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Alekssandra [29.7K]
3 years ago
6

What properties can you observe about the Sun?

Chemistry
2 answers:
Alisiya [41]3 years ago
8 0
The sun is made up of mainly gases and a VERY hot core, it is considered a yellow dwarf, solar flares/sunspots can affect the earth, it is currently expanding as stars do when they get older
nexus9112 [7]3 years ago
5 0
Energy- The ability to do work or cause a change.
Gravity- A force that pulls objects toward each other.
Light- A kind of energy that you can see.
Sun- The star that is near Earth.
Temperature- A measure of how hot and cold something is.
Transform- To change.
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Nitrogen and hydrogen combine to form ammonia in the Haber process. Calculate (in kJ) the standard enthalpy change ∆H° for the r
Kazeer [188]

Answer:

∆H° rxn = - 93 kJ

Explanation:

Recall that a change in standard in enthalpy, ∆H°, can be calculated from the inventory of the energies, H, of the bonds  broken minus bonds formed (H according to Hess Law.

We need to find in an appropiate reference table the bond energies for all the species in the reactions and then compute the result.

              N₂ (g)   +            3H₂ (g)   ⇒                          2NH₃ (g)

1 N≡N = 1(945 kJ/mol)     3 H-H = 3 (432 kJ/mol)       6 N-H = 6 ( 389 kJ/mol)

∆H° rxn = ∑  H bonds broken  - ∑ H bonds formed

∆H° rxn = [ 1(945 kJ)   + 3 (432 kJ) ] - [ 6 (389 k J]

∆H° rxn = 2,241 kJ -2334 kJ = -93 kJ

be careful when reading values from the reference table since you will find listed N-N bond energy (single bond), but we have instead a triple bond,  N≡N,  we have to use this one .

8 0
3 years ago
A chemical reaction occurs when 2 white solids are stirred together they turn into a slushy white solid and the glass jar feels
Anestetic [448]

Answer:

Absorbed, endothermic

Explanation:

Based on the heat of reaction, chemical reactions may be classified as endothermic or exothermic.

In an endothermic reaction, heat is absorbed from the surrounding. As heat is absorbed from the surrounding, the reaction vessel feels cool when touched.

On the other hand, in an exothermic reaction, heat is given out by the system to the surrounding and the reaction vessel feels hot when touched.

Hence the reaction is endothermic and energy is absorbed during the reaction.

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densk [106]

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c) hereditary

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This means that if your parents had one eye colour, you'll most likely have the same one because you share the same genes, and it's passed down to you.

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