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ale4655 [162]
3 years ago
8

In a periodic table, dots around an elements symbol indicate the number of valence electrons in an atom ? True Or False

Chemistry
1 answer:
Liono4ka [1.6K]3 years ago
6 0
True,I think.(so don't really count on my answer sorry :D)
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You are given 230 grams of a substance with a half-life of 0.75 years. How much will remain after 3 years?
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After 3 years, the substance will go through 4 half lives. You can do 230*(1/2)^4, which is 14.375.
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What is the amount of moles in 67 g of C​
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Explanation:

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Coal and petroleum are useful because the both have ___ stored in them.
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What is the molarity of a NaOH solution if 28.2 mL of a 0.355 M H2SO4 solution is required to neutralize a 25.0-mL sample of the
Verdich [7]

Answer:

[NaOH} = 0.4 M

Explanation:

In a reaction of neutralization, we determine the equivalence point of the titration. In this case, we have a strong base and a strong acid.

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2NaOH  +  H₂SO₄  →  Na₂SO₄  + 2H₂O

As we have 2 protons in the acid, we need 2 OH⁻ from the base to form 2 molecules of water.

In the equivalence point we know mmoles of base = mmoles of acid

Let's finish the excersise with the formula

25 mL . M NaOH = 28.2 mL  .  0.355M

M NaOH = (28.2 mL  .  0.355M) / 25 mL → 0.400

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