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3 years ago

What is a star's absolute brightness? pls help

Chemistry

1 answer:

Zanzabum3 years ago

4 0

Answer:

<h3>absolute brightness: The apparent brightness a star would have if it were placed at a standard distance of 10 parsecs from Earth.</h3>

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Why must oxidation be accompanied by a reduction?

Crazy boy [7]

Answer:

Explanation:

because the species being oxidized shares electrons with the species that is reduced.making the oxidized element positively charged and the reduced element negatively charged.

I hope this helps

5 0

3 years ago

Read 2 more answers

Which element would you expect to be more metallic?<br> (a) S or Cl (b) In or Al (c) As or Br

Natalija [7]

Explanation:

When we move across a period from left to right then there will occur an increase in electronegativity and also there will occur an increase in non-metallic character of the elements.

As sulfur (S) is a group 16 element and chlorine (Cl) is a group 17 element. Hence, sulfur (S) is more metallic in nature than chlorine.

This means that chlorine (S) is less metallic than chlorine (Cl).

Both indium (I) and aluminium (Al) are group 13 elements. And, when we move down a group then there occur an increase in non-metallic character of the elements. As indium belongs to group 13 and period 5 whereas aluminium belongs to group 13 and period 3.

Therefore, aluminium (Al) is more metallic than indium (In).

Arsenic (Ar) is a group 15 element and bromine (Br) is a group 17 element. Therefore, arsenic is more metallic than bromine.

4 0

4 years ago

What are the coefficients that would balance this equation? ___ HCL+___ NaOH-___ NaCl+____ H20

nexus9112 [7]

Answer:

It's already balanced as the equation has the same number of atoms on both left and right side

8 0

2 years ago

What does the molar mass of an element represent?

zysi [14]

The molar mass of an element represents how many grams of that specific element are in one mole of that specific element

5 0

3 years ago

An atom of 105In has a mass of 104.914558 amu. Calculate the binding energy in MeV per NUCLEON. Enter your answer with 3 signifi

joja [24]

Answer:

8.46

Explanation:

Atomic number : It is defined as the number of electrons or number of protons present in a neutral atom.

Also, atomic number of I = 549

Thus, the number of protons = 49

Mass number is the number of the entities present in the nucleus which is the equal to the sum of the number of protons and electrons.

Mass number = Number of protons + Number of neutrons

105 = 49 + Number of neutrons

Number of neutrons = 56

Mass of neutron = 1.008665 amu

Mass of proton = 1.007825 amu

Calculated mass = Number of protons*Mass of proton + Number of neutrons*Mass of neutron

Thus,

Calculated mass = (49*1.007825 + 56*1.008665) amu = 105.868665 amu

Mass defect = Δm = |105.868665 - 104.914558| amu = 0.954107 amu

The conversion of amu to MeV is shown below as:-

1 amu = 931.5 MeV

<u>So, Energy = 0.954107*931.5 MeV/atom = 888.750671 MeV/atom</u>

Also, 1 atom has 105 nucleons (Protons+neutrons)

<u>So, Energy = 888.750671 MeV/105nucleons = 8.46 MeV/nucleon</u>

<u>Answer:- 8.46</u>

8 0

3 years ago

What is a star's absolute brightness? pls help​

What is a star's absolute brightness? pls help