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nexus9112 [7]
2 years ago
14

PLS HELP URGENT I WILL MAKE BRAINLY AND LIKE FIVE STARS

Chemistry
1 answer:
Gala2k [10]2 years ago
8 0
Chemical to radiant: Turning on a battery operated light.

Gravitational to kinetic: A child going down a slide on a playground.

Elastic to kinetic: A boy shooting a rubber band across the classroom.

Chemical to thermal: Using a gas power heater to warm a room.

Electrical to radiant: Using the light in your room that is plugged into a wall.

Kinetic to thermal: Rubbing your hands together to warm them on a cold day.

Electrical to kinetic: Using a DC electric motor.

Kinetic to electric: Using a hand crank generator to produce electric current.
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2 years ago
A 256 mL sample of HCl gas is in a flask where it exerts a force (pressure) of 67.5 mmHg. What is the pressure of the gas if it
Effectus [21]

Answer:

The pressure in the new flask would be 128\; \rm mmHg if the \rm HCl here acts like an ideal gas.  

Explanation:

Assume that the \rm HCl sample here acts like an ideal gas. By Boyle's Law, the pressure P of the gas should be inversely proportional to its volume V.

For example, let the initial volume and pressure of the sample be V_1 and P_1. The new volume V_2 and pressure P_2 of this sample shall satisfy the equation: P_1 \cdot V_1 =P_2 \cdot V_2.

In this question,

  • The initial volume of the gas is V_1= 256\; \rm mL.
  • The initial pressure of the gas is P_1 = 67.5\; \rm mmHg.
  • The new volume of the gas is V_2 = 135\; \rm mL.

The goal is to find the new pressure of this gas, P_2.

Assume that this sample is indeed an ideal gas. Then the equation P_1 \cdot V_1 =P_2 \cdot V_2 should still hold. Rearrange the equation to separate the unknown, P_2. Note: make sure that the units for V_1 and V_2 are the same before evaluating. That way, the unit of

\begin{aligned} & P_2\\ &= \frac{P_1 \cdot V_1}{V_2} \\ &= \frac{256\; \rm mL \times 67.5\; \rm mmHg}{135\; \rm mL} \\ & \approx 128\; \rm mmHg\end{aligned}.

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3 years ago
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