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kicyunya [14]
2 years ago
6

Suppose you have an Internet friend who study chemistry just like you are your friend claims the change from liquid water to wat

er vapor is a chemical change write a brief email that might convince your friends otherwise
Chemistry
1 answer:
svlad2 [7]2 years ago
7 0
It is not a chemical change because a chemical change is when the substance changes to a whole new substance (ex rust on a car) ex2(fire burning wood) it’s not the same substance) it is a physical change because it’s still water basically (ex: like melting ice, it’s still ice( not a whole different substance)
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Mass of 12 helium atom​
atroni [7]
48.024 grams is the correct mass, because helium has an atomic mass of 4.002g, so all you have do is multiply 12 by 4.002 to get your mass of 12 helium atoms.
4 0
2 years ago
I need help with this. If you don't know it please don't answer it. And make it were the answer makes sense.
Alja [10]
Kaity is the answer have a good day
8 0
2 years ago
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if a tiny marble has a radius of 0.25mm how many marbles can be lined up across the circumference of the earth, distance of 2490
horsena [70]

Answer : The number of marbles lined up across the circumference of the earth can be, 8.013\times 10^{10} marbles

Explanation :

First we have to calculate the diameter of tiny marble.

Diameter=2\times Radius

r = radius of marble = 0.25 mm

Diameter=2\times (0.25mm)=0.50mm

Now we have to calculate the number of marbles can be lined up across the circumference of the earth.

Given:

Circumference of the earth distance = 24900mile=4.00641\times 10^{10}mm

conversion used: 1mile=1.609\times 10^6mm

Number of marbles can be lined up = \frac{4.00641\times 10^{10}mm}{0.50mm}=8.013\times 10^{10} marbles

Thus, the number of marbles lined up across the circumference of the earth can be, 8.013\times 10^{10} marbles

3 0
2 years ago
Which of the following is the us measurement for volume?
tester [92]
I think is feet because you mostly you feet the centimeters
7 0
2 years ago
The enthalpy of formation of water is –285.8 kJ/mol. What can be inferred from this statement?
Aleks04 [339]

The minus sign in ' –285.8 kJ/mol'  indicates that the formation of water is an exothermic process. In an exothermic process heat is released by the system.

On the contrary, a positive value of the heat of formation indicates that the process is endothermic. In an endothermic process heat is absorbed by the system.




8 0
2 years ago
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