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nika2105 [10]
3 years ago
10

What is the third largest asteroid in the asteroid belt with a diameter of 267 miles

Chemistry
2 answers:
Annette [7]3 years ago
8 0
Ceres, Pallas, and Vesta are the three largest asteroids.
zlopas [31]3 years ago
7 0
Juno is the largest asteroid
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What causes the Brownian motion of particles in a colloid?
LekaFEV [45]

<u>Answer:</u>

The correct answer option is a) collisions between the particles and surrounding molecules.

<u>Explanation:</u>

The collisions between the particles and surrounding molecules causes the Brownian motion of particles in a colloid.

Brownian motion is the irregular movement of the microscopic particles in a fluid which bombard into each other.

It basically is the result of the molecules of a dispersion medium colliding with the dispersed particles of the phase.

6 0
3 years ago
Several properties of the element magnesium are shown. Which one is a chemical property?
aniked [119]

Answer:

E

Explanation:

burning a substance changes it chemically.

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3 years ago
1
Musya8 [376]

Answer:

A perfect mold of a dinosaur bone

3 0
3 years ago
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Choose the correct statement for this question: If two objects have different temperatures, in which direction will heat move? F
Gekata [30.6K]
I would go with the first one
8 0
2 years ago
A sample of ethanol (C2H5OH), weighing 6.83 g underwent combustion in a bomb calorimeter by the following reaction: C2H5OH (l) +
iren [92.7K]

The question is incomplete, here is the complete question.

A sample of ethanol (C_2H_5OH), weighing 6.83 g underwent combustion in a bomb calorimeter by the following reaction:

C_2H_5OH(l)+3O_2(g)\rightarrow 2CO_2(g)+3H_2O(l)

If the heat capacity of the calorimeter and contents was 18.1 kJ/°C and the temperature of the calorimeter rose from 25.50°C to 36.73°C. What is the \Delta H of the reaction?

<u>Answer:</u> The enthalpy of the reaction is -1355.1 kJ

<u>Explanation:</u>

To calculate the heat absorbed by the calorimeter, we use the equation:

q=c\Delta T

where,

q = heat absorbed

c = heat capacity of calorimeter = 18.1 kJ/°C

\Delta T = change in temperature = T_2-T_1=(36.73-25.50)^oC=11.23^oC

Putting values in above equation, we get:

q=18.1kJ/^oC\times 11.23^oC=203.26kJ

Heat absorbed by the calorimeter will be equal to the heat released by the reaction.

<u>Sign convention of heat:</u>

When heat is absorbed, the sign of heat is taken to be positive and when heat is released, the sign of heat is taken to be negative.

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Given mass of ethanol = 6.83 g

Molar mass of ethanol = 46 g/mol

Putting values in above equation, we get:

\text{Moles of ethanol}=\frac{6.83g}{46g/mol}=0.15mol

To calculate the enthalpy change of the reaction, we use the equation:

\Delta H_{rxn}=\frac{q}{n}

where,

q = amount of heat released = -203.26 kJ

n = number of moles = 0.15 moles

\Delta H_{rxn} = enthalpy change of the reaction

Putting values in above equation, we get:

\Delta H_{rxn}=\frac{-203.26kJ}{0.15mol}=-1355.1kJ/mol

Hence, the enthalpy of the reaction is -1355.1 kJ

7 0
3 years ago
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