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SCORPION-xisa [38]
2 years ago
7

We can identify unknown elements in a star by matching the ___________ spectrum of the star to those of known elements. *

Chemistry
1 answer:
const2013 [10]2 years ago
4 0
Emission spectrum, mass spectrum does not make sense and neither does atoms spectrum. You use the emission spectrum to compared known elements in a star to the unknown elements in a star. Hope this help!
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As temperature increase and the volume stays constant, how will the pressure change
crimeas [40]

Answer:

There will be more collisions and so a greater pressure. The number of particles is proportional to pressure, if the volume of the container and the temperature remain constant. ... Volume is inversely proportional to pressure, if the number of particles and the temperature are constant.

5 0
2 years ago
How many grams of H, are needed to react with 2.75 g of N,?
Elena-2011 [213]

Answer:

0.6 grams of hydrogen are needed to react with 2.75 g of nitrogen.

Explanation:

When hydrogen and nitrogen react they form ammonia.

Chemical equation:

N₂ + 3H₂ → 2NH₃

Given mass of nitrogen = 2.75 g

Number of moles of nitrogen:

Number of moles = mass/ molar mass

Number of moles = 2.75 g / 28 g/mol

Number of moles = 0.098 mol

Now we will compare the moles of nitrogen with hydrogen from balance chemical equation:

                   N₂             :          H₂

                    1               :           3

                   0.098       :        3×0.098 = 0.3 mol

Mass of hydrogen:

Mass = number of moles × molar mass

Mass = 0.3 mol × 2 g/mol

Mass = 0.6 g

6 0
3 years ago
Compared to a sodium atom in the ground state a sodium atom in the excited state must have ?
kipiarov [429]
An electron with greater energy.

I hope this helps :)
6 0
2 years ago
What is the formula for lead (2) bromide
jeka94

PbO

Br-


Hope this helps!!!

6 0
3 years ago
Jose mixed two clear liquids together in a beaker in equal amounts. Jose measured the mass. The mass of the two combined solutio
Dmitrij [34]
Who cares. Joe can solve his own problem instead of making people do it. (This was not toward you. This was supposed to be funny)
5 0
2 years ago
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