CHEMISTRY HIGH SCHOOL

What is the mass number of isotopes of tin that has 66 neutrons and 50 protons
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Answers

Answer 1
Answer:

Answer:

116

Explanation:

neutrons = mass number - proton number

66 = mass number - 50

add 50 on both sides

66 + 50 = 116

so the mass number is 116

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Which substance is an Arrhenius acid?
(1) LiF(aq) (3) Mg(OH)2(aq)
(2) HBr(aq) (4) CH3CHO

Answers

Answer: Option (2) is the correct answer.

Explanation:

Arrhenius acid are the species that donate a H^(+) ion or proton.

For example, HBr \rightarrow H^(+) + Br^(-)

Whereas LiF, Mg(OH)_(2), and CH_(3)CHO are the substances which do not give a proton upon dissociation. Hence, they are not Arrhenius acids.

Therefore, we can conclude that HBr(aq) substance is an Arrhenius acid.
HBr (aq) is an Arrhenius acid.
The equation is HBr(aq) -> H+ + Br- 

All radioactive nuclides undergo what

Answers

They undergo nuclear fission.

Which of the following an inorganic compound?CH3(CH2)3CH3 pentane
C6H12O6 glucose
C4H10 butane
H2O water molecule

Answers

An organic compound is one which consists of a chain of carbon atoms with other atoms bonded to the chain.

Pentane has 5 carbon atoms with surrounding hydrogens.
glucose is a chain of 6 carbon atoms
butane is similar to pentane

water has no carbon atoms, and the central atom is oxygen ---> therefore it is inorganic!

What information does a food label tell a consumer about the food that they are going to eat?

Answers

Explains to them the ingredients, the amount of protein, fat, etc, how much of that they would be getting pair or to how many servings.   

How is an average mass different from a weighted average mass?

Answers

The weighted average mass of the atoms in a naturally occurring sample of an element is the average atomic mass, also known as atomic weight.

What is atomic mass?

The average mass of an element's atoms expressed in atomic mass units is known as its atomic mass (amu, also known as daltons, D).

The mass of each isotope is multiplied by its abundance to produce the atomic mass, which is a weighted average of all the isotopes of that element.

Any element has a variety of isotopes, thus to take into consideration the fact that each isotope has a different mass, a weighted average mass is used.

A weighted average takes into account the potential that an element's average mass, as calculated from a random sample, will most likely coincide with the average mass of its more common isotopes.

The weighted average masswill therefore be closest to that of the more prevalent isotopes.

To learn more about Atomic mass, refer to the below link:

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With any element, there are a range of isotopes . . . a weighted average mass is used because there exist different isotopes of that element, each of varying mass.  A weighted average accounts for the fact that the average mass (that may likely be measured from a random sample of the element) will most likely reflect the average mass of the more abundant isotopes.  So the weighted average mass will be most comparable to the more abundant isotopes.

What is first and second element of the periodic table?

Answers

The elements on the periodic table are listed in increasing atomic number. 

Hydrogen is the first element, and has an A.N. of 1. Also, its very interesting how it doesn't need 8 valence electrons to be stable. 

The second element is Helium, which has an A.N (atomic number) of two. 

The first element of the periodic table is hydrogen (H), and the second element is helium (He).

Hydrogen, with atomic number 1, is the first element in the periodic table. It is the lightest and the most abundant element in universe. Hydrogen is a colorless, odorless gas and is the building block for all other elements.

Helium, with atomic number 2, is the second element in the periodic table. It is also a gas, but unlike hydrogen, it is inert and does not readily react with other elements. Helium is known for its low density, which makes it lighter than air, and it is commonly used for filling balloons and as a cooling medium in various scientific and industrial applications.

So, the first element of the periodic table is hydrogen (H), and the second element is helium (He).

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