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zheka24 [161]
3 years ago
5

A cubic piece of metal measures 2.50 cm on each edge. If the metal is nickel, whose density is 8.90 g/cm3, what is the mass of t

he cube?
Express your answer using three significant figures.
Chemistry
1 answer:
madreJ [45]3 years ago
6 0
Volume of cube = a³

2.50 * 2.50 * 2.50 =  15.625 cm³

Density = 8.90 g/cm³

mass = ??

m = D * V

m = 8.90 * 15.625

m = 139.0625 g

hope this helps!
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Please answer ASAP!!
Alenkasestr [34]

Answer:

C.0.28 V  

Explanation:

Using the standard cell potential we can find the standard cell potential for a voltaic cell as follows:

The most positive potential is the potential that will be more easily reduced. The other reaction will be the oxidized one. That means for the reactions:

Cu²⁺ + 2e⁻ → Cu E° = 0.52V

Ag⁺ + 1e⁻ → Ag E° = 0.80V

As the Cu will be oxidized:

Cu → Cu²⁺ + 2e⁻

The cell potential is:

E°Cell = E°cathode(reduced) - E°cathode(oxidized)

E°cell = 0.80V - (0.52V)

E°cell = 1.32V

Right answer is:

<h3>C.0.28 V </h3>

<h3 />

4 0
3 years ago
Salts usually have a low melting point true or false
antoniya [11.8K]
Hello!

This is false!! It is the other way around. They usually have a very high melting point. For example table salt is around 800deg C which is approx just under 1500deg F.

Hope this helps. Thank you
3 0
3 years ago
How many molecules are there in 7.27 miles of ammonia?
NemiM [27]

Hey There!

To solve this question remember that 1 mole of ammonia is equal to 17G of ammonia.

Using that, we first multiply 17 by 7 = 24

Then we multiply 7 by .27 = 1.89

Finally, taking those and adding them together gives you the answer...

<u>25.89 grams :)</u>

<u></u>

<u>Have a great day, I hope I helped.</u>

<u></u>

<u>+ Brainliest & Five stars are always appreciated </u>

4 0
3 years ago
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jolli1 [7]
Shielding effect being attendency of the inner electrons to repel the outermost electrons, an increase in shielding effect increases atomic radius and decrease reduces the atomic radius
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3 years ago
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eimsori [14]
Google says it's the first one.

6 0
3 years ago
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