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3 years ago

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Tectonic activity causes potential energy to build up in the crust. An earthquake occurs when this potential energy is released

within the crust. Which statement BEST describes what happens when the energy is released?
Select one:

a. It generates seismic waves that spread out in all directions around Earth.

b. It generates heat waves that affect climate changes around Earth.

c. It generates changes in the magnetic field of Earth.

d. It generates changes in the orbiting speed of Earth.

2 answers:

4vir4ik [10]3 years ago

7 0

Answer:

c. It generates changes in the magnetic field of Earth.

Explanation:

please mark this answer as brainlest

LekaFEV [45]3 years ago

3 0

Answer:

C

Explanation:

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Aspirin (acetylsalicylic acid, C9H8O4) is a weak monoprotic acid. To determine its acid-dissociation constant, a student dissolv

Triss [41]

Answer:

1. $3.57\times 10^{-4}$ was the $K_a$ value calculated by the student.

2. $5.93\times 10^{-4}$ was the $K_b$ of ethylamine value calculated by the student.

Explanation:

1.

The $pH$ value of Aspirin solution = 2.62

$pH=-\log[H^+]$

$[H^+]=10^{-2.62}=0.00240 M$

Moles of s asprin = $\frac{2.00 g}{180 g/mol}=0.01111 mol$

Volume of the solution = 0.600 L

The initial concentration of Aspirin = c = $\frac{0.01111 mol}{0.600 L}=0.0185 M$

$HAs\rightleftharpoons As^-+H^+$

initially

c 0 0

At equilibrium

(c-x) x x

The expression of dissociation constant :

$K_a=\frac{[As^-][H^+]}{[HAs]}$ :

$K_a=\frac{x\times x }{(c-x)}$

$=\frac{0.00240 M\times 0.00240 M}{(0.0185-0.00240 )}$

$K_a=3.57\times 10^{-4}$

$3.57\times 10^{-4}$ was the $K_a$ value calculated by the student.

2.

The $pH$ value of ethylamine = 11.87

$pH+pOH=14$

$pOH=14-11.87=2.13$

$pOH=-\log[OH^-]$

$[OH^-]=10^{-2.13}=0.00741 M$

The initial concentration of ethylamine = c = 0.100 M

$C_2H_5NH_2+H_2O\rightleftharpoons C_2H_5NH_3^{+}+OH^-$

initially

c 0 0

At equilibrium

(c-x) x x

The expression of dissociation constant :

$K_b=\frac{[C_2H_5NH_3^{+}][OH^-]}{[C_2H_5NH_2]}$ :

$K_b=\frac{x\times x}{(c-x)}$

$=\frac{0.00741\times 0.00741}{(0.100-0.00741)}$

$K_b=5.93\times 10^{-4}$

$5.93\times 10^{-4}$ was the $K_b$ of ethylamine value calculated by the student.

3 0

3 years ago

What is the final pH of a solution when 0.1 moles of acetic acid is added to water to a final volume of 1L?

kicyunya [14]

Answer:

The pH of solution is 2.88 .

Explanation:

The reaction is :

$CH_3COOH-->CH_3COO^-+H^+$

We know, $K_a$ for this reaction is = $1.76\times 10^{-5}.$

Also, since volume of water is 1 L.

Therefore, molarity of solution is equal to number of moles.

Also, $K_a=\dfrac{[CH_3COO^-][H^+]}{[CH_3COOH]}$

Let, amount of $CH_3COO^- and\ H^+$ produce is x.

So,

$K_a=\dfrac{[x][x]}{[0.1]}\\1.76\times 10^{-5}=\dfrac{[x][x]}{[0.1]}$

$x=0.0013\ mol.$

We know, $pH=-log{x}=-log(0.0013)=2.88$

Therefore, pH of solution is 2.88 .

Hence, this is the required solution.

5 0

3 years ago

1.....What are the 2 major divisions of Biochemistry?

kicyunya [14]

Answer:

Organic and inorganic

Explanation:

6 0

3 years ago

What is a device that converts thermal energy into mechanical energy?

yanalaym [24]

Answer

Automotive Engine

3 0

3 years ago

Calculate ΔGrxn for this equation, rounding your answer to the nearest whole number. CaCO3(s) → CaO(s) + CO2(g) ΔGf,CaCO3 = −1,1

FrozenT [24]

Answer: $\Delta G_{rxn}$ for the given reaction is 130.19kJ/mol

Explanation:

To Calculate the $\Delta G_{rxn}$ , we use the formula:

$\Delta G_{rxn}=\Delta G_{products}-\Delta G_{reactants}$

For the given chemical reaction:

$CaCO_3(s)\rightarrow CaO(s)+CO_2(g)$

We are given:

$\Delta G_{CaCO_3}=-1128.76kJ/mol\\\Delta G_{CaO}=-604.17kJ/mol\\\Delta G_{CO_2}=-394.4kJ/mol$

Now, to calculate $\Delta G_{rxn}$ , we put the values in the above equation:

$\Delta G_{rxn}=(\Delta G_{CaO}+\Delta G_{CO_2})-\Delta G_{CaCO_3}$

$\Delta G_{reaction}=(-604.17-394.4)-(-1128.76)kJ/mol\\\Delta G_{reaction}=130.19kJ/mol$

As, the value of $\Delta G_{reaction}$ comes out to be positive, the reaction is said to be non-spontaneous reaction.

3 0

3 years ago