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3 years ago

I need help on science if this is true or false

Chemistry

2 answers:

zheka24 [161]3 years ago

5 0

Answer:

I am pretty sure it is False

Explanation:

sukhopar [10]3 years ago

4 0

Answer:

The second statement is false

Explanation:

Diffusion will typically occur until concentration gradients are the same both outside and inside of the cell. In order for the concentration to increase further inside of the cell requires a different transportation method, such as the use of a channel protein.

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Which of the following functions as a form of insulation and long term energy storage?

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C.Lipids ...............

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4 years ago

A galvanic cell at a temperature of 25.0°C is powered by the following redox reaction:

Vlada [557]

Answer: The cell voltage of the given chemical reaction is 2.74 V

Explanation:

For the given chemical reaction:

$Sn^{2+}(aq.)+Ba(s)\rightarrow Ba^{2+}(aq.)+Sn(s)$

Here, gold is getting reduced because it is gaining electrons and nickel is getting oxidized because it is loosing electrons.

Oxidation half reaction: $Ba(s)\rightarrow Ba^{2+}(aq.)+2e^-;E^o_{Ba^{2+}/Ba}=-2.90V$

Reduction half reaction: $Sn^{2+}(aq.)+2e^-\rightarrow Sn(s);E^o_{Sn^{2+}/Sn}=-0.14V$

Substance getting oxidized always act as anode and the one getting reduced always act as cathode.

To calculate the $E^o_{cell}$ of the reaction, we use the equation:

$E^o_{cell}=E^o_{cathode}-E^o_{anode}$

$E^o_{cell}=-0.14-(-2.90)=2.76V$

To calculate the EMF of the cell, we use the Nernst equation, which is:

$E_{cell}=E^o_{cell}-\frac{0.059}{n}\log \frac{[Sn^{2+}]}{[Ba^{2+}]}$

where,

$E_{cell}$ = electrode potential of the cell = ?V

$E^o_{cell}$ = standard electrode potential of the cell = +2.76 V

n = number of electrons exchanged = 2

$[Ba^{2+}]=5.15M$

$[Sn^{2+}]=1.59M$

Putting values in above equation, we get:

$E_{cell}=2.76-\frac{0.059}{2}\times \log(\frac{1.59}{5.15})\\\\E_{cell}=2.74V$

Hence, the cell voltage of the given chemical reaction is 2.74 V

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4 years ago

Uncrewed vehicles launched into space to collect data are called what?

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B. Rovers are what you are looking for

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3 years ago

When an object heats up, it __. When an object cools down, it __.

Len [333]

Answer:

When an object is heated up, its particles gain more kinetic energy and hence its internal energy increases. A change in state will also result in a change in internal energy.

When an object cools down, heat is withdrawn from it. Hence, the entropy of the object decreases. But the decrease in entropy leads to the transfer of energy to the surrounding.

I hope this helps you! Good luck with school! :D

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3 years ago

Read 2 more answers

Definition in your own words

Galina-37 [17]

Answer:

Liquid,gas,solid and plasma

Explanation:

There four phases of matter. These phases are the gas phase(steam), the liquid phase(water), the solid phase(Ice) and finally the plasma phase(moucous).

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3 years ago