When astronomers observe distant galaxies, they can tell that most of them are moving away from one another. In addition, the more distant the galaxies, the more rapidly they are likely to be moving away from each other. Can you devise a hypothesis to explain these observations?

Q: Green chemistry rests on a set of 12 principles. What are they?

A: 12 principles of green chemistry has to be given,

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Q: Why do physical properties play a role in chemistry if they do not involve any chemical changes?

A: I

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Q: (a) Under one set of conditions, the substances in A and B mix, and the result is depicted in C.…

A: To find: Whether the following changes are physical or chemical.

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A:

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A: ANSWER

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Q: What is meant by the phrase characteristic properties of matter?

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Q: Question attached

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Q: How would you distinguish mixtures from substances based on the set of properties? Give 2 examples.

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Introduction to chemistry

Chemistry is a branch of science that deals with the analysis of material and the substances that comprise it. It also manages the properties of these substances and their reactions to form new substances. It is basically centered on particles and atoms that make up components and mixtures. These chemical species will in general connect using bonds.