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pentagon [3]
3 years ago
5

Select the correct answer.

Chemistry
1 answer:
sladkih [1.3K]3 years ago
7 0
C not sure 100 percent but my best guess
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1. A 10 g gold coin is heated from 25°C to 50°C (CAu is 0.13 J/g-°C). What is the H?
Oksanka [162]
The correct answer is + 32.5 J because heat is absorbed here by copper not evolved also after calculation we will find the H value is positive, lets calculate it:
H = m C Δt where:
m = 10 g 
C = 0.13 J/g.°C
Δ t = final temperature - initial temperature = 50 - 25 = + 25 °C
so H = 10 x 0.13 x (+25) = + 32.5 J
 
4 0
3 years ago
In the periodic table hydrogen is placed in Group 1A (group 1) and helium is placed in Group 8A (group 18). The most likely reas
Alexus [3.1K]

Answer:

This question appears incomplete

Explanation:

This question appears incomplete because of the absence of options. However, hydrogen is placed in group 1 because it has just one electron in it's outermost shell (which happens to be the only shell it has) just like every other group 1A/group 1 element. While helium is placed in group 8A/group 18 because it has a completely filled outermost shell (which is also the only shell it has) just like every other element in group 8A/group 18.

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3 years ago
If a stack of 40 solid oxide fuel cells in series generates 1,000 W of power, and each cell contributes equally to the power of
Fittoniya [83]

Answer:

25 W

Explanation:

8 0
2 years ago
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with his well-known gold foil experiment in which he demonstrated that the atom has a tiny and heavy nucleus.

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3 years ago
Please DO NOT ANSWER if you don't know and don't copy and paste from the internet
Nookie1986 [14]

I think so the answer would be Ionic Bonding

Im not sure

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