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gayaneshka [121]
3 years ago
15

Which statement best describes the amount of catalyst that remains at the end of a reaction?

Chemistry
2 answers:
Ivenika [448]3 years ago
7 0
I believe the correct answer is C. The amount of catalyst is the same at the end as at the beginning of the reaction. Catalysts can't be consumed by the reaction thus is not D.
gizmo_the_mogwai [7]3 years ago
6 0

Answer is: C) The amount of catalyst is the same at the end as at the beginning of the reaction.

A catalyst is a chemical species that is present at the beginning of a reaction and reappears at the end.  

An intermediate forms during the reaction and disappears before the end.

Catalysis is the increase in the rate of a chemical reaction due to the participation of an additional substance called a catalyst.  

Reactions occur faster with a catalyst because they require less activation energy.

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In any engineering design problem, the first step is to understand the problem and identify one or more possible solutions. In t
Semenov [28]

Answer:

rising pressure and decreasing temperature

Explanation:

Reversible reactions have a bit practical interest, but in some cases the technological benefit or profitability of production requires a shift in the equilibrium of a reversible reaction.

Increasing pressure

With increasing pressure on this system, the concentration of substances increases. In this case, the balance will shift towards smaller volumes. On the left side of the equation, two volumes of nitrogen react with one volume of hydrogen. On the right side of the equation there are two volumes of ammonia, i.e. the number of volumes on the right side of the equilibrium reaction is less than on the left and, therefore, with increasing pressure, the reaction equilibrium will shift to the right.

Decreasing temperature

When the temperature rises, the equilibrium shifts towards the endothermic reaction, and when the temperature decreases, towards the exothermic reaction and the reaction given above is the exothermic.

5 0
3 years ago
Helium is located in group 8A but does not have eight valence electrons. Why is it located in 8A, not 2A?
astraxan [27]

Answer:

its outermost shell is completely full making it extremely stable.

Explanation:

It only has two electrons in its outer shell so its valence electron configuration is 1s2. Even though it only has two electrons, it is grouped with elements that have eight valence electrons. Helium is still happy because its outermost shell is completely full making it extremely stable.

5 0
3 years ago
The temperature of a sample of gas at 8.5 atm and 59.2 °C increases to 140.0 °C. If the
labwork [276]

Answer:

since that's the closest option we have

10.6atm

Explanation:

Since volume is constant

P1/T1 = P2/T1

P1 =8.5atm

T1 = 59.2°C = 332.2k

T2 = 140°C = 413k

P2 = ?

8.5/332.2 = P2/413

0.026 = P2/413

P2 = 0.026 x 413

P2 = 10.74atm

5 0
3 years ago
Suppose that in a particular reaction 10.5 grams of HCl (36.5 g/mol) react with excess NaOH and 19.3 grams of NaCl (58.5 g/mol)
JulijaS [17]

Answer:

The answer to your question is 114.7% the percent is higher than expected.

Explanation:

Data

mass of HCl = 10.5 g

molar mass of HCl = 36.5 g

mass of NaOH = 19.3 g

molar mass of NaOH = 58.5

Process

1.- Write the balanced chemical reaction

                    HCl  +   NaOH   ⇒    NaCl  +  H₂O

2.- Calculate the theoretical yield

                    36.5 g of HCl -------------- 58.5 g of NaCl

                     10.5 g of HCl --------------  x

                     x = (10.5 x 58.5)/36.5

                     x = 16.83 g

3.- Calculate the percent yield

                     % yield = (19.3/16.83) x 100

                     % yield = 114.7

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3 years ago
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