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4 years ago

Which sphere exists because of there is liquid iron as part of the earth's core?

Chemistry

2 answers:

Bingel [31]4 years ago

8 0

I think the answer is C.lithosphere. but i,m not 100% sure.

Feliz [49]4 years ago

4 0

The answer is the magnetosphere

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A certain first-order reaction has a rate constant of 2.75 10-2 s−1 at 20.°c. what is the value of k at 45°c if ea = 75.5 kj/mol

Gekata [30.6K]

Answer:

0.314 s⁻¹

Step-by-step explanation:

Use the Arrhenius equation.

$\ln( \frac{k_2 }{k_1 }) = (\frac{E_{a} }{R })(\frac{ 1}{T_1} - \frac{1 }{T_2 })\\$

Data:

k₁ = 0.0275 s⁻¹; k₂ = ?

Eₐ = 75.5 kJ·mol⁻¹

T₁ = 20 °C = 293.15 K; T₂ = 45°C = 318.15 K

Calculation:

$\ln(\frac{k_{2} }{0.0275}) = (\frac{75 500 }{8.314})(\frac{ 1}{293.15} - \frac{1 }{318.15 })$

$\ln(\frac{k_{2} }{0.0275}) = 9081\times 2.681 \times10^{-4}$

$\ln(\frac{k_{2} }{0.0275}) = 2.434$

$\frac{k_{2} }{0.0275} = \text{e}^{2.434}$

$\frac{k_{2} }{0.0275} = 11.41$

k₂ = 0.0275 × 11.41

k₂ = 0.314 s⁻¹

3 0

3 years ago

Sample of gas occupies 10.0 L at 50 ˚C. Assuming that the pressure is constant what volume will

scZoUnD [109]

Answer:

20 Liters

Explanation:

If the pressure is supposed to be constant, one of Charles - Gay Lussac's laws can be used to solve the exercise. His statement says that "the volume of the gas is directly proportional to its temperature at constant pressure", mathematically it would be:

$\frac{V1}{T1} = \frac{V2}{T2}$

Considering T₁ = 50 ° C; V₁ = 10.0 L; and T₂ = 100 ° C, we can calculate the volume V₂ Clearing it from the equation and replacing the values to perform the calculation:

V2= (V1 x T2) / T1 = (10.0 L x 100°C) / 50 °C = 20 L

Therefore, the gas at 100 ° C will occupy a volume of 20.0 L.

8 0

3 years ago

In bullet points: explain the difference between thermal energy, heat and temperature.

sergeinik [125]

Thermal Energy- is the energy that comes from heat. This heat is generated by the movement of tiny particles within an object. The faster these particles move, the more heat is generated.

Heat-energy is the result of the movement of tiny particles called atoms, molecules or ions in solids, liquids and gases. Heat energy can be transferred from one object to another. The transfer or flow due to the difference in temperature between the two objects.

Temperature- is a measure of how hot or cold something is; specifically, a measure of the average kinetic energy of the particles in an object, which is a type of energy associated with motion.

3 0

4 years ago

The chemical formula for cesium oxide is Cs2O. What is the charge of cesium?

Cerrena [4.2K]

your answer is A if i am wrong let me know

8 0

4 years ago

Read 2 more answers

In a periodic table, dots around an elements symbol indicate the number of valence electrons in an atom ? True Or False

Liono4ka [1.6K]

True,I think.(so don't really count on my answer sorry :D)

6 0

3 years ago