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Il liquido è freddo, perciò la reazione è lenta.

Il liquido è freddo, perciò la reazione è lenta.
The liquid is cold, therefore the reaction is slow.
From Lesson 156:Result conjunctions (quindi, perciò, dunque)·Italian

Questions & Answers about Il liquido è freddo, perciò la reazione è lenta.

Could I use quindi instead of perciò in this sentence?
Yes, absolutely! Perciò, quindi, and dunque all mean 'therefore' or 'for this reason'. They are used to show the result of something, like the reaction being slow because the liquid is cold. You can swap them freely here.
Why is reazione feminine (la reazione)? I thought nouns ending in -e could be either masculine or feminine.
While nouns ending in -e can indeed be masculine or feminine, there is a helpful rule here: almost all Italian nouns ending in -zione are feminine. Because it is feminine, the adjective describing it also takes the feminine ending, becoming lenta.
Why does the word perciò have an accent mark on the last letter?
The accent mark tells you that your voice should stress the final vowel when you say it out loud. Interestingly, perciò is actually made up of two words pushed together: per (for) and ciò (this), which literally translates to 'for this'.
Why do the adjectives have different endings (freddo vs lenta)?
This is a great reminder of adjective agreement! Adjectives must match the gender of the noun they describe. Il liquido is a masculine noun, so its adjective ends in -o (freddo). La reazione is a feminine noun, so its adjective changes to end in -a (lenta).

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