4 (a) (i) Balance the equation for the reaction between sodium and chlorine to produce sodium chloride by putting numbers in the spaces provided - Edexcel - GCSE Chemistry - Question 4 - 2014 - Paper 1
Question 4
4 (a) (i) Balance the equation for the reaction between sodium and chlorine to produce sodium chloride by putting numbers in the spaces provided.
Na + Cl →
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Worked Solution & Example Answer:4 (a) (i) Balance the equation for the reaction between sodium and chlorine to produce sodium chloride by putting numbers in the spaces provided - Edexcel - GCSE Chemistry - Question 4 - 2014 - Paper 1
Step 1
Balance the equation for the reaction between sodium and chlorine to produce sodium chloride.
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Answer
To balance the equation:
ightarrow 2 ext{NaCl}$$
Step 2
Calculate the percentage yield of sodium chloride in this experiment.
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Complete the sentence: These properties show that the structure of sodium chloride is.
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Answer
The correct answer is:
A ionic
Step 4
Calculate the relative formula mass of sodium chloride, NaCl.
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Answer
To calculate the relative formula mass of NaCl:
extRelativeFormulaMass=extNa+extCl=23+35.5=58.5
Step 5
Calculate the percentage by mass of magnesium in magnesium sulfate, MgSO₄.
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Answer
First, determine the mass of magnesium in MgSO₄:
Magnesium (Mg) = 24
Formula mass of MgSO₄ = 120
Percentage by mass of magnesium is calculated as:
ext{Percentage of Magnesium} = rac{24}{120} imes 100 = 20\%
Step 6
Give the empirical formula of ethane.
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Answer
The empirical formula of ethane, C₂H₆, is:
extEmpiricalFormula=extCH3
Step 7
Explain why ethane has a low boiling point.
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Answer
Ethane has a low boiling point because it is a simple molecular, covalent compound. The forces holding the molecules together are weak van der Waals forces, which require little energy to overcome. Therefore, less heat is needed to separate the molecules.
