This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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Here are the answers to the questions: Multiple Choice Questions: 1. Plants make their own food in the presence of: d. all of these* Plants require sunlight, water, and carbon dioxide for photosynthesis. 2. Rusting of iron can be prevented by: a. galvanisation* Galvanisation involves coating iron with a layer of zinc to prevent rust. 3. Melting of butter is which kind of change: a. physical* Melting is a change of state, where the butter changes from solid to liquid but its chemical composition remains the same. 4. During exothermic chemical reactions heat is: a. released* Exothermic reactions are characterized by the release of heat energy. 5. Which gas is formed when Baking Soda and Vinegar reaction. d. Carbon dioxide* The reaction between baking soda (sodium bicarbonate) and vinegar (acetic acid) produces carbon dioxide gas. Fill in the blanks: 1. Chemical changes are usually irreversible in nature. Chemical changes result in new substances and are generally not reversible. 2. The process of crystallization involves cooling of a saturated solution. Crystallization is the process of forming crystals from a saturated solution upon cooling. What's next? Send 'em!