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Calcium nitrate solution reacts with sodium carbonate solution - Edexcel - GCSE Chemistry - Question 4 - 2013 - Paper 1

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Calcium nitrate solution reacts with sodium carbonate solution. The products are calcium carbonate and another salt. Write the word equation for this reaction. (b)... show full transcript

Worked Solution & Example Answer:Calcium nitrate solution reacts with sodium carbonate solution - Edexcel - GCSE Chemistry - Question 4 - 2013 - Paper 1

Step 1

Write the word equation for this reaction.

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Answer

Sodium carbonate + Calcium nitrate → Sodium nitrate + Calcium carbonate.

Step 2

Complete the sentence by putting a cross (X) in the box next to your answer.

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Answer

C orange-red

Step 3

Describe how a flame test is carried out on a solid.

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Answer

  1. Clean the wire of the flame test with hydrochloric acid to avoid contamination.

  2. Sample a small amount of the solid and place it on the wire.

  3. Hold the wire in the flame of a Bunsen burner to observe the color produced.

Step 4

Calculate the percentage yield of carbon dioxide in this reaction.

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Answer

The theoretical yield of carbon dioxide is 44 g. The actual yield is 40 g. Therefore, the percentage yield is calculated as follows:

ext{Percentage Yield} = rac{ ext{Actual Yield}}{ ext{Theoretical Yield}} imes 100 = rac{40}{44} imes 100 ext{ = } 90.9 ext{ %}

Step 5

Suggest a reason why only 40 g of carbon dioxide was formed in the experiment.

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Answer

The reaction may be incomplete, or not all carbon dioxide was collected during the experiment. Another possibility is that the sample used may have been impure.

Step 6

Complete the sentence by putting a cross (X) in the box next to your answer.

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Answer

D have high melting points

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