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PSYCHO15rus [73]
3 years ago
7

This is in since class

Chemistry
1 answer:
Julli [10]3 years ago
7 0

1 - causes the molecules of the object or surface it strikes to vibrate faster, increasing its temperature.

2-carbon dioxide, methane, nitrous oxide, and water vapor it has to be one of these 3

3-The greenhouse effect is the way in which heat is trapped close to Earth's surface by “greenhouse gases.”

4- because of the fossil fuels that people are burning for energy.

5- due to human activities

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If my dog weighs 31.8 kilograms, how much would she weigh in ounces? Round your to the 1st decimal place.
lidiya [134]
Your dog would weigh 1121.7 ounces
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3 years ago
Question 1<br> Review<br> Which laboratory equipment is correctly paired with the unit it measures?
Bad White [126]

Answer:

Cilindros graduados

Explanation:

Son una herramienta de medición primaria para el volumen de un líquido, y tiene varias marcas hacia arriba y hacia abajo a lo largo del contenedor con incrementos específicos. Los cilindros graduados vienen en muchos tamaños; entre más pequeños sean de diámetro, más específicas serán las mediciones de volumen. Al leer el volumen de un cilindro graduado, notarán que el líquido parece tener una muesca; el líquido alrededor de los bordes será más alto que el líquido en el centro, inclinándose hacia abajo como los lados de un trampolín cuando alguien está parado en el medio. Esto se llama el menisco. Alineen el punto más bajo del menisco con la marca más cercana, manteniendo el nivel del cilindro para leer correctamente el volumen.

6 0
3 years ago
What is the heat of reaction (ΔH°rxn) for the combustion of acetone (C3H6O) given the following thermochemical equations? 1. 3 C
nydimaria [60]

Answer : The enthalpy of combustion of C_3H_6O will be -1775 kJ

Explanation :

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

The combustion of C_3H_6O will be,

C_3H_6O(l)+4O_2(g)\rightarrow 3CO_2(g)+3H_2O(l)    \Delta H_{comb}=?

The intermediate balanced chemical reaction will be,

(1) 3C(s)+3H_2(g)+\frac{1}{2}O_2(g)\rightarrow C_3H_6O(l)     \Delta H_1=-285.0kJ

(2) C(s)+O_2(g)\rightarrow CO_2(g)    \Delta H_2=-394.0kJ

(3) H_2(g)+\frac{1}{2}O_2(g)\rightarrow H_2O(l)    \Delta H_3=-286.0kJ

Now we are reversing the reaction 1, multiplying reaction 2 and 3 by 3 and then adding all the equations, we get :

(1) C_3H_6O(l)\rightarrow 3C(s)+3H_2(g)+\frac{1}{2}O_2(g)     \Delta H_1=285.0kJ

(2) 3C(s)+3O_2(g)\rightarrow 3CO_2(g)    \Delta H_2=3\times -394.0kJ=-1182.0kJ

(3) 3H_2(g)+\frac{3}{2}O_2(g)\rightarrow 3H_2O(l)    \Delta H_3=3\times -286.0kJ=-858.0kJ

The expression for enthalpy of combustion of C_3H_6O will be,

\Delta H_{comb}=\Delta H_1+\Delta H_2+\Delta H_3+\Delta H_4

\Delta H_{comb}=(285.0)+(-1182.0)+(-858.0)

\Delta H_{comb}=-1755kJ

Therefore, the enthalpy of combustion of C_3H_6O will be -1775 kJ

3 0
4 years ago
A reaction has a ΔH value of +120 kJ and a ΔS value of -42 J/K. At which of the following temperatures is the reaction spontaneo
ollegr [7]

Answer:

the reaction is spontaneous at T > 2900 K

Explanation:

  • ΔG = ΔH - TΔS

∴ ΔH = +120 KJ

∴ ΔS = (-42 J/K)*(KJ/1000 J) = -0.042 KJ/K

∴ ΔG < 0 ⇒ the reaction is spontaneous

⇒ at T = 2900 K:

⇒ ΔG = 120 - (2900)(-0.042) = 120 - 121.8 = - 1.8 KJ < 0

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3 years ago
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____ [38]

Answer:

Physically and sifted

Explanation:

4 0
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