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Vladimir79 [104]
3 years ago
13

What gives an atom its mass?

Chemistry
1 answer:
saw5 [17]3 years ago
4 0
Almost all of the mass of an atom (more than 99%) is in its nucleus, so "atomic mass" is pretty much a measure of the size of the nucleus of an atom. The nucleus of an atom is made up of protons and neutrons. Protons and neutrons are almost exactly the same size.
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A buffer solution is made using a weak acid, HA. If the pH of the buffer is 9 and the ratio of A– to HA is 100, what is the pKa
sdas [7]
To calculate the pKa of the weak acid, we use the Henderson-Hasselbalch equation. It is expressed as pH = pKa - log [HA]/[A-]. This equation takes into account the concentration of the substance that does not dissociates into ions since it is a weak acid. We caculate as follows:

pH = pKa - log [HA]/[A-]
9 = pKa - log 1/100
pKa = 7
3 0
3 years ago
Probability is a number that describes how likely it is that a certain event will occu O True O False​
lara31 [8.8K]

Answer:

Between 0 and 1

Explanation:

Hope this helps :)

6 0
3 years ago
How many times do u have to run back and forth across a football field to be meter
Taya2010 [7]
You would have to run 100 kilometers across it once. Then you will have to run 10 meters across it because a football field is 110 meters according to the NFL’s website
7 0
3 years ago
Compared to the nucleus 5626fe, what is the density of the nucleus 112 48cd?
tia_tia [17]

For a comparison of the nucleus 5626fe, the density of the nucleus 112 48cd is mathematically given as the same.

n(Cd) / n(Fe)=1

<h3>What is the density of the nucleus 112 48cd?</h3>

Generally, the equation for the density  is mathematically given as

d=\frac{A}{4/3}\piR^3

Therefore

n(Cd) / n(Fe) = [A (Cd) / (A Fe) ] * [ R (Fe) / R (Cd)]^3

n(Cd) / n(Fe)= (112 / 56 ) * (1/1.26)3

n(Cd) / n(Fe)=1

In conclusion, The ratio of n(Cd) = n(Fe) is 1, hence same

Read more about density

brainly.com/question/14010194

8 0
2 years ago
CO2<br> +<br> NaOH<br> &lt;=&gt;<br> NaHCO3<br> Balance
NeTakaya

Answer:

Explanation:

It is balaned

Left side

1 Na

1 C

3 Os

1 H

=========

Right side

1 Na

1 H

1 C

3 Os

5 0
3 years ago
Read 2 more answers
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