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LATEST 2023_2024 CHEMISTRY SUMMARY QUESTIONS WITH ANSWERS ALL IN ONE
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July 2023
2022/2023
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LATEST 2023_2024 CHEMISTRY SUMMARY QUESTIONS WITH ANSWERS ALL IN ONE
Example 7.1 Evidence of a Chemical Reaction
Which changes involve a chemical reaction? Explain your answers.
a. ice melting upon warming
b. an electric current passing through water, resulting in the formation of hydrogen and oxygen gas that appears as
bubbles rising in the water
c. iron rusting
d. bubbles forming when a soda can is opened
Solution
a. not a chemical reaction; melting ice forms water, but both the ic...
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