define the following with two examples for each-pure substance, elements, mixture, compound
Answers
Answer:
Pure Substance: The substances that are free from any kind of mixture and contain only one kind of particle are pure substances. Examples of pure substances include iron, aluminum, silver, and gold.
Mixtures: Substances that have two or more different particles are mixtures. Examples of mixture include the salt solution which is a ‘mixture’ of two components, salt, and water.
A pure substance that has only one kind of atom and cannot be broken into two or more simpler substances by physical or chemical means is an element. Therefore, when you break down gold, you still get gold. It is an element.
A pure substance, basically composed of two or more elements and chemically combined in a fixed proportion is called a compound. Therefore, water is a compound. It has two elements, hydrogen and oxygen, combined in a fixed ratio.
Explanation:
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Answer:
Yes, water can stay liquid below zero degrees Celsius. ... When we apply pressure to a liquid, we force the molecules to get closer together. They can therefore form stable bonds and become a solid even if they have a higher temperature than the freezing point at standard pressure.
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