In which two types of reactions do opposite chemical changes occur?

a) double replacement and combustion

b) single replacement and double replacement

c) synthesis and decomposition

d) combustion and synthesis

the answer is = c) synthesis and decomposition

The correct answer is C) Synthesis and decomposition

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

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