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4 years ago

Which of the following elements has the lowest electronegativity?

Chemistry

1 answer:

just olya [345]4 years ago

7 0

A) K is the element with the lowest electronegativity

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The law of definite proportions states that______.

Gwar [14]

Answer:

Law of definite proportions, statement that every chemical compound contains fixed and constant proportions (by mass) of its constituent elements.

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3 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

8 0

4 years ago

If a sample of 4 moles of gas has a pressure of 567.42 kPa and a volume of 12.0 L, what is it's temperature?

Lady_Fox [76]

Your answer is b, hope this helps ;)

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3 years ago

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Which of the following is a characteristic of a salt?

alexdok [17]

Answer:

Salts can be several different colors and may be any of the five tastes, including salty, sweet, bitter, sour or savory. Their odor depends on the acid and base it is comprised of. Salts comprised of strong acids and bases, called strong salts, are odorless.

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3 years ago

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Which example best demonstrates the relationship between temperature and pressure? bubbles forming in dough when it is heated bu

Margaret [11]

I think the correct answer from the choices listed above is the first option. The best example that demonstrates the relationship between temperature and pressure would be that bubbles forming in dough when it is heated. Hope this answers the question.

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3 years ago