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2 years ago

Question 3 Multiple Choice Worth 4 points)

Chemistry

2 answers:

Leviafan [203]2 years ago

8 0

Answer: C.

Explanation:

Its C because a controlled experiment would make the pill's statement true.

(give me brainlist)

fredd [130]2 years ago

4 0

Answer:

The correct answer will be option-C.

Explanation:

Pseudoscience is the practice or theories which is based on the belief system and not on the scientific methods. The personal opinions based on the belief system are used as facts and evidence support the theories.

In the given question, the pills were recommended by the doctors to heavy patients to lose weight. The pills were recommended on the basis that it reduced the weight of some patients which can be considered as experimental samples.

The pill was not used on the persons with normal weight which could be used as a reference to the experimental samples. Thus, the selected option is the correct answer.

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Y_Kistochka [10]

Answer:

The total pressure of the mixture in the tank of volume 6.25 litres at 51°C is 1291.85 kPa.

Explanation:

For N2,

Pressure(P₁)=125 kPa

Volume(V₁)=15·1 L

Temperature (T₁)=25°C=25+273 K=298 K

Similarly, for Oxygen,

Pressure(P₂)= 125 kPa

Volume(V₂)= 44.3 L

Temperature(T₂)=25°C= 298 K

Then, for the mixture,

Volumeof the mixture( V)= 6.25 L

Pressure(P)=?

Temperature (T)= 51°C = 51+273 K=324 K

Then, By Combined gas laws,

$\frac{P_{1} V_{1} }{T_{1} } +\frac{P_{2} V_{2} }{T_{2} } =\frac{PV}{T}$

or, $\frac{15.1*125}{298} +\frac{44.3*125}{298} =\frac{P*6.25}{324}$

or, $6.34+18.58=\frac{P*6.25}{324}$

or, $P=\frac{24.92*324}{6.25}$

∴P=1291.85 kPa

So the total pressure of the mixture in the tank of volume 6.25 litres at 51°C is 1291.85 kPa.

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