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Fynjy0 [20]
4 years ago
11

A student carried out the electrolysis of a KI solution for a period of 15 minutes. He estimated that 8.5 X 10^-4 moles of OH- w

ere produced.
- Write the two half reactions and the net reaction of the electrolysis
Chemistry
1 answer:
Nataliya [291]4 years ago
6 0

Answer:

Catod: K^(+), H2O

2H2O  + 2e^(-)  ---> H2 + 2OH^(-) reduction reaction

Anod: I^(-), H2O

2I^(-) ---> I2 + 2e^(-) oxidation reduction

2H2O + 2I^(-) ---> I2 + H2 +2OH^(-)   ionic net reaction

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Calculate the number of sucrose molecules in a 75.0 gram sample.
zzz [600]

Answer:

1.32*10^23 molecules

Explanation:

sucrose formula: C12H22O11

molar mass: 12(12.01)+22(1.01)+11(16.00)=342.34g/mol

75.0 g C12H22O11 * (1 mol C12H22O11)/(342.34g C12H22O11)=0.219 mol C12H22O11

0.219 mol * (6.022*10^23)/mol = 1.32*10^23 molecules (three sig. figures)

5 0
3 years ago
What are 5 renewable energy Resources and why are they better for the society and the environment
Ket [755]

Answer:

hydroelectric , hydrogen fuel cells , solar power , geothermal , wind power

Explanation:

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5 0
3 years ago
Seawater is composed of salt, sand, and water. is seawater a heterogeneous or homogeneous mixture? explain
Umnica [9.8K]

A mixture is said to be homogeneous if its composition is uniform throughout the mixture. They are referred to as solutions. On the other hand, heterogeneous mixture does not have uniform composition. The substances present in the mixture have visible difference or phases.

Sea water is composed of salt, sand and water. Here, salt and water form homogeneous mixture but due to the presence of sand, the mixture is heterogeneous. Salt dissolves in water and the solution has uniform composition but sand does not dissolve in water, even after vigorous mixing, after some time it settles at the bottom resulting formation of layers. Thus, sea water containing salt, water and sand is a heterogeneous mixture.


4 0
3 years ago
The value of the rate constant for a gas phase reaction can be changed by increasing the A. temperature of the reaction vessel.
prohojiy [21]

Answer:

temperature of the reaction vessel

Explanation:

temperature of the reaction vessel

3 0
3 years ago
Which molecule represents a halocarbon?
MakcuM [25]

Answer:

Halocarbon, any chemical compound of the element carbon and one or more of the halogens (bromine, chlorine, fluorine, iodine); two important subclasses of halocarbons are the chlorocarbons, containing only carbon and chlorine, and the fluorocarbons, containing only carbon and fluorine.

Explanation:

8 0
3 years ago
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