The following words or phrases are omitted from the passage below - Leaving Cert Chemistry - Question 7 - 2017
Question 7
The following words or phrases are omitted from the passage below.
ionic
negatively-charged
electrons
crystal lattice
positively-charged
molecules
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Worked Solution & Example Answer:The following words or phrases are omitted from the passage below - Leaving Cert Chemistry - Question 7 - 2017
Step 1
1. Fill in the omitted word/phrase for 1.
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Answer
electrons
Step 2
2. Fill in the omitted word/phrase for 2.
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Answer
positively-charged
Step 3
3. Fill in the omitted word/phrase for 3.
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Answer
negatively-charged
Step 4
4. Fill in the omitted word/phrase for 4.
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Answer
ionic
Step 5
5. Fill in the omitted word/phrase for 5.
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Answer
molecules
Step 6
6. Fill in the omitted word/phrase for 6.
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Answer
crystal lattice
Step 7
Describe the procedure for carrying out a flame test on a salt.
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Answer
To conduct a flame test, first, clean a platinum (nichrome) wire by dipping it in concentrated hydrochloric acid (HCl). Next, take a small sample of the salt and rub it onto the wire. Then hold the wire in the hottest part of a Bunsen flame and observe the colour of the flame. This test allows us to identify the presence of specific metal ions based on the flame colour produced.
Step 8
What colour would a sodium salt give to a fireworks display?
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Answer
yellow (amber)
Step 9
Name a salt of sodium that would give this result.
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Answer
sodium chloride / NaCl
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