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inysia [295]
3 years ago
8

Catalysts increase reaction rates by lowering the activation energy of a reaction.

Chemistry
2 answers:
Zielflug [23.3K]3 years ago
8 0
That is 100% correct it is A!!!!
Hoped that helped u!
:D
Setler [38]3 years ago
4 0
The answer is true, catalysts increase rates by lowering the activation energy of a reaction. Catalysts lower the reaction energy and so the reaction occurs faster. Enzymes perform the role of biological catalysts. Most metabolic pathways of the body are controlled by enzymes. Enzymes by classification are proteins. <span />
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Naturally occurring silicon has an atomic mass of 28.086 and consists of three isotopes. The major isotope is 28Si, natural abun
Elden [556K]

Answer:

29Si has a natural abundance of 4.68%.

30Si has a relative atomic mass of 29.99288 and a natural abundance of 3.09%.

Explanation:

The atomic mass of silicon is given by:

Si=Si²⁸×A₁+Si²⁹×A₂+Si³⁰×A₃

Where:

Si: atomic mass of silicon (28.086)

Si²⁸: relative atomic mass of 28Si (27.97693)

A₁: natural abundance of 28Si (92.23%)

Si²⁹: relative atomic mass of 29Si (28.97649)

A₂: natural abundance of 29Si

Si³⁰: relative atomic mass of 30Si

A₃: natural abundance of 30Si

We also know that 30Si natural abundance is in the ratio of 0.6592 to that of 29Si.

We have to set up a system of three equations in three unknowns:

Si=Si²⁸×A₁+Si²⁹×A₂+Si³⁰×A₃

A₃=0.6592×A₂

A₁+A₂+A₃=1

First, we find substitute the value of A₃ in the third equation and solv teh value of A₂:

A₁+A₂+0.6592×A₂=1

A₁+1.6592×A₂=1

1.6592×A₂=1-A₁

A₂=\frac{1-A₁}{1.6592}=\frac{1-0.9223}{1.6592}=0.0468

Then, we find the value of A₃:

A₃=0.6592×A₂

A₃=0.6592×0.0468=0.0309

Finally, we find the value of Si³⁰ in the first equation:

Si=Si²⁸×A₁+Si²⁹×A₂+Si³⁰×A₃

28.086=27.97693×0.9223+28.97649×0.0468+Si³⁰×0.0309

28.086=27.15922+Si³⁰×0.0309

28.086-27.15922=Si³⁰×0.0309

\frac{0.92678}{0.0309}=Si³⁰

Si³⁰=29.99288

8 0
3 years ago
A physical change is a change to a sample of matter in which -
Readme [11.4K]

Answer:

its FALSE

Explanation:

FAKE   ITS NOT REAL

8 0
3 years ago
How far will an object move in 12 seconds if it is traveling at a velocity of 8 m/s?
xxMikexx [17]

Answer:

96 m/s.

Explanation:

Distance equals speed x time,

12 x 8, so the distance is 96 m/s.

5 0
3 years ago
Is potassium iodide an electrolyte or nonelectrolyte?
Lera25 [3.4K]
Its a strong electrolyte!.
6 0
3 years ago
What is the "goal" of an element in bonding chemically (what does it need to do to be stable)
svetoff [14.1K]
An element bonds chemically to fill it's outer valence electron shell, when that occurs it becomes stable.
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