3. (a) Give one difference between Mendeleev’s periodic table of the elements and the modern periodic table - Leaving Cert Chemistry - Question 3 - 2018
Question 3
3. (a) Give one difference between Mendeleev’s periodic table of the elements and the modern periodic table.
(b) Give the symbol of a metallic element used as a cat... show full transcript
Worked Solution & Example Answer:3. (a) Give one difference between Mendeleev’s periodic table of the elements and the modern periodic table - Leaving Cert Chemistry - Question 3 - 2018
Step 1
Give one difference between Mendeleev’s periodic table of the elements and the modern periodic table.
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Answer
Mendeleev's periodic table was arranged based on increasing atomic mass, while the modern periodic table is organized by increasing atomic number.
Step 2
Give the symbol of a metallic element used as a catalyst in the catalytic converter of a car.
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Answer
The symbol of a metallic element commonly used as a catalyst in catalytic converters is Pt, which stands for platinum.
Step 3
Identify gas X and gas Y.
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Answer
Gas X is hydrogen (H₂) and gas Y is oxygen (O₂).
Step 4
Write a balanced equation for the reaction that occurs when hydrogen gas reacts with chlorine gas producing hydrogen chloride.
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Answer
The balanced equation for the reaction is:
ightarrow 2HCl(g)$$
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