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Ipatiy [6.2K]
2 years ago
15

Correct way for calculating atomic mass

Chemistry
1 answer:
kolezko [41]2 years ago
5 0

Answer:

mass number = protons + neutrons.

Explanation:

Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number.

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If 3.64g of sand is separated from 5.25g of a mixture of salt and sand what is the percentage of sand in the sample
Mashcka [7]
Total weight of the mixture of sand and salt = 5.25 g
Weight of sand separated = 3.64 g
Weight of the salt in the mixture = (5.25 - 3.64) g
                                                   = 1.61 g
Then the percentage of sand in the sample = [(3.64/5.25) * 100] percent
                                                                      = 69.33%
So the percentage of sand in the total mixture of sand and salt is 69.33%.
7 0
3 years ago
A displacement reaction takes place when calcium is placed in a solution of zinc chloride. Which substances will most likely be
Karolina [17]

Hi!


The correct option would be A.


This is because the displacement reaction would take place as follows

Ca + ZnCl2 --> CaCl2 + Zn


A displacement reaction is one in which a substitution occurs, as the more reactive element in the mixture replaces one that is less reactive.

In the electrochemical series, we find Ca higher than Zn, which is indicative of Ca being more reactive, and having the capacity to displace Zn to form a compound.


Option D would be incorrect as no such substitution occurs.

Option B would be incorrect because again, there is no substitution occurring, and also because two metals alone (Ca and Zn in our case) can never react to form a compound.

Option C would be incorrect because it is not possible because CaCl and ZnCl are forms that are too unstable to exist due to an overall positive charge.


Hope this helps!

5 0
3 years ago
What is an energy conserved system ?
grin007 [14]

Answer: In physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time. For instance, chemical energy is converted to kinetic energy when a stick of dynamite explodes.

Explanation:

internet

6 0
3 years ago
Is frying an egg chemical or physical change
max2010maxim [7]

It is a chemical change

3 0
3 years ago
Read 2 more answers
2. Which of the following does not have a nucleus? a. prokaryotes b. eukaryotes c. prokaryotes and eukaryotes ​
qwelly [4]

Answer:

Erythrocytes

Erythrocytes do not contain a nucleus. This would make answer choice "A" correct. Erythrocytes are red blood cells and these cells differ from the other cells of the body because of the absence of the nucleus. All the other cells noted have nuclei.

Explanation:

Have A Wonderful Day !!

3 0
3 years ago
Read 2 more answers
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