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sesenic [268]
3 years ago
11

Which statements describe dark matter? Check all that apply. It is invisible. It is the same as dark energy. It is well understo

od by scientists. It does not emit electromagnetic radiation. It can be observed by shifts in red and blue light.
Chemistry
2 answers:
Llana [10]3 years ago
7 0

Answer:

Space that appears empty actually contains dark energy and dark matter.

Dark matter does not emit electromagnetic radiation.

Scientists theorize that dark energy is causing the expansion of the universe to accelerate.

JUST TOOK THE ASSESSMENT!

Alla [95]3 years ago
4 0

Dark matter is invisible and does not emit electromagnetic radiation. Dark matter is part of a theory that hypothesis the existence of a counterpart to the particles we know in physics, in order to balance the universe that otherwise would be largely unbalanced right now. However, the theory right now is not yet proven.

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Tungsten (W) and chlorine (Cl) form a series of compounds with the following compositions:_______.
deff fn [24]

Answer:

WCl₂, WCl₄, WCl₅, WCl₆

Explanation:

Molar Mass of Tungsten = 184 g/mol

Mass of Chlorine = 35.5 g/mol

In the first compound;

Percentage of tungsten = 72.17 %

Upon solving;

72.17 % = 184

100 % = Total mass

Total mass of compound = 254.95g

Mass of chlorine = 254.95 - 184 = 70.95 (Dividing by 35.35; This is approximately 2 Chlorine atoms.

The Formular is WCl₂

In the second compound;

Percentage of tungsten = 56.45 %

Upon solving;

56.45 % = 184

100 % = Total mass

Total mass of compound = 325.95 g

Mass of chlorine = 325.95 - 184 = 141.95g (Dividing by 35.35; This is approximately 4 Chlorine atoms.

The Formular is WCl₄

In the third compound;

Percentage of tungsten = 50.91 %

Upon solving;

50.91 % = 184

100 % = Total mass

Total mass of compound = 361.42 g

Mass of chlorine =  361.42 - 184 = 177.42 (Dividing by 35.35; This is approximately 5 Chlorine atoms.

The Formular is WCl₅

In the fourth compound;

Percentage of tungsten = 46.39 %

Upon solving;

46.39 % = 184

100 % = Total mass

Total mass of compound = 396.64 g

Mass of chlorine = 396.64 - 184 = 212.64 (Dividing by 35.35; This is approximately 6 Chlorine atoms.

The Formular is WCl₆

4 0
4 years ago
What is the hydrogen ion concentration in a solution with a pH of 8.0??
finlep [7]
- log [H+] = 8
log [H+] = -8
10^(log [H+]) = 10^-8
[H+] = 1x10^-8 M
5 0
4 years ago
A substance that is present in a reaction but not used up in the reaction is called a _____.
aleksandrvk [35]
They are called spectator ions. 

8 0
3 years ago
Why are mole ratios important to stoichiometry calculations?
pishuonlain [190]
<span>Mole ratios are important to stoichiometric calculations because they bridge the gap when we have to convert between the mass of one substance and the mass of another.</span>
7 0
3 years ago
Which is the best example of water regulating an organism’s body temperature?
stepladder [879]
The best example is evaporation

4 0
3 years ago
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