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2 years ago

Which of the following shows the energy transformation that

Chemistry

2 answers:

const2013 [10]2 years ago

7 0

Answer: either B, or D

Explanation:

because one of those are the answer

Semmy [17]2 years ago

7 0

Answer:

A, because D destroyed my grade.

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Consider an electron placed in a region of space in which the electric potential spatially. The electron is placed at a point wh

loris [4]

Answer:

$1.33\cdot 10^7 m/s$

Explanation:

For a charged particle accelerated by an electric field, the kinetic energy gained by the particle is equal to the decrease in electric potential energy of the particle; therefore:

$K_f-K_i = -q\Delta V$

where

$K_f$ is the final kinetic energy

$K_i$ is the initial kinetic energy

q is the charge of the particle

$\Delta V$ is the potential difference

In this problem,

$q=-1.6\cdot 10^{-19}C$ is the charge of the electron

$\Delta V=-500 V-(-1000 V)=500 V$

The electron starts from rest, so its initial kinetic energy is

$K_i=0$

Therefore,

$K_f=-(-1.6\cdot 10^{-19})(500)=8\cdot 10^{-17}J$

We can write the final kinetic energy of the electron as

$K_f=\frac{1}{2}mv^2$

where

$m=9.11\cdot 10^{-31} kg$ is the electron mass

v is the final speed

And solving for v,

$v=\sqrt{\frac{2K_f}{m}}=\sqrt{\frac{2(8\cdot 10^{-17})}{9.11\cdot 10^{-31}}}=1.33\cdot 10^7 m/s$

5 0

2 years ago

Atoms that have a full outer level combine with other atoms. Is this true or false

aev [14]

Answer:

false

Explanation:

some atoms already have a full outer level

8 0

3 years ago

Read 2 more answers

What is the answer helpnme plz

kykrilka [37]

MgH2 + 2 H2O → Mg(OH)2 + 2 H2

8 0

2 years ago

Which statement describes the role of consumers in an ecosystem?

SOVA2 [1]

Either C or D. Those r the answers that make more sense.

5 0

2 years ago

Read 2 more answers

Valeric acid, HC5H9O2 (Ka = 1.5 ✕ 10−5), is used in the manufacture of magnesium valerate, a nerve-calming agent. What is the hy

Studentka2010 [4]

Answer:

$[H^+]=0.00332M$

Explanation:

Hello,

In this case, considering the dissociation of valeric acid as:

$HC_5H_9O_2 \rightleftharpoons C_5H_9O_2 ^-+H^+$

Its corresponding law of mass action is:

$Ka=\frac{[H^+][C_5H_9O_2^-]}{[HC_5H_9O_2]}$

Now, by means of the change $x$ due to dissociation, it becomes:

$Ka=\frac{(x)(x)}{0.737-x}=1.5x10^{-5}$

Solving for $x$ we obtain:

$x=0.00332M$

Thus, since the concentration of hydronium equals $x$ , the answer is:

$[H^+]=x=0.00332M$

Best regards.

7 0

2 years ago