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lina2011 [118]
2 years ago
5

A star is mainly made of hydrogen gas, but most classes of stars include other elements such as helium, calcium, and other heavi

er elements and molecules.
Group of answer choices

True

False
Chemistry
2 answers:
Xelga [282]2 years ago
6 0
That would be true, since most other stats include helium, calcium, etc
Sidana [21]2 years ago
4 0
The answer is true! :)
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For all of the following questions 20.00 mL of 0.200 M HBr is titrated with 0.200 M KOH.
HACTEHA [7]

Answer :

The concentration of H^+ before any titrant added to our starting material is 0.200 M.

The pH based on this H^+ ion concentration is 0.698

Explanation :

First we have to calculate the concentration of H^+ before any titrant is added to our starting material.

As we are given:

Concentration of HBr = 0.200 M

As we know that the HBr is a strong acid that dissociates complete to give hydrogen ion H^+ and bromide ion Br^-.

As, 1 M of HBr dissociates to give 1 M of H^+

So, 0.200 M of HBr dissociates to give 0.200 M of H^+

Thus, the concentration of H^+ before any titrant added to our starting material is 0.200 M.

Now we have to calculate the pH based on this H^+ ion concentration.

pH : It is defined as the negative logarithm of hydrogen ion concentration.

pH=-\log [H^+]

pH=-\log (0.200)

pH=0.698

Thus, the pH based on this H^+ ion concentration is 0.698

3 0
3 years ago
Would it be D....????<br> HELPPPPPP
AlekseyPX

Answer:

yes

Explanation:

6 0
3 years ago
How many hydrogen atoms in the following chemical formula ? <br> NH4OH
djyliett [7]

Answer:

5

Explanation:

NH4OH

The subscript gives the info that there are 4 hydrogen atoms but there is another H in the formula so you add them up.

5 0
3 years ago
Does the PROCESS of crude oil distillation have environmental impacts?<br> Please answer ASAP
olga55 [171]

Accidental fires, explosions, and chemical and gas leaks are common at refineries. Such accidents cause higher than usual amounts of pollution, which may result in more acute exposure to pollutants and greater health impacts.

5 0
2 years ago
Hi. I need help with this
Vlad1618 [11]

Factors that determine ionization energy:

  • Electronic Repulsion - If the electronic density decreases, the ionization energy with increase and vice versa. If an electron gets released, it decreases the electronic repulsion. This makes releasing another electron harder than the first on unless the electron that is being released comes from another energetic level.
  • # Of Energy Levels - The more energy cores that get filled up, the more ionization levels decrease. When we see the energy levels go from top to bottom, the ionization also go from most to least. This is why ionization occurs on the highest level.
  • Nuclear Charge - The higher the atomic number, the higher charge in the nuclei. This also makes the ionization energy higher as it increases from left to right of in other words, if the nuclear charge gets higer, the energy gets higher as well.

Factors that determine atomic volume:

  • How many protons are in the nucleus (nuclear charge)
  • How many energy levels carry electrons (electrons in outer energy level)

Best of Luck!

4 0
3 years ago
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