Answer
The gas identified from the table is Nitrogen (N), which is a component of the Earth’s atmosphere and is in plentiful supply.
Step 2
Why should the use of the gas helium (He) in birthday balloons be avoided?
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Answer
The use of helium in birthday balloons should be avoided because it is a non-renewable resource that is seriously threatened in the next 100 years due to its limited availability and the increasing demand for uses in various technologies.
Step 3
Suggest one way humans could contribute to sustaining levels of indium for future generations.
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Humans could contribute to sustaining levels of indium by recycling and upgrading electronic devices less frequently, repairing them instead or selling old phones to reduce the consumption of indium.
Step 4
Which of these elements is a solid at room temperature? Justify your answer.
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Answer
The element that is a solid at room temperature is Aluminium (Al). This is evident because the particles of aluminium are packed closely together, indicating a solid state.
Step 5
Predict the ratio of aluminium to chlorine in the compound aluminium chloride and write the chemical formula.
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In aluminium chloride, the ratio of aluminium to chlorine is 1:3. Therefore, the chemical formula for aluminium chloride is AlCl₃.
Step 6
Which element (1, 2, or 3) is most likely to be a metal? Justify your answer.
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Answer
Element 1 is most likely to be a metal because it has a high melting point (1538 °C) and boiling point (2862 °C), and it is stated to be a conductor of electricity, which are typical properties of metals.
Step 7
Which element (1, 2, or 3) is a liquid at room temperature (20 °C)? Justify your answer.
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Element 2 is a liquid at room temperature (20 °C) as it has a melting point of -7 °C, indicating that it remains in a liquid state at this temperature.
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