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Elan Coil [88]
3 years ago
7

If a star is massive, it will remain in the main sequence _____ a smaller star.

Chemistry
2 answers:
Andrews [41]3 years ago
7 0
The correct answer is less time. If a star is massive, it will certainly remain in the sequence less time a smaller star. The most visible massive star that is also the nearest one on Earth is the Sun. Some stars can be visible to the naked eye during at night.
ahrayia [7]3 years ago
6 0

Answer:

A massive star will remain in the main sequence for a shorter period of time in comparison to a smaller star

Explanation:

A larger and massive star usually remains in the main sequence up to a time when there is abundant hydrogen in its core. This hydrogen fuel helps in the process of fusion and change into helium. The luminosity and the age of a main-sequence star are directly proportional to each other and when the age of these stars increases, it gradually expands and eventually cools the outer layer of the star.

After a specific period of time, when the hydrogen fuel present in the core runs out then the process of fusion recedes, thereby stops the outward radiation of pressure. These stars typically live for a time of about 10-20 billion years and then dies off. For example, the Sun.

On the other hand, smaller and less massive stars can live up to about 80-100 billion years. For example, red dwarfs.

Thus, massive stars remain in the main sequence for a shorter period of time compared to a smaller star.

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In the reaction between the strong acid HCI and the strong base NaOH which of the ions listed below is a spectator ion?
qwelly [4]

Answer:

Na+

Explanation:

The equation would be:

HCl (aq) + NaOH (aq) --> HOH (l) + NaCl (aq)

The equation is already balanced and the NaCl will disassociate in Na+ and Cl- and HCl will disassociate into H+ and Cl- and NaOH will disassociate into Na+ and OH-. Na+ is on both sides of the equation and stays the same, so Na+ will be the spectator ion.  

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-Is because when the solid is formed it is called the "precipitate", which is commonly know as chemical reaction.

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If I mixed milk and vinegar together would it be a chemical or physical change?
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What is the formula mass for carbon dioxide?
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3 years ago
phosphorus trifluoride is formed from its elements P4 (s) F2 (g) ---> PF3 (g) how many grams of fluorine are needed to react
Oksi-84 [34.3K]

This is an incomplete question, here is a complete question.

Phosphorus trifluoride is formed from its elements.

P_4(s)+6F_2(g)\rightarrow 4PF_3(g)

How many grams of fluorine are needed to react with 6.20 g of phosphorus?

Answer : The mass of F_2 needed are, 11.4 grams.

Explanation : Given,

Mass of P_4 = 6.20 g

Molar mass of P_4 = 124 g/mol

Molar mass of F_2 = 38 g/mol

First we have to calculate the moles of P_4

\text{Moles of }P_4=\frac{\text{Given mass }P_4}{\text{Molar mass }P_4}

\text{Moles of }P_4=\frac{6.20g}{124g/mol}=0.05mol

Now we have to calculate the moles of F_2

The balanced chemical equation is:

P_4(s)+6F_2(g)\rightarrow 4PF_3(g)

From the balanced reaction we conclude that

As, 1 mole of P_4 react with 6 moles of F_2

So, 0.05 moles of P_4 react with 0.05\times 6=0.30 moles of F_2

Now we have to calculate the mass of F_2

\text{ Mass of }F_2=\text{ Moles of }F_2\times \text{ Molar mass of }F_2

\text{ Mass of }F_2=(0.30moles)\times (38g/mole)=11.4g

Therefore, the mass of F_2 needed are, 11.4 grams.

4 0
3 years ago
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