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Fofino [41]
3 years ago
11

Is the Hertzsprung-Russell diagram still a valid instrument in studying stars, given that it is over 100 years old?

Chemistry
2 answers:
svet-max [94.6K]3 years ago
8 0

Answer:

Yes.

Explanation:

Hello,

As long as it shows important relationships between the size and color of stars, age wouldn't affect observation and measurement but will just provide more accurate results but the method is still valid.

Best regards.

klemol [59]3 years ago
8 0

Answer:

Yes, because it is still relevant today.

Explanation:

It shows the coloration of stars with each other, the brightness and all.

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The mixture which contains elements only is (a) air (b) brass (c) mineral water (d) seawater
Sholpan [36]

Answer:

So yes! A mixture can contain just elements if those elements are not chemically reactive to one another. Air is a great example of an elemental mixture as it contains nitrogen, oxygen, and argon (along with some other compounds).

Explanation:

hope this helps you :)

4 0
3 years ago
Read 2 more answers
Select the correct answer. Given: 2Al + 6HCl → 2AlCl3 + 3H2 If the chemical reaction produces 129 grams of AlCl3, how many grams
ivann1987 [24]

The reaction produces 2.93 g H₂.

M_r:                        133.34  2.016

        2Al + 6HCl → 2AlCl₃ + 3H₂

<em>Moles of AlCl₃</em> = 129 g AlCl₃ × (1 mol AlCl₃/133.34 g AlCl₃) = 0.9675 mol AlCl₃

<em>Moles of H₂</em> = 0.9675 mol AlCl₃ × (3 mol H₂/2 mol AlCl₃) = 1.451 mol H₂

<em>Mass of H₂</em> = 1.451 mol H₂ × (2.016 g H₂/1 mol H₂) = 2.93 g H₂

7 0
3 years ago
Balance the equation<br> N2O5 + H2 -&gt; NH3 + H2O
Lubov Fominskaja [6]

Answer:

I hope this is it. I'm not really sure.

4 0
3 years ago
Cacl2 is an example of
11111nata11111 [884]
An ionic bond because ca is a metal and cl is a nonmetal which is an ionic bond
5 0
3 years ago
The specific heats at constant pressure of some common gases are provided as a thirdorder polynomial: �;&lt;&lt;&lt; = � + �� +
3241004551 [841]

Answer:

1.991 kJ

Explanation:

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CH4 ;

coefficients are :  a = 19.89 , b = 5.02 * 10^-2 , c = 1.269 * 10^-5 , d = -11.01 * 10^-9

attached below is the detailed solution

3 0
3 years ago
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