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3 years ago

What would be the final volume of the new solution if the 0.2 m solution on the left were diluted to 0.04 m? ml quizley?

1 answer:

3 0

Missing question: volume of solution on the left is 10 mL.
V₁(solution) = 10 Ml.
c₁(solution) = 0.2 M.
V₂(solution) = ?.
c₂(solution) = 0.04 M.
c₁ - original concentration of the solution, before it gets diluted.
c₂ - final concentration of the solution, after dilution.
V₁ - volume to be diluted.
V₂ - final volume after dilution.
c₁ · V₁ = c₂ · V₂.
10 mL · 0.2 M = 0.04 M · V₂.
V₂(solution) = 10 mL · 0.2 M ÷ 0.04 M.
V₂(solution) = 50 mL.

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2 years ago

Examine the following isotopes of silicon (Si).

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Answer:

They all have the same number of protons but different numbers of neutrons.

Explanation:

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The atomic number is the number of protons in an atom. For a neutral atom, it is the same as the number of electrons.

The mass number is the number of protons and neutrons in an atom.

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silicon-29 (29Si)

silicon-30 (30Si)

All of these isotopes have an atomic number of 16

Now let us chech for the neutrons:

Number of neutrons = mass number - atomic number:

for silicon-28 (28Si) : 28-16 = 12 neutrons

silicon-29 (29Si) : 29-16 = 13 neutrons

silicon-30 (30Si): 20-16 = 14 neutrons.

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