1. Sodium carbonate and copper chloride are both ionic solids - Edexcel - GCSE Chemistry - Question 1 - 2013 - Paper 1
Question 1
1. Sodium carbonate and copper chloride are both ionic solids.
They are both soluble in water.
(a) Which row of the table shows the most likely melting points of t... show full transcript
Worked Solution & Example Answer:1. Sodium carbonate and copper chloride are both ionic solids - Edexcel - GCSE Chemistry - Question 1 - 2013 - Paper 1
Step 1
Which row of the table shows the most likely melting points of these two salts?
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The correct row is C. This is because sodium carbonate has a high melting point of 851 °C, and copper chloride has a moderate melting point of 498 °C. Both values indicate that these salts are likely to have significant melting points compared to other options provided.
Step 2
Give the formula of copper chloride.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The formula of copper chloride is CuCl₂. This indicates that each formula unit contains one copper ion (Cu²⁺) and two chloride ions (Cl⁻).
Step 3
If a flame test is carried out on copper chloride, the colour in the flame is
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The flame test for copper(II) chloride produces a green-blue coloration, therefore, the correct answer is D.
