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shutvik [7]
3 years ago
12

Which of the substances are elements please help

Chemistry
1 answer:
ivanzaharov [21]3 years ago
6 0

Answer:

Substances 1 and 2

Explanation:

an element only has 1 kind of atoms :3

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Answer:

The physical and chemical properties of the product do not match the properties of the reactant.

Explanation:

Chemical change:

The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.

These changes are irreversible

These changes occur due to chemical reactions

These may not be observed with naked eye

Example:

Combustion of fuel or wood: that oil or wood convert into energy, CO2 and ash in case of wood

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The reaction between sugar and oxygen form a product which is different from the reactant that's why it indicate the occurrence of chemical reaction.

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3 years ago
If the p-side has a higher doping concentration, explain how to keep tuning to the same radio channel?
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increase in temperature of the intrinsic semiconductor

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A balance in the intrinsic concentration helps in tuning to the same radio channel.

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