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Dafna1 [17]
3 years ago
13

Massive stars have lower absolute brightness true or false

Chemistry
2 answers:
Juliette [100K]3 years ago
6 0
<span>The answer should be false, because mass should not have to do with how bright a star is </span>
Inessa [10]3 years ago
6 0

The brightness of a star is measured as luminosity. It is a simple factor of energy emitted by a star in a unit time or generally per second.

the following factors may affect the brightness of a star

a) Temperature of star

b) size of star: larger the size more the brightness

c) distance from observer : closer the star brighter it will appear

so massive stars or stars with large mass have lower absolute brightness will be false.

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Sidana [21]

Answer:

Magnets can be used to make other magnets and things made of iron move without being touched. Something that has been electrically charged can make other things move without touching them.

Explanation:

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8 0
3 years ago
How many moles of water are produced when 10 moles of hydrogen gas reacts with an excess of oxygen? (whole number)
asambeis [7]

Answer:

12 moles H

2

O

Explanation:

Your tools of choice for stoichiometry problems will always be the mole ratios that exist between the chemical species that take part in the reaction.

As you know, the stoichiometric coefficients attributed to each compound in the balanced chemical equation can be thought of as moles of reactants needed or moles of products formed in the reaction.

In your case, the balanced chemical equation for this synthesis reaction looks like this

2

H

2(g]

+

O

2(g]

→

2

H

2

O

(l]]

Notice that the reaction requires  

2

moles of hydrogen gas and  

1

mole of oxygen gas to produce  

2

moles of water.

This tells you that the reaction produces twice as many moles of water as you have moles of oxygen gas that take part in the reaction.

You know that your reaction uses  

6.0

moles of oxygen. Assuming that hydrogen gas is not a limiting reagent, you can say that the reaction will produce

6.0

moles O

2

⋅

2

moles H

2

O

1

moles O

2

=

12 moles H

2

O

Explanation:

6 0
3 years ago
Which statement best describes chemical properties of matter? Chemical properties, such as density, must be observed when a subs
Ne4ueva [31]

Answer:

Chemical properties, such as combustibility, are generally observed as the identity of a substance changes and one or more new substances form.

Explanation:

4 0
3 years ago
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300.0 mL of a gas is at a pressure of 5.00 atm. What is the volume of the gas at 2.00 atm?
barxatty [35]
I think that it would be b
7 0
3 years ago
HeLP PLeaSe SEND HElP AAAAAAAAAAAAA
nevsk [136]

Answer:

Correct answer is Li

Explanation:

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Hence the reducing agent in this reaction is Li

4 0
3 years ago
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