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3 years ago

When molten rock undergoes crystallization above ground, what type of rock results?

Chemistry

2 answers:

vodka [1.7K]3 years ago

5 0

I am pretty sure that the answer is B. extrusive rock. I hope that this helps you!! Good Luck!!

Eva8 [605]3 years ago

5 0

Extrusive igneous rock

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3 years ago

What element has 42 neutrons

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Explanation:

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3 years ago

The pH of a solution is measured as 4.5. What is the hydrogen ion concentration of the solution?

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Answer:

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Explanation:

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Hydrogen ion concentration = ?

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3 years ago

How much time would it take for 336 mg of copper to be plated at a current of 5.6 A ? Express your answer using two significant

schepotkina [342]

Answer:

1.8 × 10² s

Explanation:

Let's consider the reduction that occurs upon the electroplating of copper.

Cu²⁺(aq) + 2 e⁻ ⇒ Cu(s)

We will establish the following relationships:

1 g = 1,000 mg
The molar mass of Cu is 63.55 g/mol
When 1 mole of Cu is deposited, 2 moles of electrons circulate.
The charge of 1 mole of electrons is 96,486 C (Faraday's constant).
1 A = 1 C/s

The time that it would take for 336 mg of copper to be plated at a current of 5.6 A is:

$336mgCu \times \frac{1gCu}{1,000mgCu} \times \frac{1molCu}{63.55gCu} \times \frac{2mole^{-} }{1molCu} \times \frac{94,486C}{1mole^{-}} \times \frac{1s}{5.6C} = 1.8 \times 10^{2} s$

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3 years ago