Breakdown of Химическая реакция, которая идёт сейчас, очень опасная, пока мы нагреваем жидкость.
мы
we
очень
very
сейчас
now
идти
to go (on foot) / to proceed, go (of a process)
опасный
dangerous
который
which / who / that (relative pronoun)
пока
while
жидкость
liquid
химический
chemical
реакция
reaction
нагревать
to heat
Questions & Answers about Химическая реакция, которая идёт сейчас, очень опасная, пока мы нагреваем жидкость.
How do we know пока means "while" here instead of "until"?
When пока is used on its own, it means "while" or "as long as". To mean "until", it needs to be paired with не (пока не). Also, notice that both verbs describing the simultaneous events (идёт and нагреваем) are imperfective, which is the standard way to show two ongoing actions happening at the same time.
Why is the verb идёт used to describe a chemical reaction?
In Russian, the verb идти (to go/walk) is widely used for processes that are currently in progress or "underway". Just like a movie, a meeting, or rain can "go" (идёт дождь), a chemical reaction also uses this verb when it is actively taking place.
Could we use the short adjective опасна instead of the long form опасная here?
Yes, you could say очень опасна. Using the long form опасная is very common in everyday speech and treats the danger as a built-in characteristic of this reaction. The short form опасна would sound a bit more formal or academic, and would emphasize that the reaction is dangerous specifically in this current temporary state.
We are heating the liquid, so why didn't the ending of жидкость change to show it is the direct object?
It actually is in the accusative (direct object) case! Жидкость is a feminine noun that ends in a soft sign (-ь). For this specific group of nouns (the 3rd declension), the accusative form is completely identical to the nominative dictionary form.
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