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4 years ago

8. Which of the following would not increase the rate of most reactions?

2 answers:

8 0

I believe the correct answer would be letter C: removing an inhibitor. First of all, a catalyst increases the rate of reactions. Also, increasing temperature causes more reaction because molecules are more active this way. Lastly, lowering the concentration of the reactants will not increase the rate of reactions because again, high concentration causes collision..

3241004551 [841]4 years ago

5 0

A few factors influence the rate of reaction, including :

Temperature. Most reactions increase in rate as temperature increases; most reactions slow down as temperature decreases.

Concentrations of the reactant. Raising the concentration of a substance will increase the speed of the reaction; lowering the concentration of a substance will decrease the speed of the reaction. The limiting reactant is the reactant that is completely used up in a reaction. When this is completely used up, the reaction will stop.

Catalysts. These are substances that speed up the rate of the reaction by lowering the activation energy. If a catalyst is added, the rate of reactions will increase. If a catalyst is removed, the rate of reactions will decrease. Enzymes are biological catalysts used in living things to speed up internal reactions.

Inhibitors. These are substances that slow down the rate of a reaction. If an inhibitor is added to a reaction, its rate will decrease. If an inhibitor is removed from a reaction, its rate will increase.

Thus, the right answer is B. Lowering the concentration of the reactants

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What word or two-word phrase best describes the shape of the fluoroform molecule?

Vlad [161]

Answer : The shape of the fluoroform molecule is Tetrahedral.

Explanation :

First we have to calculate the Hybridization of the molecule by formula,

$\text{Number of electrons} = \frac{1}{2}[V+H-C+A]$

where,

V = Number of valence shell electron in central atom

H = Number of neighboring monovalent atom

C = charge of cation

A = charge of anion

The central atom in this molecule is Carbon, it has 4 electrons in their valence shell.

The neighboring monovalent atoms are one Hydrogen atom and three Fluorine atom.

There is no charge of cation and anion on the given molecule.

V = 4

H = 1 Hydrogen atom + 3 fluorine atom = 4

C = 0

A = 0

By the above hybridization formula, we get

$\text{Number of electrons}= \frac{1}{2}[4+4-0+0]$ = 4

The number of electron pair = 4

The number of lone pair = 0

The number of electrons is 4, this means that the hybridization is $sp^{3}$ and the geometry of the molecule is Tetrahedral.

The geometry of the molecule is shown below.

3 0

3 years ago

Balance the following equation by inspection: Cu + HNO3 --> Cu(NO3)2 + H2O +NO

pashok25 [27]

Answer:

f is this

Explanation:

7 0

4 years ago

Read 2 more answers

How do we know that caramelizing sugar is a chemical change ?

Katyanochek1 [597]

Chemical transformation: it's all transformation changes the composition of matter, i.e. that matter produces a new substance with different initial properties burning sugar to make caramel, we cannot retrieve the initial sugar.

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4 0

4 years ago

HELP PLEASE What makes up most of an atom's volume, and where is it located?

scoray [572]

Answer:Accounting for the sizes of protons, neutrons, and electrons, most of the volume of an atom—greater than 99 percent—is, in fact, empty space. ... The electrons that surround all atoms are negatively charged and cause atoms to repel one another, preventing atoms from occupying the same space.

Explanation: hope this helped

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3 years ago

I need help on this

sasho [114]

Answer: Y and Z. It's D.

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3 0

3 years ago