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4 years ago

Graph of the relationship between mass and thermal energy

Chemistry

1 answer:

elixir [45]4 years ago

6 0

Thermal energy is the sum of the kinetic and potential energies of all the particles in an object.

Assume that you have 250 gL of water and 1 kg of water at the same temperature.

Then, each water molecule has the same kinetic energy.

The larger sample contains four times as many molecules, so it contains four times as much thermal energy.

Thus, thermal energy is directly proportional to mass.

In symbols, KE ∝ m or KE = km.

The graph of a direct proportion is a straight line passing trough the origin.

It should look something like the graph below.

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Which of the following would force the reaction to favor the produc to favor the products ? CaCO3(8) 2H3O'(aq) Cal(aq) + 3H200)

kotykmax [81]

Explanation:

(a) According to Le Chatelier's principle, any disturbance caused in an equilibrium reaction will shift the eqilibrium in a direction that will oppose the change.

For example, $CaCO_{3}(s) + 2H_{3}O^{+}(aq) \rightleftharpoons Ca^{2+}(aq) + 3H_{2}O(l) + CO_{2}(g)$

So, in this reaction when we any of the reactants then it means there is less stress on reactant side. Hence, the reaction will move in the backward direction.

Whereas when we remove $CO_{2}$ then there will be decrease in concentration of products as the concentration of carbon dioxide has decreased. Hence, the reaction will shift on the product side, that is, reaction will shift in the forward direction.

Thus, we can conclude that out of the given options removing $CO_{2}$ as it is formed would force the reaction to favor the produc to favor the products.

(b) As the reaction equation is as follows.

$3NO(g) \rightleftharpoons N_{2}O(g) + NO_{2}(g) + Heat$

Since, it is an exothermic reaction, that means when temperature is increasing then more amount of energy will release on the product side.

Hence, the reaction will shift on the reactant side, that is on the left hand side equilibrium will shift.

5 0

4 years ago

2. A sample of gas has a pressure of 861.05 kPa at a temperature of 25°C. What temperature is required to

wlad13 [49]

Answer:

The final temperature is 414.34 degrees Celsius.

Explanation:

Gay-Lussac's law gives the relation between pressure and temperature. It states that at constant volume, pressure is directly proportional to the temperature of the gas.

$P\propto T$

We have,

Initial pressure, $P_1=861.05\ kPa$

Initial temperature, $T_1=25^{\circ} C= 298.15\ K$

Final pressure, $P_2=1985.48\ kPa$

It is required to find new temperature, using Gay-Lussac's law as:

$\dfrac{P_1}{P_2}=\dfrac{T_1}{T_2}$

$T_2=\dfrac{P_2T_1}{P_1}\\\\T_2=\dfrac{1985.48\times 298.15}{861.05}\\\\T_2=687.49\ K$

$T_2=414.34^{\circ} C$

So, the final temperature is 414.34 degrees Celsius.

5 0

3 years ago

When substances form liquid solutions, what two factors are involved in determining the solubility of the solute in the solvent?

liraira [26]

Answer:The tendency toward randomness drives the solution process. & The new solvent-solute intermolecular attractions must about the same as the solvent-solvent and solute-solute attractions.

Explanation:

Increase in entropy is a major driving force in chemistry. The dissolution of particles in solvent increases the entropy of the solution hence is a driving force and an important factor that influences solubility. Secondly, the degree of solute-solvent interaction must be approximately the same as that of solute-solute and solvent-solvent interaction since like dissolves like and dissolution of a solute in a solvent depends on intermolecular interaction between solute and solvent.

4 0

4 years ago

What is the relation of pressure of a liquid with depth and density

MArishka [77]

Answer:

For any given liquid with constant density throughout, pressure increases with increasing depth. For example, a person under water at a depth of h1 will experience half the pressure as a person under water at a depth of h2 = 2h1.

Explanation:

3 0

3 years ago

Which physical properties do all stars have? Check all that apply. They are made of gases? They shine very bright? They have a s

FromTheMoon [43]

Answer:

All of the above

Explanation:

A star is a hot, giant, massive body that is located millions of miles away. These stars appears to be shiny because of its high temperature that glows producing light. They are comprised of gases such as hydrogen and helium, and they release a huge amount of energy when two hydrogen atoms undergoes fusion.

They generally look star shaped (circular type) from earth but they are somewhat spherical in shape due to their gravity that forces them to get bulge at its equator during its rotation around its own axis.

They have a core that contains iron in them and they progressively formed after the exhaustion of the hydrogen and helium fuel.

Hence, all the given options are correct.

7 0

3 years ago

Read 2 more answers