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Varvara68 [4.7K]
3 years ago
12

3. A student mixes a solid powder into a beaker of fluid. Which of the following would indicate that a chemical change has defin

itely occurred?​
Chemistry
1 answer:
Ket [755]3 years ago
5 0

Explanation:

A chemical change is a change in which a new kind of substance is produced. Such changes are always accompanied by energy changes.

They are mostly reversible.

Some examples of such reactions are combustion, rusting of iron, precipitation, rancidity of butter, souring of milk.

  • There might be some little change in mass
  • It requires a considerable amount of energy
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Explanation:

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How many molecules are present in 265 moles of CCl
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Answer:

Option C. 1.60x10^26 molecules

Explanation:

Avogadro's hypothesis proved that that 1 mole of any substance contains 6.02x10^23 molecules.

From the above, we understood that 1 mole of CCl4 contains 6.02x10^23 molecules.

If 1 mole of CCl4 contains 6.02x10^23 molecules,

then, 265 moles of CCl4 will contain = 265 x 6.02x10^23 = 1.60x10^26 molecules

From the calculation made above, 265 moles of CCl4 contains 1.60x10^26 molecules.

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3 years ago
125 cm3 of a solution contains 0.25 moles of the solute. What is the concentration of the solution?
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Answer:

Explanation:

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Given:
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