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Mrac [35]
4 years ago
9

Which of the following elements is the most reactive? a. Be b. Mg c. Ca d. Sr

Chemistry
1 answer:
Nesterboy [21]4 years ago
3 0

Sr is the most reactive. Correct me if I'm wrong :/

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Consider the balanced equation below.
wolverine [178]

Answer:

a) H2S:SO2 = 2:2 and O2:H2O = 3:2

Explanation:

  • 2H2S + 3O2 → 2SO2 + 2H2O

⇒ H2S:SO2 = 2 mol H2S / 2 mol SO2 ≡ 2 : 2

⇒ O2:H2O = 3 mol O2 / 2 mol H2O ≡ 3 : 2

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Wich describes an object in projectile motion?
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viktelen [127]
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What is the ph of a buffer that consists of 0.45 m ch3cooh and 0.35 m ch3coona? ka = 1.8 × 10–5?
oee [108]
Answer is: pH of a buffer is 4.64.

ck(CH₃COOH) = 0.45 M.

cs(CH₃COONa) = 0.35 M.

Ka = 1.8·10⁻⁵.

<span>pKa = -logKa.
</span>pKa = -log(1.8·10⁻⁵) = 4.75.
<span>Henderson–Hasselbalch equation: pH = pKa + log(cs/ck).
</span>pH = 4.75 + log(0.35M/0.45M).
pH = 4.75 - 0.11.
pH = 4.64.

pH (potential of hydrogen) is a numeric scale used to specify the acidity or basicity an aqueous solution.


8 0
4 years ago
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