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Hello,

Are my sentences correct?

1) The article is about unconscious competence which the passage defines as mastering a task so that it becomes second nature.
2) The article is about unconscious competence which the passage defines as when a person masters a task, it becomes second nature.
3) The article is about chemical reactions which the passage defines as when two substances react with each other and form a new compound.
4)The article is about chemical reactions which the passage defines as two substances react with each other and form a new compound.

Thank you in advance and Happy New Year.
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1. The article is about X, which ...
2. Where X is a noun, you need a noun at Y. Try to make both singular or both plural; both countable or both uncountable; and so on.

... X, which the passage defines as Y. (defines as when/where/why/how/ ... is not good.)

... unconscious competence, which the passage defines as mastering a task ...
... chemical reaction, which the passage defines as the formation of a new compound from two substances.

And it's not a good idea to define a word by using the same word or a variant of it in the definition - if you can possibly avoid it.

A definition is a group of words that define. < Not good.
A chemical reaction is when chemicals react. < Not good.

CJ
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You need a noun or noun phrase in parallel with the preceding noun ('competence', 'reactions'). These are correct:

1) The article is about unconscious competence, which the passage defines as mastering a task so that it becomes second nature.
4)The article is about chemical reactions, which the passage defines as the interactions of two substances with each other to form a new compound.
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Comments  
quaereeverumHello, Are my sentences correct?
1) The article is about unconscious competence, which the passage defines as mastering a task so (that) it becomes second nature. Emotion: yes
2) The article is about unconscious competence, which the passage defines as when a person masters a task so it becomes second nature. Emotion: no "un... comp..." is not a "when"; at least it should not be defined with "when".
3) The article is about chemical reactions, which the passage defines as when two substances react with each other and form a new compound. Emotion: no see above
4)The article is about chemical reactions, which the passage defines as two substances reacting with each other and forming a new compound. Emotion: yes
I don't know why spaces between words that were there and what I added to them are being created. Emotion: sad
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Thank you very much, finally I've learned how to use 'defines as.It is very important since in the task 4 TOEFL IBT we have to connect two sources.