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masha68 [24]
3 years ago
6

A piece of copper is placed into silver nitrate. Given that the activity of copper is greater than that of silver, what will hap

pen?
A) A copper-silver compound will form.
B) All three elements will combine to form a new compound.
C) No reaction will occur, because the activity of copper is greater than that
of silver.
D) Copper will replace silver to form copper nitrate, because the activity of copper is greater than that of silver.
Chemistry
2 answers:
DerKrebs [107]3 years ago
8 0

Answer:

D

Explanation:

This is because, of chemical reaction

Anna71 [15]3 years ago
7 0
Your answer is D due to chemical change
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As a technician in a large pharmaceutical research firm, you need to produce 250. mL of a potassium dihydrogen phosphate buffer
Reika [66]

Answer:

We will need 147.772 mL of KH2PO4 to make this solution

Explanation:

For this case we can give the following equation:

H2PO4 - ⇄ H+ + HPO42-

With following pH- equation:

pH = pKa + log [HPO42-]/[H2PO4-]

7.05 = 7.21 + log [HPO42-]/[H2PO4-]

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0.6918 = [HPO42-]/[H2PO4-]

Let's say the volume of HPO42-= x  then the volume of H2PO4- will be 250 mL - x

Since both have a concentration of 1M = 1 mol /L

If we plug this in the equation 0.6918 = [HPO42-]/[H2PO4-]

0.6918 = x / (250 - x)

0.6918*250 - 0.6918x = x

172.95 = 1.6918x

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To control this we can plug this in the pH equation

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3 years ago
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The substance(s) to the hath left of the arrow in a chemical equation art hath called reactants.  A reactant is a substance yond is presenteth at the starteth of a chemical reaction.  The substance(s) to the right of the arrow art hath called products.  A product is a substance yond is presenteth at the endeth of a chemical reaction

So in this example, 3CO(g) + Fe2O3(s) art the reactants.

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Desire I holp! Has't a most wondrous day!

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