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Vesna [10]
2 years ago
9

Which statement best describes the movement of energy?.

Chemistry
1 answer:
hodyreva [135]2 years ago
6 0
I’m 90% sure the answer is-High to low
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Calculate freeze 62.9 g of iron at 1535oC<br> Hf (J/g)=257
Inessa [10]

Answer:

<u>-16200J</u>

Explanation:

(257J/g)(62.9g)

eliminate the variables

u get 16165.3

go to 3 significant digits

u get 16200

and since it is freezing we are taking out energy so it would be

-16200J

4 0
3 years ago
What is the area under the curve for the histogram below?
kodGreya [7K]

Answer:

Explanation:

There is no histogram

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What is the Molar mass of Na3P
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Answer:

99.943071 g/mol

Explanation:

22.98977*3+30.973761

6 0
3 years ago
If there is currently 50kg of U-235 present in Oklo, how much must have been present 750 million years ago when the reaction too
Viefleur [7K]
To answer this question, you need to know the concept of half-life, which is how a radioactive material decreases in mass over time.

The half life of U-235 is 703.8 million years. The first part of this problem is to find the scale factor. To do this, divide the time that has past by the half life, like this:

\frac{750}{703.8}  = 1.066
Now, take this scale factor and multiply it by the current mass, like this:

50 \times 1.066 = 53.3
This number is what you add to the current mass to get the original mass. That is because the scale factor showed us that it was just over one half life. Since after one half life, the mass is cut in half, and this is over one half life, when we add to the original it will be a little over double. This equation illustrates the final addition:

50 + 53.3 = 103.3
I hope this helped you. Fell free to ask any further questions.
7 0
3 years ago
Based on the information in the graph, what is the relationship between air temperature and the amount of water vapor that the a
NeTakaya

Answer:

1 i think

Explanation:

5 0
3 years ago
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