1. Which one is a chemical change - Rusting of iron or melting of iron?
2. Name and state the law which is kept in mind while we balance a chemical equation.
3. State the basic difference between a physical change and a chemical change.
4. What happens when quick lime is added to water?
5. What happens when ZnCO3 is heated in the absence of air? Give the relevant equation.
6. Is burning of a candle, a physical change or a chemical change?
Answers & Comments
Verified answer
Answer:
1. rusting of iron
2. law of conservation of mass
3.in physical change only the physical properties such as size shape etc changes but whereas in a chemical change the whole chemical composition change in short we can say in physical change new substances are not formed and in chemical change new substances are formed
4.Calcium hydroxide Ca ( OH ) 2 is formed along with the liberation of heat.
5. ZnCO 3 ( aq ) → ∆ ZnO ( s ) + CO 2 ( g )
6. it is chemical as well as physical change
Explanation: 2 ans is guessed
6ans explanation: when we burn the candle( which is made up of wax) the wax melts. this is a physical change as no new substance is formed. burning of candle even produces CO2 (Carbon dioxide) which is completely a new substance. Hence, it is a chemical change
Hope it helped Mark me as brainliest plzzzzzzzzzz