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IgorLugansk [536]

3 years ago

12

When testing for hydrogen gas in the laboratory a glowing splint is inserted into the gas which results in a pop sound. What is

associated with the formation of the pop sound?
A. physical change
B. chemical change
C. exothermic reaction
D. endothermic reaction

1 answer:

Advocard [28]3 years ago

5 0

C. Exothermic reaction I guess

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WARRIOR [948]

Answer:

11.009306 or 11.009

Explanation:

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3 years ago

How many grams of a stock solution that is 87.5 percent H2SO4 by mass would be needed to make 275 grams of a 55.0 percent by mas

Mandarinka [93]

<span>We're diluting the first solution to make the second solution. This means both solutions will contain the same amount of H2SO4 (it's the concentration of it that changes). If you look at it this way, it's easy to find the unknown mass. Call this unknown mass m. m * 0.875 = 275 g * 0.55 --> m = 173 g What I'm saying here is 87.5% of the mass of the first solution needs to be the same as 55% of the mass of the second solution, because you're using the same amount of H2SO4 in both.

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3 years ago

What does the 2 in 2 CO represent?

Dmitry [639]

Carbon monoxide is the 2 in co

4 0

3 years ago

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Is topaz inorganic???????

cluponka [151]

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3 years ago

A steel cylinder has a pressure of 550 torr at 177 degrees Celsius. What will be the pressure if the temperature is decreased by

Schach [20]

Answer:

$P_2=507.7torr$

Explanation:

Hello there!

In this case, when we have a gas that is undergoing a change in both pressure and temperature, we utilize the Gay-Lussac's equation as shown below:

$\frac{T_2}{P_2}=\frac{T_1}{P_1}$

Thus, since we are given the initial pressure and temperature and the final temperature, we can compute the final pressure as shown below:

$P_2=\frac{P_1}{T_1}*T_2$

So we plug in, by making sure the temperatures are in kelvins, to obtain:

$P_2=\frac{550torr}{(117+273)K}*(87+273)K\\\\P_2=507.7torr$

Best regards!

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3 years ago