CHEMISTRY HIGH SCHOOL

As the temperature of a substance decreases, theaverage kinetic energy of its particles
(1) decreases
(2) increases
(3) remains the same

Answers

Answer 1
Answer:

Answer: Option (1) is the correct answer.

Explanation:

Kinetic energy is the energy that arises due to the motion of molecules. Average kinetic energy involves the sum of vibrational, translational and rotational kinetic energies.

When we decrease the temperature then the movement of molecules starts to decrease. As a result, there will be decrease in the average kinetic energy of its particles.

Thus, we can conclude that as the temperature of a substance decreases, the  average kinetic energy of its particles decreases.

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You are doing research on planet X. The temperature inside the space station is a carefully controlled 27 ∘C and the pressure is 761 mmHg . Suppose that a balloon, which has a volume of 855 mL inside the space station, is placed into the airlock, and floats out to planet X.If planet X has an atmospheric pressure of 0.14 atm and the volume of the balloon changes to 3.21 L , what is the temperature, in degrees Celsius, on planet X (n does not change)?

Express your answer using three significant figures.


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Answers

Answer:

-115°C is the temperature on planet X.

Explanation:

Pressure inside the space station = P_1=761 mmHg=(761)/(760)atm=1.00 atm

1 atm = 760 mmHg

Temperature inside the space station =T_1 = 27^oC = 27 + 273 K = 300 K

Volume of the air filled in the balloon = V_1=855 mL=0.855 L

1 mL = 0.001 L

Atmospheric pressure on planet X = P_2=0.14 atm

Temperature on the planet X = T_2=?

Volume of the air filled in the balloon on planet X = V_2=3.21 L

Using combined gas equation :

(P_1V_1)/(T_1)=(P_2V_2)/(T_2)

T_2=(P_2V_2* T_1)/(P_1V_1)

T_2=(P_2V_2* T_1)/(P_1V_1)

=(0.14 atm * 3.21 L* 300K)/(1.00 atm* 0.855 L)=157.7 K

T_2=157.7K=157-273^oC=-115.3^oC\approx -115^oC

-115°C is the temperature on planet X.

Final answer:

Using the ideal gas law, the temperature on planet X is calculated to be approximately -148.5 °C, after converting all units to standard and then adjusting the final result from Kelvin to Celsius.

Explanation:

This is a classic problem in physics that uses the ideal gas law, which states that the pressure of a gas multiplied by its volume is directly proportional to the amount of gas and the temperature. Using the provided data about the initial conditions inside the space station and the final conditions on planet X, the final temperature can be found by using the equation P1V1/T1 = P2V2/T2, where P refers to pressure, V refers to volume, and T refers to temperature.

First, we need to convert all measurements to the standard units: Pressure in atm and volume in liters. So, initially the pressure inside the space station is 761 mmHg or approximately 1 atm (since 1 atm = 760 mmHg), the volume of the balloon is 855 mL or 0.855 L, and the temperature is 27 °C or 300.15 K (since 0 °C = 273.15 K). On planet X, the pressure is given as 0.14 atm and the volume as 3.21 L.

Substituting these values into our ideal gas law equation, we can find the final temperature T2 on planet X: T2 = P2V2T1 / P1V1 = (0.14 atm * 3.21 L * 300.15 K) / (1 atm * 0.855 L) = approximately 124.68 K.

To convert this value from Kelvin to degrees Celsius, we subtract 273.15, getting approximately -148.47 °C.

Therefore, the temperature on planet X is approximately -148.5 °C, given to three significant figures.

Learn more about Ideal Gas Law here:

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Suggest one reason why hydrogen is called a "clean fuel"

Answers

Because there is no carbon, CO2 is not a product of its combustion, only water.

Formula of velocity rate​

Answers

Answer:

V=d/t

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Velocity (v) is a vector quantity that measures displacement (or change in position, Δs) over the change in time (Δt), represented by the equation v = Δs/Δt. Speed (or rate, r) is a scalar quantity that measures the distance traveled (d) over the change in time (Δt), represented by the equation r = d/Δt.

18°C = _____ -255 K 0 K 18 K 291 K

Answers

T K = ºC + 273

T = 18 + 273

T = 291 K

hope this  helps!

Answer:

T = 291 K

Explanation:

Which of the following cannot pass across the placenta?(a) oxygen
(b) waste materials
(c) blood
(d) nutrients

Answers

The placenta is the structure that allows for transfer of wastes, oxygen, and
nutrients between the mother and the fetus.  The fetal blood comes extremely
close to the maternal blood in the placenta, but there is no intermingling of fetal
and maternal blood.  The fetus and mother can even have, and often do have,
different blood types.
Oxygen cannot pass through the placenta

HELP ME THE WHOLE PAGE !!!! Someone help please

Answers

Answer:

In the image below

Explanation:

Hope this helps you :)
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