3 years ago

Who Invented microscopes? (This one is for fun. I will be giving away 50 points to the first person!)

Chemistry

1 answer:

Liula [17]3 years ago

6 0

Zacharias Janssen invented the microscope.

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lilavasa [31]

B) O^2-
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3 years ago

According to the periodic table, which of these elements will form an ion with a –2 charge? calcium

Serga [27]

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3 years ago

Pls help this my final 20 points!!!! Be right

Anastaziya [24]

Answer:

I think it's B

Explanation:

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2 years ago

A galvanic (voltaic) cell consists of an electrode composed of nickel in a 1.0 M nickel(II) ion solution and another electrode c

Andre45 [30]

Answer: The standard potential of the cell is 0.77 V

Explanation:

We know that:

$E^o_{Ni^{2+}/Ni}=-0.25V\\E^o_{Cu^{+}/Cu}=0.52V$

The substance having highest positive $E^o$ reduction potential will always get reduced and will undergo reduction reaction.

The half reaction follows:

Oxidation half reaction: $Ni(s)\rightarrow Ni^{2+}(aq)+2e^-$

Reduction half reaction: $Cu^{+}(aq)+e^-\rightarrow Cu(s)$ ( × 2)

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

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

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

Putting values in above equation follows:

$E^o_{cell}=0.52-(-0.25)=0.77V$

Hence, the standard potential of the cell is 0.77 V

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3 years ago

If the thermal energy of the system increases by 400 j and 1100 j of heat were added to the system how much work did the system

Pie

your answer should be 700J

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3 years ago