Question
Answer the following:
a) Vinegar is mixed with baking soda. Can you get vinegar and the bicarbonate back from the resultant mixture? Is it a chemical or a physical change?
b) How can we confirm the release of carbon dioxide? [3 MARKS]
Answer: Option A
:
a) Type of change: 1 Mark
Irreversible change: 1 Mark
b) Answer: 1 Mark
When vinegar is mixed with baking soda, the release of carbon dioxide gas is seen in the form of bubbles.
We cannot get back our original substances since it is an irreversible change.
It is a chemical change because a new substance (carbon dioxide) is formed.
b) When carbon dioxide is passed through lime water, calcium carbonate is formed, which makes the lime water milky. The turning of lime water milky is a standard test for carbon dioxide.
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:
a) Type of change: 1 Mark
Irreversible change: 1 Mark
b) Answer: 1 Mark
When vinegar is mixed with baking soda, the release of carbon dioxide gas is seen in the form of bubbles.
We cannot get back our original substances since it is an irreversible change.
It is a chemical change because a new substance (carbon dioxide) is formed.
b) When carbon dioxide is passed through lime water, calcium carbonate is formed, which makes the lime water milky. The turning of lime water milky is a standard test for carbon dioxide.
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