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2 years ago

DUE IN 1 MINUTE HELP I'M DESPERATE

Chemistry

2 answers:

Anna35 [415]2 years ago

8 0

The answer will be a

alexira [117]2 years ago

6 0

I believe the answer is A.

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Pure substance can be __ and __

Aleksandr [31]

It can be an element or a compound

4 0

3 years ago

Calculate for the following electrochemical cell at 25°C, Pt H2(g) (1.0 atm) H (0.010 M || Ag (0.020 M) Ag if E (H) - +0.000 V a

viva [34]

Answer : The correct option is, (b) +0.799 V

Solution :

The values of standard reduction electrode potential of the cell are:

$E^0_{[H^{+}/H_2]}=+0.00V$

$E^0_{[Ag^{+}/Ag]}=+0.799V$

From the cell representation we conclude that, the hydrogen (H) undergoes oxidation by loss of electrons and thus act as anode. Silver (Ag) undergoes reduction by gain of electrons and thus act as cathode.

The half reaction will be:

Reaction at anode (oxidation) : $H_2\rightarrow 2H^{+}+2e^-$

Reaction at cathode (reduction) : $Ag^{+}+1e^-\rightarrow Ag$

The balanced cell reaction will be,

$H_2+2Ag^{+}\rightarrow 2H^{+}+2Ag$

Now we have to calculate the standard electrode potential of the cell.

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

$E^o_{cell}=E^o_{[Ag^{+}/Ag]}-E^o_{[H^{+}/H_2]}$

$E^o_{cell}=(+0.799V)-(+0.00V)=+0.799V$

Therefore, the standard cell potential will be +0.799 V

4 0

3 years ago

A chemical formula represents:

Ivenika [448]

Answer:

Explanation:

it is a molecular formula that represents the number atoms and type of atoms

7 0

3 years ago

Isotopes are created by adding or removing neutrons from the nucleus.

valina [46]

Answer:

<h2>This is TRUE statement... </h2>

Explanation: 

When you remove or add a neutron to the nucleus of an atom, the resulting substance is a new type of the same element and is called an isotope.

<h2>Hope it helps you✨.</h2>

Thanks☸☸

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3 years ago

Which statement regarding the Calvin cycle is false?

scoundrel [369]

Answer:

The statement "Six turns of the cycle are required for every glucose molecule later produced in non–Calvin cycle reactions" is incorrect. It really looks not well-worded.

Explanation:

It is incorrect because Six turns of the cycle are required for every glucose molecule produced in Calvin cycle reactions, no in non-Calvin cycle reactions. This process includes the fixation of 6 molecules of carbon dioxide to produce 1 Glucose (seen as the addition of the two Phosphoglyceraldehide molecules (PGAL). Moreover, the other statements in the questions are correct:

ATP is required during carbon fixation.

The most intensive energy phase is reduction and sugar production.

Twelve NADPH are required for every six CO2 fixed.

NADPH is required for reduction and sugar production.

3 0

3 years ago