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Nastasia [14]
2 years ago
5

Which of the following is an alkaline earth metal?

Chemistry
1 answer:
svetlana [45]2 years ago
4 0
Magnesium is the answerr
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The pH of an acid solution is 5.82. Calculate the Ka for the monoprotic acid. The initial acid concentration is 0.010 M.
blagie [28]

Answer:

The answer is

<h3>Ka = 2.29 \times  {10}^{ - 14} moldm^{ - 3}</h3>

Explanation:

The Ka of an acid when given the pH and concentration can be found by

<h3>pH =  -  \frac{1}{2}  log(Ka)  -  \frac{1}{2}  log(c)</h3>

where

c is the concentration of the acid

From the question

pH = 5.82

c = 0.010 M

Substitute the values into the above formula and solve for Ka

We have

<h3>5.82 =   - \frac{1}{2}  log(Ka)  -  \frac{1}{2}  log(0.010)</h3><h3 /><h3>-  \frac{1}{2}  log(Ka)  = 5.82 + 1</h3><h3 /><h3>-  \frac{1}{2}  log(Ka)  = 6.82</h3>

Multiply through by - 2

<h3>log(Ka)  =  - 13.64</h3>

Find antilog of both sides

We have the final answer as

<h3>Ka = 2.29 \times  {10}^{ - 14} moldm^{ - 3}</h3>

Hope this helps you

8 0
3 years ago
Describe the range of the radii of most atoms
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The radii of most atoms are actually measured in the Ǻ, or Angstrom. We can do it in nanometers too, however. 
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<span>Therefore, the typical atomic radius is between .031 and .27 nm.</span>
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You add two substances together in a sealed bag and a chemical reaction happens. The mass before the reaction was 167 g. What wa
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167g. Because the law of conservation of mass says that matter can not be created or destoryed, in a chemical reaction.
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Saltpeter is a compound made of potassium(K), nitrogen(N), and oxygen(O). Every 100.0g of saltpeter contains 38.67g potassium an
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Use a proportion ... 
<span>100.0g - 38.67g - 13.86g = 47.47g Oxygen </span>
<span>285.0 mg = 0.285g </span>
<span>47.47/100 = x/0.285g </span>
<span>x = ( 47.47/100) X 0.285g </span>
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Static charges can be applied to neutral objects by friction, induction or conduction. What do all of these methods utilize to c
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