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Ronch [10]
3 years ago
8

Which represents the greatest time frame in which a short-term environmental change can occur? A)in days. B)in minutes. C)over h

undreds of years. D)over thousands of years.
Chemistry
1 answer:
dangina [55]3 years ago
5 0

Answer:

Over hundreds of years

Explanation:

Just did the test and got it right

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The pH of a saturated solution of a metal hydroxide MOH is 10.15. Calculate the Ksp for this compound.
Airida [17]

Answer:

Ksp=2.00x10^{-8}

Explanation:

Hello!

In this case, since the pH of the given metal is 10.15, we can compute the pOH as shown below:

pOH=14-pH=14-10.15=3.85

Now, we compute the concentration of hydroxyl ions in solution:

[OH^-]=10^{-pOH}=10^{-3.95}=1.41x10^{-4}M

Now, since this hydroxide has the form MOH, we infer the concentration of OH- equals the concentration of M^+ at equilibrium, assuming the following ionization reaction:

MOH(s)\rightarrow M^+(aq)+OH^-(aq)

Whose equilibrium expression is:

Ksp=[M^+][OH^-]

Therefore, the Ksp for the saturated solution turns out:

Ksp=1.41x10^{-4}*1.41x10^{-4}\\\\Ksp=2.00x10^{-8}

Best regards!

4 0
2 years ago
Which of the following elements is going to be the most reactive and why? Nitrogen or Oxygen?
bagirrra123 [75]

Answer:

(C) Oxygen because it has the strongest attractive force and the largest

electronegativity

Explanation:

Oxygen will be most reactive

configuration = 1s^22s^22p^4

As oxygen need only two electrons to complete its octet.

Oxygen will have stronger force than nitrogen as it will tend to pull electrons more to complete its octet. Also along the period electronegativity increases so oxygen has higher electronegativity than nitrogen

7 0
3 years ago
SEP Analyze Data Look at the phase diagram. What is the state of matter for methanol at a temperature of −0.1°C and a pressure o
devlian [24]
If it’s a negative number and a positive it might be 1.4
8 0
2 years ago
Can someone explain this to me, please?
zimovet [89]

Answer:

Isotopes have same atomic numbers, no. of protons and no. of electrons. Only their no. of neutrons and atomic mass are changed.

<u>Na - 24:</u>

Atomic Mass = 24

Atomic No. = 11

Hence,

No. of protons in Na-24 = 11

No. of neutrons = Atomic Mass - Atomic Number

No. of neutrons = 24 - 11

No. of neutrons = 13

Atomic Number = 11

\rule[225]{225}{2}

Hope this helped!

<h3>~AH1807</h3><h3>Peace!</h3>
5 0
2 years ago
“Sound plays an important role in our lives”. Give two points in support of this statement.
masha68 [24]
Sound can be used to alert us in emergencies. 2. Sound can also be used to help blind people navigate the world better. I’m sorry if these horrible but I tried lol
3 0
3 years ago
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