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3 years ago

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What mass of ni2+ is produced in solution by passing a current of 67.0 a for a period of 12.0 h , assuming the cell is 90.0 % ef

ficient?

1 answer:

jenyasd209 [6]3 years ago

7 0

Idk. Im really confused on this one.

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How does mg2+ block the effect of extracellular calcium on neurotransmitter release?

svetlana [45]

<span>Magnesium is a strong anode than calcium. So, Mg will be oxidized into Mg2+. So instead of having Ca being the reducing agent, Mg will takes its place. That's how the "Blocking" occur.
</span><span>Without Ca2+, no neurotransmitter was released because the exocytosis of the synaptic vesicles is dependent upon Ca2+.
</span>So, when magnesium is added to the extracellular fluid it blocks the calcium channels and inhibits the release of <span>neurotransmitter.</span>

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4 years ago

What mass of solid CaSO4 would need to be added in order to make 1.2L of a 0.75M solution?

liberstina [14]

Answer:

120

Explanation:

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3 years ago

Calculate the mass in amu of 75 atoms of aluminum

lyudmila [28]

<span>Calculating mass using Atomic Mass Units (amu):. Ex. Calculate the mass, in amu, of a sample of aluminum that contains 75 atoms. 1 Al atom = 26.98 amu.</span>

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3 years ago

An iron ball is dropped onto a pavement from a height H. If half of the heat generated goes into warming the ball, find the temp

mr Goodwill [35]

The given question is incomplete. The complete question is as follows.

A 10 kg iron ball is dropped onto a pavement from a height of 100 m. If half of the heat generated goes into warming the ball,find the temperature increase of the ball. (In Sl units, the specific heat capacity of iron is 450 J/kg.C degree).

Explanation:

In the given case, when the ball comes in contact with the pavement then its kinetic energy will be equal to potential energy of the ball before it was dropped. Half the K.E heats the ball.

As K.E = P.E = mgh

So, mgh = $10 \times 10 \times 100$ = 10,000 joules

And, half of this is 5,000 joules

As we know that

Q = $m \times C \Delta T$

5000 = $450 \times 10 \times \Delta T$

$\Delta T = \frac{5000}{4500}$

= 1.11 degrees

Also, in the given situation

$\frac{mgh}{2} = m \times C \times \Delta T$

Since there is an m on both sides of the equation, we will divide both sides by m and the resulting equation will be as follows.

$\frac{gh}{2} = c \times \Delta t$

As, the result is independent of mass which is why the result is the same for any ball of any mass.

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4 years ago

What does the kinetic theory explain?

olya-2409 [2.1K]

I believe the correct answer from the choices listed above is the third option. The kinetic theory explains that heat is due to the motion of molecules. Temperature is the measurement used to measure heat and is directly proportional to the average kinetic energy of the molecules.

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3 years ago

Read 2 more answers