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-BARSIC- [3]
3 years ago
5

How many atoms it would take to make up the thickness of a banknote.

Chemistry
1 answer:
natita [175]3 years ago
4 0

Answer:

Since one banknote has a thickness of about 0.1 millimeters, if all the banknotes produced in a year were stacked up, they would reach a height of approximately 300 kilometers, which is about 80 times the height of Mount Fuji.

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If a piece of cadmium with a mass of 37.60 g and a temperature of 100.0 oC is dropped into 25.00 cc of water at 23.0 oC, what wi
zlopas [31]

Answer:

T_{eq}=28.9\°C

Explanation:

Hello!

In this case, since it is observed that hot cadmium is placed in cold water, we can infer that the heat released due to the cooling of cadmium is gained by the water and therefore we can write:

Q_{Cd}+Q_{W}=0

Thus, we insert mass, specific heat and temperatures to obtain:

m_{Cd}C_{Cd}(T_{eq}-T_{Cd})+m_{W}C_{W}(T_{eq}-T_{W})=0

In such a way, since the specific heat of cadmium and water are respectively 0.232 and 4.184 J/(g °C), we can solve for the equilibrium temperature (the final one) as shown below:

T_{eq}=\frac{m_{Cd}C_{Cd}T_{Cd}+m_{W}C_{W}T_{W}}{m_{Cd}C_{Cd}+m_{W}C_{W}}

Now, we plug in to obtain:

T_{eq}=\frac{37.60g*0.232\frac{J}{g\°C}*100.00\°C+25.00g*4.184\frac{J}{g\°C}*23.0\°C}{37.60g*0.232\frac{J}{g\°C}+25.00g*4.184\frac{J}{g\°C}}\\\\T_{eq}=28.9\°C

NOTE: since the density of water is 1g/cc, we infer that 25.00 cc equals 25.00 g.

Best regards!

6 0
2 years ago
Which of these humans activities is a serious threat to marine ecosystems
Paraphin [41]

Answer:

Pollution, non native species being introduced, and other human activities

Explanation:

Human activities affect marine ecosystems as a result of pollution, overfishing, the introduction of invasive species,and acidification, which all impact on the marine food web and may lead to largely unknown consequences for the biodiversity and survival of marine life forms.

5 0
2 years ago
Read 2 more answers
a liquid that boils at a low temperature and evaporates rapidly at room temperature is describe as being
Sunny_sXe [5.5K]

Answer: Volatile

Explanation:

like ethanol(alcohol) it evaporates when you put it in the hand, really fast.

Some people think that it dries when it really evaporated at room temperature from liquid to gas

5 0
3 years ago
When assigning quantum numbers, how many of the same quantum values may two electrons in the same atom share?
olga55 [171]
Three that is the answer to your question
5 0
3 years ago
How many molecules are in 10 moles of Hydrogen?
vivado [14]

Answer:3.2

Mass:32

Molecular weight: 10

Moles: 3.2

8 0
3 years ago
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