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3 years ago

Which of the following chemical reactions is reversible?

Chemistry

2 answers:

lianna [129]3 years ago

8 0

D freezing water into ice because once the ice melts it’s water again

leva [86]3 years ago

3 0

D the freezing of water into ice

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This quiz gonna kill me <br> please help

Sauron [17]

Explanation:

cro ro rvdhfrodj jhpjbcdhjcjcdosjd

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3 years ago

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he population of the Earth is roughly eight billion people. If all free electrons contained in this extension cord are evenly sp

wolverine [178]

1) Drift velocity: $3.32\cdot 10^{-4}m/s$

2) $5.6\cdot 10^{13}$ electrons per person

Explanation:

For a current flowing through a conductor, the drift velocity of the electrons is given by the equation:

$v_d=\frac{I}{neA}$

where

I is the current

n is the concentration of free electrons

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

A is the cross-sectional area of the wire

The cross-sectional area can be written as

$A=\pi r^2$

where r is the radius of the wire. So the equation becomes

$v_d=\frac{I}{ne\pi r^2}$

In this problem, we have:

I = 8.0 A is the current

$8.5\cdot 10^{28} m^{-3}$ is the concentration of free electrons

d = 1.5 mm is the diameter, so the radius is

r = 1.5/2 = 0.75 mm = $0.75\cdot 10^{-3}m$

Therefore, the drift velocity is:

$v_d=\frac{8.0}{(8.5\cdot 10^{28})(1.6\cdot 10^{-19})\pi(0.75\cdot 10^{-3})^2}=3.32\cdot 10^{-4}m/s$

The total length of the cord in this problem is

L = 3.00 m

While the cross-sectional area is

$A=\pi r^2=\pi (0.75\cdot 10^{-3})^2=1.77\cdot 10^{-6} m^2$

Therefore, the volume of the cord is

$V=AL$ (1)

The number of electrons per unit volume is $n$ , so the total number of electrons in this cord is

$N=nV=nAL=(8.5\cdot 10^{28})(1.77\cdot 10^{-6})(3.0)=4.5\cdot 10^{23}$

In total, the Earth population consists of 8 billion people, which is

$N'=8\cdot 10^9$

Therefore, the number of electrons that each person would get is:

$N_e = \frac{N}{N'}=\frac{4.5\cdot 10^{23}}{8\cdot 10^9}=5.6\cdot 10^{13}$

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3 years ago

A motorcycle traveling at 19 m/s starts to slow down steadily, then it stops completely in 10 seconds. What is the motorcycle ac

Dmitry [639]

Answer:

-1,9m/ $s^{2}$

Explanatio:

$a=\frac{v-v_{0} }{t}$

= $\frac{0-19}{10}$ =-1,9m/ $s^{2}$

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2 years ago

The production of ammonia (NH3) is exothermic and is in equilibrium with its breakdown (which is endothermic):

olya-2409 [2.1K]

Answer:

The equilibrium will shift to produce less ammonia

Explanation:

According to Le Chatelier's principle, the reaction will try to oppose anything that is done on it, if it was at equilibrium.

When the concentration of H2 is decreased, you are decreasing the concentration of hydrogen so the reaction tries to increase the concentration of hydrogen by breaking down the ammonia on the products side. This will decrease the output of ammonia

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3 years ago

All of the following are important properties of prokaryotes except A. prokaryotes are often decomposers and enable recycling of

Sladkaya [172]

The answer to this is B.

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