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How is the kinetic energy of the particles of a substance affected during a phase change? A.) Kinetic energy increases during exothermic changes and decreases during endothermic changes.
B.) Kinetic energy decreases during exothermic changes and increases during endothermic changes.
C.) Kinetic energy does not change, but the potential energy does.
D.) Kinetic energy changes in the opposite way that the potential energy changes.

Answers

Answer 1

Answer:

Answer:

Explanation:

Answer 2

Answer:

Answer: A. Kinetic energy increases during exothermic changes and decreases during endothermic changes

Explanation: During an exothermic change potential energy is converted to kinetic energy. I hope this is correct. :)

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You have a copper cylinder at room temperature (20ºC). You find that the diameter of the copper cylinder is 3.52 cm and the mass of the cylinder is 94.6754 g. What is the length (h) of the copper cylinder in mm? The density of copper is 8.96 g/cm3. (2 points) 4. You

Answers

Answer:

10.8 mm

Explanation:

Step 1: Calculate the volume (V) of the copper cylinder

The cylinder has a mass of 94.6754 g and a density of 8.96 g/cm³. The volume of the cylinder is:

$94.6754 g * (1cm^(3) )/(8.96g) = 10.6 cm^(3)$

Step 2: Calculate the length (h) of the copper cylinder

The diameter (d) of the copper cylinder is 3.52 cm. We can calculate the length using the following expression.

$V = \pi * ((d)/(2))^(2) * h\nh = (4V)/(\pi * d^(2) ) = (4(10.6cm^(3) ))/(\pi * (3.52cm)^(2) ) = 1.08 cm$

Step 3: Convert the length to millimeters

We will use the relationship 1 cm = 10 mm.

$1.08cm * (10mm)/(1cm) = 10.8 mm$

What is the molarity of a solution prepared from 25.0 grams of methanol (CH3OH, density = 0.792 g/mL) with 100.0 milliliters of ethanol (CH3CH2OH)? Assume the volumes are additive.

Answers

Final answer:

The molarity of a solution prepared from 25.0 grams of methanol and 100.0 milliliters of ethanol is approximately 7.80 M.

Explanation:

This is a question about calculating molarity, which is a measure of concentration using moles per liter. To calculate the molarity of a methanol in ethanol, we first have to convert the mass of methanol into moles. The molar mass of methanol (CH3OH) is about 32.04 g/mol. Therefore, 25.0 g of methanol equals about 0.780 moles (25.0 g ÷ 32.04 g/mol).

Next, the volume of ethanol needs to be converted from milliliters to liters. Thus, 100.0 mL becomes 0.100 L. Finally, the molarity is calculated by dividing the moles of methanol by the volume of the ethanol in liters, resulting in a molarity of approximately 7.80 M (0.780 moles ÷ 0.100 L).

Learn more about Molarity here:

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If you have 3.0 moles of argon gas at STP, how much volume will the argon take up?

Answers

if you have 3.0 moles of argon gas at STP u would take up 2.5 volume

Professionalism and why there is a distinction between the healthcare community and public

Answers

Answer:

ye do it is bad for healthcare community has u to do with health to and public

A buffer solution is composed of 4.00 4.00 mol of acid and 3.25 3.25 mol of the conjugate base. If the p K a pKa of the acid is 4.70 4.70 , what is the pH of the buffer?