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photoshop1234 [79]
3 years ago
11

The Universe is composed of...?

Chemistry
2 answers:
exis [7]3 years ago
8 0
A.
everything in existence.
Olegator [25]3 years ago
5 0
The answer is A. everything in existence...please give brainliest answer if I helped you. :)
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What force on Earth can affect the pull of gravity?
MakcuM [25]

Objects with more mass have more gravity. Gravity also gets weaker with distance. So, the closer objects are to each other, the stronger their gravitational pull is. Earth's gravity comes from all its mass.

7 0
3 years ago
Read 2 more answers
Hi! It would be awesome if you could answer this soon. 20 points!
NikAS [45]

Answer:

2HgO    →     2Hg      +  O₂

The reaction is a decomposition reaction because from one reactant two products were obtained

Explanation:

The problem here involves balancing the chemical reaction given and also classifying the reaction.

 The unbalanced expression is given as:

              HgO    →     Hg      +  O₂

Assign the alphabets a,b and c as coefficients that will balance the equation

           aHgO    →     bHg      +  cO₂

Conserving Hg: a  = b

                   O:    a  = 2c

So, let c  = 1, a  = 2 b  = 2

Therefore;

       2HgO    →     2Hg      +  O₂

The reaction is a decomposition reaction because from one reactant two products were obtained

3 0
3 years ago
A reaction that occurs in the internal combustion engine is
Anna35 [415]

Answer:

Explanation:1) ΔrH = 2mol·ΔfH(NO) - (ΔfH(O₂) + ΔfH(N₂)).

ΔrH = 2 mol · 90.3 kJ/mol - (0 kJ/mol + 0 kJ/mol).

ΔrH = 180.6 kJ.

2) ΔS = 2mol·ΔS(NO) - (ΔS(O₂) + ΔS(N₂)).

ΔS = 2mol · 210.65 J/mol·K - (1mol · 205 J/mol·K + 1 mol · 191.5 J/K·mol).

ΔS = 24.8 J/K.

3) ΔG = ΔH - TΔS.

55°C: ΔG = 180.6 kJ - 328.15 K · 24.8 J/K = 172.46 kJ.

2570°C: ΔG = 180.6 kJ - 2843.15 K · 24.8 J/K = 110.09 kJ.

3610°C: ΔG = 180.6 kJ - 3883.15 K · 24.8 J/K = 84.29 kJ.

7 0
3 years ago
Two or more substances in variable proportions, where the composition is variable throughout are a a homogeneous mixture. b a so
REY [17]

<u>Answer:</u> In heterogeneous mixture, the composition remains variable throughout.

<u>Explanation:</u>

For the given options:

Homogeneous mixtures are defined as the mixtures that appears uniformly throughout the solution and the particle size or shapes are not different. The composition remains constant throughout.

A solution is defined as the solution in which the components gets completely dissolved in it. Particles are evenly spread in these solutions. These solution does not scatter light falling on it. The composition remains constant throughout.

An amorphous solid is defined as the solid in which the constituent particles of the matter are arranged in the random manner. The composition remains constant throughout.

A heterogeneous mixture is defined as the mixture in which component are unevenly spread throughout the solution. The size and shape of the particles differ in these mixtures. These mixture scatter the light falling on it.  The composition do not remains constant throughout.

Compound is defined as the chemical specie which is formed by the combination of two or more different type of atoms. <u>For Example:</u> H_2O,O_2 etc...The composition remains constant throughout.

Hence, in heterogeneous mixture, the composition remains variable throughout.

4 0
4 years ago
What are the man-made, or synthesized, metals called?<br><br> You don't need to explain
lubasha [3.4K]

Answer:

Technetium, Promethium, Astatine, Francium

Explanation:

3 0
4 years ago
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