Answer:
Answer. The answer is 116 kJ
Explanation:
<span>Burning gas in a Bunsen burner is also a chemical change. The methane gas burns with oxygen in the air to form two new substances: carbon dioxide and water vapour. During this chemical reaction heat is also produced. When you try to light a piece of solid wax it melts, but does not burn.
The answer is A. No gas bubbles form.
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Answer:- 3400 balloons
Solution:- Originally the helium gas is at 170 atm pressure and there are 44.0 L of it. The pressure of the balloon filled by this has is 1.1 atm and the volume is 2.0 L. Let's first calculate the pressure of helium gas at 1.1 atm of pressure using Boyle's law, "At constant temperature, the volume of the gas is inversely proportional to the pressure."
The equation used for this is:

= 170 atm
= 1.1 atm
= 44.0 L
= ?
Let's plug in the values and solve this for
.


= 6800 L
Now, 44.0 L of the gas is remaining in the exhausted cylinder at 1.1 atm of pressure.
So, the volume of the gas used to fill the balloons = 6800 L - 44.0 L= 6756 L
2.0 L is the volume of one balloon filled by the helium gas. 6756 L would be the volume of how many balloons?
We could easily solve this on dividing the above calculated total volume used to fill the balloons by the volume of one balloon.
= 3378 balloons
The answer is asked to be reported with two sig figs, so it could be written as 3400 balloons.
Hence, 3400 balloons could be filled by the helium gas.
Answer : The correct option is, the negative log of the hydroxide ion concentration.
Explanation :
pOH : It is defined as the negative logarithm of hydroxide ion concentration. It is a measure of the alkalinity of the solution.
Formula used :
![pOH=-log[OH^-]](https://tex.z-dn.net/?f=pOH%3D-log%5BOH%5E-%5D)
is the concentration of
ions.
When pOH is less than 7, the solution is alkaline.
When pOH is more than 7, the solution is acidic.
When pOH is equal to 7, the solution is neutral.
I believe the answer would be C
The the compound of interest i.e. XCl4, since there are 4 Cl atoms bonded to X. This signifies that the valency of X is 4.
There atomic number of C is 6. It's electronic configuration is giving by 1s2 2s2 2p2. Thus, there are 4 electrons in valence shell of C. This signifies that valency of C is 4. Hence the compound present in present case is CCl4.
Hope this helps :)