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ollegr [7]
3 years ago
14

PLEASE HELP! Why is it unlikely to find pure alkali metals in nature? A)They are made in the laboratory. B)They are so rare. C)T

hey are highly reactive. D)They have low reactivity.
Chemistry
2 answers:
ddd [48]3 years ago
3 0
C) They are highly reactive.
Olegator [25]3 years ago
3 0

The answer is C "They are highly reactive"

Hope this helps.

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A gas storage tank has a volume of 15 L when the temperature is 115 C and the pressure is 114 kPa. What is the new volume of the
Evgesh-ka [11]

<u>Answer:</u> The new volume of the tank is 4.67 L

<u>Explanation:</u>

To calculate the volume when temperature and pressure has changed, we use the equation given by combined gas law.

The equation follows:

\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}

where,

P_1,V_1\text{ and }T_1 are the initial pressure, volume and temperature of the gas

P_2,V_2\text{ and }T_2 are the final pressure, volume and temperature of the gas

We are given:

P_1=114kPa\\V_1=15L\\T_1=115^oC=[115+273]K=388K\\P_2=250kPa\\V_2=?\\T_2=-8^oC=[-8+273]K=265K  

Putting values in above equation, we get:  

\frac{114kPa\times 15L}{388K}=\frac{250kPa\times V_2}{265K}\\\\V_2=\frac{114\times 15\times 265}{388\times 250}=4.67L

Hence, the new volume of the tank is 4.67 L

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What do engineers do while designing solutions to problems? Please 3 sentences or more.
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They figure out solutions
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