Answer the following questions
1. What do you mean by Sublimation?
2. Burning of Candle includes both a chemical change and a physical change isn't? If yes then how?
3. Can molecules further be divided into small particles?
4. What do you mean by Contraction?
5. What do you mean by Decomposition?
Answers
Answer:
Here's your answer!
1. Sublimation is the process in which a solid changes directly to a gas without going through the liquid state. Solid carbon dioxide is an example of a substance that undergoes sublimation.
2. Yes, Burning of candle is both a chemical and physical change because wax of the candle is made of carbon and hydrogen which reacts with oxygen on burning and changes into carbon dioxide gas and water which escapes into the air. This is a chemical change. As a result, candle melts and reduces in size. This is a physical change.
3. Molecule is defined as the smallest particle of a compound which can be further divided in to atoms chemically.
4. Contraction refers to compressing something or reducing the size of a substance.
5.A decomposition reaction is a reaction in which a compound breaks down into two or more simpler substances.
Hope it helps....
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1: sublimation is the transition of a substance directly from solid to the gas state without passing through the liquid state so, all solids that possess an appreciable vapour pressure at a cartain temperature usually can sublime in air e.g water ice just below o zero degree celsius
4., A contraction is the act of decreasing the size of something or shortening it, or it can be process of becoming smaller or compressed. in on the other hand a contraction can also be two words that are combined ,with a few letter often replaced by an apostrophe, like when we change do and not into don't