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AVprozaik [17]
3 years ago
8

[50 Points] In the experiment below, Beaker 1 contains 12.0 M HCl. Each subsequent beaker is diluted by 50%. What is the [OH-] i

n Beaker 6?
Chemistry
1 answer:
Sidana [21]3 years ago
5 0

Answer:

2.67x10⁻¹⁴M = [OH-]

Explanation:

To solve this question we need first to find the HCl concentration of the beaker 6. Then, using:

Kw = [OH-][H+]

<em>Where Kw = 1x10⁻¹⁴</em>

<em>[OH-] is our incognite</em>

<em>[H+] is = [HCl]</em>

<em />

Beaker 2 = 12.0M / 2 = 6.0M

Beaker 3 = 6.0M / 2 = 3.0M

Beaker 4 = 3.0M / 2 = 1.5M

Beaker 5 = 1.5M / 2 = 0.75M

Beaker 6 = 0.75M / 2 = 0.375M

HCl = 0.375M = [H+]

1x10⁻¹⁴ / [H+] = [OH-]

1x10⁻¹⁴ / 0.375M = 2.67x10⁻¹⁴M

<h3>2.67x10⁻¹⁴M = [OH-]</h3>
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In a chemical reaction at equilibrium, the rate of the forward reaction is______ the rate of the reverse reaction. If the rate o
zmey [24]

Answer:

equals

Explanation:

<h3>it means that forward reaction equals to reverse reaction</h3>
6 0
3 years ago
What is the charge of an atom's nucleus of an atom has 20 protons, 23 neutrons, and 18 electrons?
Sidana [21]

Answer:

It would have a charge of +2.

Explanation:

A proton has a charge of +1, an elctron has a charge of -1, and a neutron has a charge of 0. Ignore the neurons since they have a charge of 0. Since there are 20 protons and 18 electrons (20-18), the overall charge of the atom is +2.

8 0
4 years ago
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1.What are 4 things that are increasing Earth's temperatures? 2. What are 4 things we can do to on a personal level to help?
VARVARA [1.3K]

Answer:

Hey there!

Four things increasing temperature:

Cars, Busses, Motorcycles

Greenhouse Gases

Factories

Non-renewable energy sources

Four things we can do:

Ride a bike instead of a car

Try using solar panels, and wind energy

Turn off lights when leaving a room

Try reusing and recycling.

Let me know if this helps :)

6 0
3 years ago
For which of the following reactions is S° &gt; 0.
lisabon 2012 [21]

The entropy of the given reactions increases (S° > 0):

  • 2C2H6(g) + 7O2(g) ----> 4CO2(g) + 6H2O(g) ---> S° > 0.
  • NH4Cl(s) ----> NH3(g) + HCl(g) ---> S° > 0.

<h3>What is entropy?</h3>

Entropy measure how disordered a system is. It a measure of how dispersed or random the total energy of a system is. The symbol for entropy is S.

A system in which entropy increases is one in which S° > 0.

The entropy of a system decreases when S° < 0.

Entropy of a system increases (S° > 0) if any change results in an increase in temperature, increase in number of molecules, or an increase in volume.

Considering the given systems, the entropy changes is as follows:

  • 2C2H6(g) + 7O2(g) ----> 4CO2(g) + 6H2O(g) ---> S° > 0.
  • 2CO2(g) + N2(g) ---->2CO(g) + 2NO(g) --> no change
  • 2N2(g) + O2(g) -----> 2N2O(g)  ---> decreases
  • S (s,rhombic) + 2CO(g) ----> SO2(g) + 2C (s,graphite) ---> no change
  • NH4Cl(s) ----> NH3(g) + HCl(g) ---> S° > 0.

In conclusion, an increase in volume and moles of substances results in entropy increase.

Learn more about entropy at: brainly.com/question/26691503

#SPJ1

8 0
2 years ago
Which of the following forms a new substance? melting, evaporating, freezing or burning
Slav-nsk [51]
It would be burning be cause when you freeze, evaporate, or melt anything it is just changing how fast the atoms are moving . Think of it like water, ice, and steam, they are all the same thing but in different forms because of melting, evaporating,and melting. Burning is breaking it down.
4 0
4 years ago
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