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serious [3.7K]
3 years ago
15

Answers for both boxes please ​

Chemistry
1 answer:
Elan Coil [88]3 years ago
3 0

Explanation:

\frac{6.900 \times  {10}^{10} }{4.000 \times  {10}^{8} }  \\ 1.725 \times  {10}^{10 - 8} \\ 1.725 \times  {10}^{2}

Hope it will help you :)

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HELP ME PLZ!!!! An artist follows this formula for making a special tricolored bracelet: 8 orange beads + 3 red beads + 4 green
Flura [38]

Answer:

1 bracelet.

Explanation:

For one bracelet: 8 orange, 3 red, 4 green, 1 string.

The artist has: 15 orange, 86 red, 92 green, 17 string.

No matter how much of the red and green beads she has, if she only has 15 pieces of orange beads, that will only allow her to make 1 bracelet.

5 0
3 years ago
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I know that the answer is C. 8, but can you explain step by step how to get that answer?
Leya [2.2K]

Answer:

8

Explanation:

Oxidation:

Fe^{2+} -->Fe^{3+}+e^{-}

Reduction:

Cr_{2}O_{7}^{2-}+6e^{-} -->2Cr^{3+}

We have to equalise the number  of moles of electrons gained and lost in a redox reaction in order to get a balanced reaction.

Hence we have to multiply the oxidation reaction throughout by 6.

and adding the two half-reactions we obtain:

6Fe^{2+}+Cr_{2}O_{7}^{2-} -->6Fe^{3+}+2Cr^{3+}

Still the total charge and number of oxygen is not balanced.

Since the reaction takes place in acidic conditions, we will add required number of H+ to the appropriate side to balance the charge and add half the amount of H2O to balance the hydrogen atoms.

We add 14 H+ on LHS and 7H2O on RHS to obtain:

6Fe^{2+}+Cr_{2}O_{7}^{2-}+14H^{+} -->6Fe^{3+}+2Cr^{3+}+7H_{2}O

Sum of coefficients of product cations = 6+2 = 8

4 0
3 years ago
K₂O(s) + H₂O (l)-> KOH(aq)
Ber [7]

Answer:

K20(s)+H2O(L) -> 2KOH(aq)

6 0
3 years ago
How does changing the volume of water effect solubility?
Kaylis [27]

Answer:

this is because solubility of a salt depends on the amount of salt dissolved per unit volume, hence more amount of solute can be dissolved

4 0
3 years ago
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I NEED HELP PLEASE, THANKS! :)
saw5 [17]

Answer:

Macroscopic observation

Explanation:

The observation is macroscopic because you could observe the transformation with the naked eye.

3 0
3 years ago
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