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sergij07 [2.7K]
3 years ago
6

Please helpp me i really need help​

Chemistry
2 answers:
Monica [59]3 years ago
6 0
5 minutes. 2 degree change
10 minutes. 5 degree change
20 minutes. 8 degree change
vagabundo [1.1K]3 years ago
4 0

Answer:

second box is 2 C, third box is 3 C, and the last box is 3 C.

Explanation:

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If and acid has a Ka dissociation constant of 1 x 10-9 what is the pKa of this acid?
Sphinxa [80]

Answer:

pKa = 9

Explanation:

In this case, we have to remember the meaning of "p". When we use "p" in any calculation we have to apply the minus ten based logarithm, so:

p~=~-Log

For example, when we use the "pH" value. We have to apply the minus ten based logarithm of the concentration of the hydronium ion:

pH~=~-Log[H^+]

So, if we have wanted to calculate the pKa value. We have to apply the minus ten based logarithm of the Ka value, so:

pKa~=~-Log~Ka

Now we can plug the value into the equation:

pKa~=~-Log~1x10^-^9

pKa~=~9

<u>The pKa value is 9.</u>

I hope it helps!

7 0
3 years ago
Which formulas represent compounds?
Nimfa-mama [501]

The answer will be B

6 0
3 years ago
Read 2 more answers
If 5400. Joules of energy were supplied to 4.5 grams of ice at -10 degree Celsius, how many grams of what phases would you have?
devlian [24]
The answers to you questions are 3,66 g of liquid water and 0,84 g of vapor.
Solution:1) Q₁ = mxCxΔT = 4,5 g x 2,108 J/°C x g x 10°C.
 = 97,86 J heat required to warm the ice to 0°C.

2) = 4,5 g x 334 J/g. = 1503 J heat required to melt the ice to water at 0°C.

3)  = 4,5 g  x 4,184 J/°C x g x 100°C
 = 1882,28 J heat required to warm the water from 0°C to 100°C. = 5400 J - 3483,14 J = 1916,86 J heat left to vaporize the water.

mass of the vapor= 1916,86 J ÷ 2257 J/g
= 0,84 g.
3 0
3 years ago
Read 2 more answers
Where are electrons in an atom located? moving outside the nucleus inside the nucleus attached to neutrons
KengaRu [80]
The electrons are located near the nucleus on the outside
8 0
3 years ago
Chemistry
Vadim26 [7]

Answer:

oxidizer: one used to support the combustion of a rocket propellant

word: a single distinct meaningful element of speech or writing

Explanation:

6 0
3 years ago
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