Which of the following best explains why the atomic mass is a fraction between 72 and 73? Options: A. The atomic mass is the weighted average of all the naturally occurring isotopes of the element. B. The atomic mass is determined by the number of protons in the nucleus. C. The atomic mass is a whole number, but it appears as a fraction due to rounding in the periodic table. D. The atomic mass is a decimal number because it represents the total number of electrons in the atom.

Answers

Answer 1

Answer:

Answer:

The atomic mass is the weighted average of all the naturally occurring isotopes of the element.

Explanation:

A. The atomic mass is the weighted average of all the naturally occurring isotopes of the element. YES. Since there can be several different isotopes of the same element, the weighted average is used in the periodic table to reflect the likely composition of a random sample.

B. The atomic mass is determined by the number of protons in the nucleus. NO

C. The atomic mass is a whole number, but it appears as a fraction due to rounding in the periodic table. NO.

D. The atomic mass is a decimal number because it represents the total number of electrons in the atom. NO.

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How do you balance __H2SO4 + __B(OH)3 --> __B2(SO4)3 + __H2O

Answers

$B(OH)_3=H_3BO_3$

then

$H_2SO_4+H_3BO_3\longrightarrow~B_2(SO_4)_3+H_2O$

$\boxed{3H_2SO_4+2H_3BO_3\longrightarrow~B_2(SO_4)_3+6H_2O}$

What are signs that a chemical reaction has accrued

Answers

Answer:

Burns, rashes, types of sickness, etc

Explanation:

(Change in color,change in odor,formation of precipitation )hope this helps

What part of earth is a solid composed of iron and nickel?

Answers

its of-course the inner core

Technician A says that a leaking head gasket can be tested for by using a chemical tester. Technician B says that a leaking head gasket can be found using an exhaust gas analyzer. Who is correct?

Answers

Answer: Both technicians are correct

Explanation: A chemical tester and exhaust gas analyzer are two important ways to check for gasket leakage

What is the total number of valence electrons in an atom of germanium in the ground state?(1) 8 (3) 14
(2) 2 (4) 4

Answers

The answer is (4) 4. Germanium is a main group element in group 4A. Therefore, like carbon, it has 4 valence electrons in the ground state.

Glycerol boils at a higher temperature than water. What does this indicate about the attractive forces of glycerol?

Answers

The chemical formula for glycerol is HOCH2-CH(OH)-CH2OH while that of water is H-OH. The intermolecular forces in both water and glycerol are the strong H-bonds. However, since there are 3 OH groups/ glycerol molecule vs the one -OH group in water enables glycerol to form more H-bonds when compared to water.

The stronger attractive forces in glycerol causes an increase in its boiling point.

Answer: Glycerol has more attractive forces as compared to water.

Explanation:

Boiling point is the temperature at which vapor pressure of the liquid becomes equal to atmospheric pressure.

Boiling point depends on the strength of inter molecular forces.

The molecules of glycerol $(HOCH_2CH(OH)CH_2OH)$ are more strongly bonded through hydrogen bonds as there are three OH groups.

But in water $(H_2O)$ , only on e OH group is present and thus extent of hydrogen bonding is less.

Thus we can conclude that glycerol has more attractive forces as compared to water.

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