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Semenov [28]
3 years ago
9

Which is it , if you are right I will give brainliest

Chemistry
2 answers:
nika2105 [10]3 years ago
7 0
A IS THE ANSWER
B is wrong cause it’s not caused by heating
C is wrong cause it’s not caused by cooling
D IS ALSO THE ANSWER
Elan Coil [88]3 years ago
6 0

Answer:

a

Explanation:

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How are atoms arranged in molecular compounds?
frutty [35]
Atoms<span> are </span>arranged in molecular compounds in groups. 
<span>
For </span>covalent compounds<span>: </span>
<span>consider drawing the lewis structure of the covalent compound in question, putting the atom which is least electronegative (save hydrogen) in the center.


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4 0
3 years ago
Calculate Srxn for the equation below. (Round to the nearest whole number.)
zaharov [31]

Answer:The the \Delta S_{rxn} for the given reaction is 179.98 J/K.

Explanation:

4NH_3(g)+5O_2(g)\rightarrow 4NO(g)+6H_2O(g),\Delta S_{rxn}=?

=192.8 J/mol K

\Delta S_{O_2}=205.0 J/mol K

\Delta S_{H_2O}=188.83 J/mol K

\Delta S_{NO}=210.8 J/mol K

\Delta S_{rxn}=(4 mol\times \Delta S_{NO}+6 mol\times \Delta S_{H_2O})-(4 mol\times \Delta S_{NH_3}-5 mol\times \Delta S_{O_2})

\Delta S_{rxn}=(4\times 210.8 J/mol K+6\times 188.83 J/mol K)-(4\times 192.8 J/mol K+5\times 205.0 J/mol K)

\Delta S_{rxn}=179.98 J/K

The the \Delta S_{rxn} for the given reaction is 179.98 J/K.

4 0
3 years ago
Plants need light to make there food
ValentinkaMS [17]

Answer:

photosynthesis

Explanation:

7 0
3 years ago
Read 2 more answers
Which of these does NOT involve a chemical change? a. Red delicious apples fell to the ground. b. Cocaine causes the release of
gregori [183]

Answer:

c. Mercury is used in barometers because it has a high density

Explanation:

Chemical change -  

It refers to any change in a chemical process , where there is formation of any new substance , is referred to as a chemical change .

The indication of any chemical change is the formation of some new substance.

Hence, from the question,

The process which does not involve chemical change is  -

The use of mercury in barometer , to measure pressure , in this process no new substance is formed i.e. , now change in mercury.

8 0
3 years ago
If the reactants of a reaction have ab initial mass of 25 grams what is the mass of the product?
Studentka2010 [4]

Answer:

It remains the same

Explanation:

The law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. For example, the mass of sodium plus the mass of chlorine that reacts with the sodium equals the mass of the product sodium chloride.

8 0
3 years ago
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