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Chemistry 4th Q > 2020 Mod 15 > Flashcards

2020 Mod 15 Flashcards

1
Q

Chemical equilibrium

A

The point at which both the forward and reverse reaction in a chemical equation have equal reaction rates. When this occurs, the amount of each substance in a chemical reaction will not change, despite the fact that both the reactions still proceed

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2
Q

When I chemical reaction begins, is the rate of the forward and reverse reactions equal? Wednesday reach equilibrium how long will they stay there

A

No.

They will stay there forever until disturbed by some outside intervention

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3
Q

What does the K in equation 15.1 equals?

A

The capital K stands for the equilibrium constant

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4
Q

What kind of concentrations can be used to calculate K or the equilibrium constant

A

Only concentrations at equilibrium can be used to calculate K

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5
Q

Are all chemical reactions equilibrium reactions

A

Yes

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6
Q

When a solid appears in a chemical equilibrium is it included in the equation 15.1? Finding K

A

No

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7
Q

When a liquid appears in the care of a question do we included in the equation 15.1 finding K?

A

No

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8
Q

When an aqueous face appears in the chemical equation of equilibrium do we included in equation 15.1 finding K?

A

Yes

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9
Q

What is Le Châtetier’s principal

A

It is when a stress (Such as a change in concentration, pressure, or temperature),The reaction will shift in a way that relieves the stress and restores equilibrium

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10
Q

What phasers does Le Châtetier’s principal ignore As sources of stress to the equilibrium?

A

Le Châtetier’s principal Ignores solid and liquid as a source of stress to the equilibrium

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11
Q

What happens when an equilibrium is subjected to an increase in pressure?

A

The reaction will shift away from the side with the largest number of gas molecules.

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12
Q

What will happen to an equilibrium when it is subject to a decrease of pressure

A

The equilibrium will shift towards the side with the largest number of gas molecules

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13
Q

What would happen if there are no gas is in an equation or if the gas molecules are the same on both sides and we adjust the pressure?

A

Nothing will happen

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14
Q

What will happen to an equilibrium if the temperature is raised

A

The equilibrium will shift away from the side of the equation that contains energy

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15
Q

What happens when the temperature is lowered in an equilibrium reaction

A

The reaction will shift towards the side that contains energy

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16
Q

Acid ionization reaction

A

The reaction in which an H positive I am separate from an acid molecule so that it can we donate to another reaction

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17
Q

Acid ionization constant

What is it abbreviated as?

A

The equilibrium constant for an acid ionization reaction

It is usually abbreviated as Ka

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18
Q

If the ionization constant of an acid is large, is the acid considered strong or weak?

A

Strong

19
Q

If the ionization constant is not large, is the acid considered strong or weak?

A

Weak

20
Q

Finish the phrase

In general the larger the Ionization constant—

A

The stronger the acid

21
Q

What is the name of the special scale that helps us classify acid and bases?

A

The pH scale

22
Q

What are solution with a pH of 0 to 1.9 considered?

A

They are considered strongly acidic

23
Q

What are solutions with a pH of 2 to 6.9 considered

A

They are weekly acidic

24
Q

What are solution with a pH of 7.1 to 12 considered?

A

Weekly basic

25
Q

What our solution with a pH of 12.1 to 14 considered?

A

They are considered strongly basic

26
Q

What does a pH of seven indicate in a solution

A

A neutral solution

27
Q

How did we define acids

A

Acids are any molecule that donates an H positive Ion

28
Q

How did we do find a base?

A

A basic any Molecule that excepts H positive Ion

29
Q

What is the definition of a chemical equilibrium

A

It is win both the forward yeah action and the reverse reaction have the same rate

30
Q

Does a chemical reaction actually stopped once equilibrium is reached?

A

No

31
Q

A chemist is studying two equilibria. Reaction a has an equilibrium constant equal to 1213 M, while reaction be has an equilibrium constant equal to 0.344 M squared. Which reaction will make more products?

A

The first

32
Q

After taking a cursory glance through a chemistry book a student says it’s sometimes a chemical reaction is written with a single arrow and sometimes is written with a double arrow. The student says that this means some chemical reactions are equal Librium and summer not. What is wrong with the student statement?

A

All chemical reactions are equilibrium. However some reactants become so small that they can be ignored

33
Q

Why do you ignore sought in the equilibrium constant when using Le Châtetier’s principal ?

A

Solids do not change their concentration in any chemical reaction

34
Q

Why are acid Ionization reactions important in chemistry

A

Because they determine the strength of an acid

35
Q

What are the limits of the pH scale?

A

The range is 0 to 14

36
Q

Three solutions have the following pH levels which is/are the acidic solutions

A one

B 10

C 7

A

Yes, no, no

37
Q

Three acid solutions of equal concentration have the following pH levels
Solution a: PH equals one
Solution be: PH equals four
Solution C: PH equals six
Which solution is made with the acid that I have the lowest ionization constant

A

Solution C

38
Q

Where does acid rain come from

A

Acid rain is an excess of pollutants reacting in rainwater some pollutants include sulfur trioxide and nitrogen dioxide

39
Q

If a problem gives you the correct equilibrium constant and the one you calculate is smaller then the the correct equilibrium which way will the reaction shift to make equilibrium happen

A

Direction missed shift towards the products

40
Q

If a problem gives you the correct equilibrium constant and the one you calculate is larger then the the correct equilibrium which way will the reaction shift to make equilibrium happen

A

The reaction must shift towards the reactants

41
Q

If energy is less than zero The reaction is

A

Exothermic making energy a product

42
Q

In Equation 15.1 where do the reactants go and where do the products go

A

Products over reactants

43
Q

When an equilibrium constant is very small are Reactance what products more present?

A

Reactance

44
Q

When equilibrium constant are very large are reacting or product more present

A

Products

Chemistry 4th Q (4 decks)

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