calculate the heat absorbed (kj) when 37.8 grams of ice cubes melt in an insulated container. assume no heat is lost to the surroundings. δhfus = 6.02 kj/mol.

Answers

Answer 1

When ice cubes melt, they absorb heat to break the intermolecular bonds between the water molecules in the solid phase and become liquid water. This heat absorbed is called the heat of fusion.

To calculate the heat absorbed when 37.8 grams of ice cubes melt, we need to know the amount of heat absorbed per mole of ice cubes that melt. This value is called the molar heat of fusion (δhfus), which is 6.02 kJ/mol for water.

First, we need to calculate the number of moles of ice cubes in 37.8 grams. We can do this by dividing the mass by the molar mass of water, which is 18.02 g/mol.

37.8 g / 18.02 g/mol = 2.098 mol

Next, we can use the molar heat of fusion to calculate the heat absorbed by the 2.098 moles of ice cubes that melt.

Heat absorbed = number of moles x molar heat of fusion

Heat absorbed = 2.098 mol x 6.02 kJ/mol

Heat absorbed = 12.64 kJ

Therefore, 37.8 grams of ice cubes absorb 12.64 kJ of heat when they melt in an insulated container assuming no heat is lost to the surroundings.

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Related Questions

This is for Earth Space Science

One of the major events that contributed to Snowball Earth was the series of large volcanic eruptions that occurred 700 million years ago in what is now Canada. These eruptions caused ⎽⎽⎽(blank)⎽⎽⎽⎽⎽ particles to get trapped in the atmosphere. The particles blocked incoming solar radiation, which had a strong ⎽⎽⎽(blank)⎽⎽⎽ effect on the planet.
1. carbon dioxide; warming
2. sulfur gas; warming
3. sulfur gas; cooling
4. carbon dioxide; cooling

Answers

The words that complete the blanks are; carbon dioxide; warming. Option 1

What is volcanic eruption?

The term volcanic eruption has to do with a situation in which molten magma suddenly bursts out of the earth and may solidify to give rise to the emergence of rocks. We know that rocks are the solid parts of the earth hat may occur above or below the earth's crust. During a large volcanic event. It is common that carbon dioxide is evolved into the atmosphere.

To complete the sentence; One of the major events that contributed to Snowball Earth was the series of large volcanic eruptions that occurred 700 million years ago in what is now Canada. These eruptions caused carbon dioxide particles to get trapped in the atmosphere. The particles blocked incoming solar radiation, which had a strong warming effect on the planet.

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A cannonball is shot from level ground with a velocity of 240.0 m/s at an angle of 32 degrees. How long does the ball take to hit the ground?

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The time of flight is obtained as 25.9 seconds

What is the time of flight?

The time of flight is the time taken to move the object that have been projected along the parabolic path. In this case, we have a cannonball that have been fired from level ground with a velocity of 240.0 m/s at an angle of 32 degrees.

We know that from the question

T = 2usinθ/g

T = time of flight

u = initial velocity

θ = angle of projection

g = acceleration

T = 2 * 240.0 m/s * sin 32 degrees/9.8 m/s^2

T = 25.9 seconds

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What is a car’s acceleration if it increases its speed from 5 m/s to 20 m/s in 3 s?

10 m/s 2

15 m/s 2

5 m/s 2

–15 m/s 2

Answers

Answer:

Explanation:

vf = vi + at

20 = 5 + 3a

3a = 15

a = 5

rank the microtidal forces on your own body, from greatest to least, produced by the following: rank from greatest to least. to rank items as equivalent, overlap them. earth sun moon

Answers

Tidal forces depends on the masses and distance between the objects which are connected by gravitational force. The microtidal force generated on our body is higher from earth itself then from moon and last from the sun.

What is tidal force?

Tidal forces is an effect of gravitational pull or more scientifically the change in gravitational potential energy which creates periodic movements in the sea and changes in water level.

Tidal force are generated on earth by the gravitational pull from sun and moon. This force is cyclical and and repeats in a regular manner. Tide force is directly proportional to mass and inversely proportional to the cube of the distance.

Tidal force ∝ mass / (distance)³

Thus, if the force is solely based on the mass we can clearly say that the tidal force from the sun is greater than that from the moon. But when considering the distance, sun is 390 times farther than moon.

Hence, when taking its cube that much lower will the tidal force from sun compare to moon. Therefore, the microtidal forces that we can affect is greater from the earth itself and then from the moon and last from the sun.

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The ability of a telescope to separate two closely spaced stars is called _____.

Answers

its (angular) resolution.

The magnitude of Kw indicates that ________. water autoionizes only to a very small extent the autoionization of water is exothermic water autoionizes very quickly water autoionizes very slowly

Answers

The magnitude of Kw indicates that water autoionizes only to a very small extent.

Kw, also known as the ion product constant of water, is the equilibrium constant for the autoionization of water: H₂O ⇌ H⁺ + OH⁻. The value of Kw at room temperature is 1.0 x 10⁻¹⁴.

which indicates that the concentration of H⁺ and OH⁻ ions produced by the autoionization of water is very low. This means that water autoionizes only to a very small extent, producing a small concentration of H⁺ and OH⁻ ions.

In addition, Kw is also related to the acidity and basicity of solutions. Solutions with a pH less than 7 are acidic because they have a higher concentration of H⁺ ions than OH⁻ ions, while solutions with a pH greater than 7 are basic because they have a higher concentration of OH⁻ ions than H⁺ ions. At pH 7, the concentration of H⁺ and OH⁻ ions is equal, and the solution is neutral.

The value of Kw is therefore an important parameter for understanding the behavior of aqueous solutions and the role of water as a solvent in chemical reactions.

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a laser emits a narrow beam of light. the radius of the beam is 7.8 mm, and the power is 3.8 mw. what is the intensity of the laser beam?

Answers

The intensity of the laser beam is approximately 0.00001997 W/mm^2.

To calculate the intensity of the laser beam, you'll need to use the formula:

Intensity (I) = Power (P) / Area (A)

First, we need to find the area of the circular beam using the radius (r = 7.8 mm). The formula for the area of a circle is:

A = πr^2

A = π(7.8 mm)^2 ≈ 190.44 mm^2

Now, we can calculate the intensity using the power (3.8 mW) and area (190.44 mm^2). Note that we need to convert mW to W:

Intensity (I) = 3.8 mW / 190.44 mm^2 = 0.0038 W / 190.44 mm^2 ≈ 0.00001997 W/mm^2

So, the intensity of the laser beam is approximately 0.00001997 W/mm^2.

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Your adventurous friend Lola goes bungee jumping. She leaps from a bridge that is 100 m above a river. Her bungee cord has an un-stretched length of 50 m and a spring constant k = 600 N/m. Lola has a mass of48 kg. a) How fast is she falling when she just starts to stretch the cord? How long does it take for Lola to reach this point?

Answers

When Lola just starts to stretch the bungee cord, she is falling at a speed of approximately 14.14 m/s. It takes her approximately 3.54 seconds to reach this point.

To find the speed at which Lola starts to stretch the bungee cord, we can use the principle of conservation of mechanical energy. At this point, all of Lola's potential energy is converted to kinetic energy.

The potential energy is given by the equation PE = mgh, where m is Lola's mass, g is the acceleration due to gravity (approximately 9.8 m/s²), and h is the height of the bridge. Substituting the given values, Lola's potential energy is 48 kg * 9.8 m/s² * 100 m = 47040 J.

When the bungee cord starts to stretch, Lola's potential energy starts converting into elastic potential energy stored in the cord. The elastic potential energy is given by the equation PE = (1/2)kx², where k is the spring constant and x is the displacement from the equilibrium position.

At the point when Lola just starts to stretch the cord, x = 50 m (the un-stretched length of the cord). Substituting the values, we can equate the potential energies and solve for Lola's velocity at this point.

(1/2)kx² = mgh

(1/2) * 600 N/m * (50 m)² = 48 kg * 9.8 m/s² * 100 m

15000 N = 47040 J

Lola's velocity = sqrt(2 * (PE / m)) = sqrt(2 * (47040 J / 48 kg)) ≈ 14.14 m/s

To find the time it takes for Lola to reach this point, we can use the equation of motion s = ut + (1/2)at², where s is the displacement, u is the initial velocity, t is the time, and a is the acceleration.

The displacement is 50 m, the initial velocity is 0 m/s (as Lola starts from rest), and the acceleration is the acceleration due to gravity, -9.8 m/s² (negative because it is acting in the opposite direction to the motion).

50 m = 0 m/s * t + (1/2) * (-9.8 m/s²) * t²

50 m = -4.9 m/s² * t²

t² = -50 m / -4.9 m/s²

t ≈ sqrt(10.2 s²) ≈ 3.54 s

Therefore, Lola's speed when she just starts to stretch the cord is approximately 14.14 m/s, and it takes her approximately 3.54 seconds to reach this point.

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What is the length of the line to the correct degree of precision?
92 mm

9.2 mm

9.2 cm

9.23 cm

Answers

Answer:

9.2 cm

Explanation:

on a ruler you can only measure in cm

and the precision is of one decimal point

a 5.0- kg box is pulled by a horizontal force f applied to the top of the box. when the box meets a low doorstep, it begins to rotate around it. the box is 60 cm wide and 100 cm high. what minimum magnitude of the force f is needed to cause this movement?

Answers

The minimum magnitude of the force f is 21 N needed to cause the movement of a 5 kg box pulled by a horizontal force.

What is force and how is the magnitude of force comes out to be 21 N ?Force is the newtonian quantity which represents the product of mass and acceleration.The mass of the box is given to be 5 kg and the box is 60 cm wide and the height is 100 cm .When the block about to rotate normal shifted to the edge of the cube , mg(w/2) = Fh, F = mgx (w/2)= Fh taking g as 9.8 m/s^2.Substituting the values , F = (5 × 9.8 ( 60/2)) / 70Then the force would be , F = (5 × 9.8 × 30 ) / 70,F = 1470 / 70,F = 21 N.Hence the magnitude of the force comes out to be 21 N.Therefore when a 5 kg box is pulled by a horizontal force f applied to the top of the box, the minimum magnitude of the force f needed is 21N.

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Twins Bo and Joe have a combined mass of 200 kg and are zooming along at 10 m/s in a 100 kg amusement park bumper car. They bump into Melinda’s car, which is sitting still. Melinda has a mass of 25 kg and is also in a 100 kg car. After the collision, the twins continue moving with a speed of 4.12 m/s.
a. What is the initial momentum of the system?
b. What must be the final momentum of the system?
c. How fast is Melinda’s car bumped across the floor?

Answers

The speed with which Melinda’s car is bumped across the floor is 14 ms-1.

Total mass of the twins and the car = 300 Kg

Initial velocity of the twins car = 10 m/s

Total mass of Melinda and her car = 125 Kg

Initial velocity of Melinda's car = 0 m/s (at rest)

Final velocity of the twins car = 4.12 m/s

Final velocity of Melinda's car = ?

Initial momentum of the system = (300 × 10) + (125 × 0) = 3000 Kgms-1

Final momentum of the system = (300 × 4.12) + (125 × x) = (1236 + 125x) Kgms-1

Using the principle of conservation of linear momentum;

Total momentum before collision = Total momentum after collision

m1u1 + m2u2 = m2v1 + m2v2

(300 × 10) + (125 × 0) = (300 × 4.12) + (125 × x)

3000 = 1236 + 125x

x = 3000 - 1236 /125

x = 14 ms-1

The speed with which Melinda’s car is bumped across the floor is 14 ms-1.

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A hair dryer draws 9.7A when plugged into a 120V line. What is its resistance? How much charge passes through it in 17min?

Answers

The resistance of the hair dryer is approximately 12.37 ohms, and the charge that passes through it in 17 minutes is approximately 9894 coulombs.

A hairdryer has a current of 9.7 A and is connected to a 120 V power source. To find its resistance, you can use Ohm's Law, which is given by V = I x R, where V is voltage, I is current, and R is resistance. Rearranging the formula, we have

R = V / I.

Substituting the values,

R = 120 V / 9.7 A, gives a resistance of approximately 12.37 ohms.

To determine the charge that passes through the hair dryer in 17 minutes, we can use the formula Q = I x t, where Q is a charge, I is current, and t is time. First, convert the time to seconds: 17 minutes x 60 seconds/minute = 1020 seconds. Now, substitute the values: Q = 9.7 A x 1020 s, which gives a charge of approximately 9894 coulombs.

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All types of electromagnetic radiation travel at the speed of light. True or False?

Answers

Answer:

True

Explanation:

Generally speaking, we say that light travels in waves, and all electromagnetic radiation travels at the same speed which is about 3.0 * 108 meters per second through a vacuum.

Answer:

absolutely true

Explanation:

as it travels in a speed of 30×108 m per second

What is the work done in lifting 60 kg of blocks to a height of 20m

Answers

Answer:

The answer is 1200

Explanation:

Types of Spectra 5) Stars like our Sun have low-density, gaseous atmospheres surrounding their hot, dense cores. If you were looking at the spectra of light coming from the Sun (or any star), which of the three types of spectrum would be observed? Explain your reasoning.

Answers

The spectrum observed from the Sun (or any star) would exhibit an absorption spectrum. This is because the outer gaseous atmosphere of the star absorbs specific wavelengths of light, resulting in dark absorption lines in the spectrum.

In the cooler, lower-density outer atmosphere, where white light from the star travels, some atoms or molecules in the atmosphere absorb photons with particular energy. In the spectrum, these absorptions show up as black lines at specific wavelengths. The specific set of absorption lines that each element or molecule generates results in a distinctive pattern that can be used to identify the elements that are present in the star's atmosphere.

The absorption spectrum offers insightful data on the chemical make-up and physical characteristics of the star. Astronomers can ascertain the elements present, their abundances, and other characteristics like the temperature, pressure, and velocity of the star's atmosphere by examining the absorption lines.

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Which would require more force to move a bowling ball or tennis ball? Why

Answers

According to Newton's law, the greater the mass of the object, the greater force will be required.

The mass of the bowling ball is more than that of the tennis ball.

Thus, the bowling ball requires more force.

Using the elements of the systems perspective, synergy can be thought of as a(n) ______

Answers

Using the elements of the systems perspective, synergy can be thought of as a transformative process. Hence, option b) aligns well with the answer.

Synergy occurs when the integration of different parts of a system results in a whole that is more effective than the sum of its parts. This principle is based on the idea that a system's output is determined by how its individual elements interact with one another. As a result, a systems perspective can aid in the understanding of the causes and consequences of synergistic interactions.

Synergy refers to the phenomenon in which the combined efforts of elements result in a more powerful and effective outcome than they would have achieved individually.

For example, consider a team of employees working together on a project. The group's output may be greater than the sum of each individual's output. This is because each person has unique talents, perspectives, and experiences that they bring to the table.

When these elements are combined in a synergistic manner, the team can achieve results that no individual could have achieved on their own.The transformative process of synergy has many potential benefits. Synergy can lead to innovation, increased productivity, and improved decision-making.

Synergistic systems can be highly resilient, as they are often able to adapt to changing circumstances and maintain stability in the face of disruption. Additionally, synergistic systems are often more efficient, as they minimize duplication of effort and resources.

Finally, the systems perspective on synergy highlights the interconnectedness of the elements within a system. This interconnectedness emphasizes the importance of a holistic approach to problem-solving. Rather than focusing solely on individual components of a system, a systems perspective considers the relationships between those components.

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Dos Autos se acercan uno hacia el otro como se muestra en la figura. Si los carros chocan y quedan pegados, DETERMINE: a) las componentes de la velocidad
después del choque.
b) La velocidad resultante después del choque,
c) El ángulo θ