The atomic mass of an element is calculated using its masses and the ratios of its naturally occurring isotopes. The answer is number 3. The rest of the choices do not answer the question above.
Answer:
#3
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(2) a solution (4) an isomer
A sample composed only of atoms having the same atomic number is classified as " element".
A pure substance made up entirely of atoms with almost the same number of protons in respective nuclei was known as an element.
Atoms are "the fundamental building components of matter," according to Wikipedia. It is the lowest fundamental unit of matter which thus possesses chemical element qualities.
A sample composed only of atoms having the same atomic number is classified as " element".
Therefore, the correct answer will be option (3).
To know more about atom and element.
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2H2O2 → 2H2O + O2
CaCO3 → CaO + CO2
2AgNO3 + Zn → 2Ag + Zn(NO3)2
Answer: The correct answer is
Explanation:
Synthesis reaction is defined as the reaction in which two smaller substances combine together to form a large single compound.
From the given options:
Option A:
This is a synthesis reaction and only one product is forming.
Option B:
This is a decomposition reaction.
Option C:
This is a decomposition reaction.
Option D:
This is a single displacement reaction.
Thus, the correct answer is
A synthesis reaction is a chemical reaction in which two or more substances combine to form a single, more complex substance. The correct synthesis reaction from the given options is 2H2 + O2 → 2H2O.
A synthesis reaction is a chemical reaction in which two or more substances combine to form a single, more complex substance.
In the given options:
Therefore, the correct answer is
2H2 + O2 → 2H2O
.
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Answer:
10.81 amu
Explanation:
The average atomic mass of Boron can be calculated as follows :
So, the average atomic mass of boron is 10.81 amu.