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Explain why the catalyst is used as a very fine powder and larger pieces of iron are not used.

Allushta [10]

Answer:

<h2>Reason:</h2>

Catalyst is used as a very fine powder and larger pieces of iron are not used. This is because the surface area of catalyst needs to be large so that more of the surface is exposed to the substrate and more of the substrate is catalyzed.

<h2>Important Info:</h2>

=> Larger Pieces of Iron has a smaller surface area than the fine particles.

=> Larger the surface area of catalysts/enzymes , more will be the reaction rate and vice versa.

Hope this helped!

<h2>~AnonymousHelper1807</h2>

7 0

3 years ago

A) What is the maximum number of grams of nickel bromide that can be produced from the reaction of 67.8 g of nickel with 37.3 g

svetoff [14.1K]

Answer:

The answer to your question is a) 51.07 g of NiBr₂ b) Nickel, 54 g

Explanation:

Data

mass of NiBr₂ = ?

mass if Ni = 67.8 g

mass of Br = 37.3 g

Balanced chemical reaction

Ni + Br₂ ⇒ NiBr₂

Process

1.- Find the atomic mass of the reactants and the molar mass of the product

Ni = 59 g

Br = 79.9 x 2 = 159.8 g

NiBr₂ = 59 + 159.8 = 218.8 g

2.- Find the limiting reactant

theoretical yield Ni/Br₂ = 59/159.8 = 0.369

experimental yield Ni/Br₂ = 67.8/37.3 = 1.81

The limiting reactant is Bromine because the experimental yield was lower than the theoretical yield.

3.- Calculate the mass of NiBr₂

159.8 g of Br₂ --------------- 218.8 g of NiBr₂

37.3 g of Br₂ -------------- x

x = (37.3 x 218.8) / 159.8

x = 8161.24/159.8

x = 51.07 g of NiBr₂

4.- Find the excess reactant

The excess reactant is Nickel

59 g of Ni ---------------- 159.8 g of Br₂

x ---------------- 37.3 g of Br₂

x = (37.3 x 59)/159.8

x = 2200.7/159.8

x = 13.77 g of Ni

Excess Ni = 67.8 - 13.77

= 54 g

5 0

3 years ago

A mixture consists of sand and an aqueous salt

Alenkinab [10]

Answer is (4).

Explanation:

The given mixture contains an insoluble solid and an aqueous solution of salt. The insoluble solid is sand. 

First we have to separate insoluble solid. Sand can be separated by doing filtration. When we filter the mixture sand can be seen as the residue on the filter paper.

After filtering the mixture, we should collect the filtrate. Filtrate is the salt solution. By doing evaporation we can get the solid salt. 

First and second choices are wrong because after evaporating water filtration cannot be done and salt and sand will be mixed together.

Salt cannot be filtered out because the salt is soluble and it is in aqueous medium. Hence, third choice is wrong

7 0

3 years ago

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A flask contains 0.340 mol of liquid bromine, br2. determine the number of bromine molecules present in the flask.

marshall27 [118]

Avogadro's number represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. This number can be used to convert the number of atoms or molecules into number of moles. We calculate as follows:

0.340 mol Br2 ( 6.022 x 10^23 molecules / mol ) = 2.05 x 10^23 molecules

7 0

3 years ago

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Explain why the coin is able to float on top of the water in this glass.

zubka84 [21]

Surface tension is the result of water molecules pulling inward with a strong attractive force.
The attractive force brings the molecules on the surface of the water close together.
The attractive force causes the surface of the water to be drawn toward the water molecules beneath the surface. 
Since there are no water molecules above the surface, there are uneven forces. This causes surface tension, allowing the coin to float on the water’s surface.

4 0

3 years ago

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