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LuckyWell [14K]
3 years ago
15

What type of change occurs when water changes from a solid to a liquid? A. a phase change B. a physical change C. an irreversibl

e change D. both a and b
Chemistry
1 answer:
mars1129 [50]3 years ago
3 0
B, a physical change because it is not destroying the substance.
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What do the coefficients in front of the reactants and products in a chemical reaction represent ?
makvit [3.9K]

It indicates the number of moles of reactants and products

Explanation:

The coefficients in front of the reactants and products in a chemical reaction represents the number of moles of reactants and products.

Every reaction is made up of equal number of moles of reactants and products. Thus, chemical equations are written in such a way to obey the law of conservation of matter.

The numbers used are usually whole numbers and the are very important in stoichiometry.

learn more:

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when you decrease the distance between two magnets that are repelling, you increase the magnetic force. True or false?
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2. they eat plants that get their energy from the sun

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Both Option (I) and Option (III)

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Biomass is usually defined as those organic molecules that are obtained from plants and animals, in order to produce energy. It is a renewable resource. Some of the examples of biomass include wood, crop, animal fossil fuel.

A large number of trees are being cut down to construct these biomass energies such as woods. This results in the deforestation process where the forested areas are converted into empty dry soils. This results in the increasing rate of erosion because the prevailing wind and flowing water can easily carry away the topsoil and loses the fertility of the soil.

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