Bei der Moderation löst sie die Schätzfrage auf.

German often puts a time, place, or context phrase first to set the scene.

Here, Bei der Moderation gives the context first: during the hosting/presenting or as part of the moderation.

When German puts something other than the subject first, the conjugated verb still has to stay in position 2. That is why the sentence is:

Bei der Moderation löst sie die Schätzfrage auf.

and not:

Bei der Moderation sie löst ...

So the structure is:

• Bei der Moderation = first element
• löst = finite verb in second position
• sie = subject
• die Schätzfrage = object
• auf = separable prefix at the end

Because bei always takes the dative case.

The noun die Moderation is feminine, and its article changes in the dative singular:

• nominative: die Moderation
• dative: der Moderation

So:

• bei der Moderation = correct
• bei die Moderation = incorrect

This is one of those things you simply have to learn with the preposition:
bei + dative

In this sentence, bei means something like during, in the context of, or as part of.

It does not literally mean only near here, even though bei can often mean at or near in other contexts.

Common uses of bei include:

• bei der Arbeit = at work / while working
• beim Essen = while eating
• bei der Moderation = during the moderation / while hosting

So here it introduces the situation in which the action happens.

Not exactly.

In German, Moderation often means hosting, presenting, or MC work, especially in media, events, quizzes, shows, or discussions.

So in this kind of sentence, Moderation is usually about someone leading or presenting something, not about the abstract English idea of doing something in moderation.

Depending on context, it can also mean moderation in the sense of supervising a discussion or online content, but in a sentence like this, learners often need to notice that it can mean presentation/hosting duties.

Because the verb is auflösen, which is a separable verb.

Its full infinitive is:

• auflösen

In a main clause, the prefix auf- separates and goes to the end:

• sie löst ... auf

This is very common in German:

• anrufen → ich rufe dich an
• einkaufen → wir kaufen ein
• auflösen → sie löst die Schätzfrage auf

So löst is the conjugated main part, and auf is the separated prefix.

löst is the 3rd person singular present tense form of auflösen.

The subject is sie, meaning she, so the verb is conjugated accordingly:

• ich löse auf
• du löst auf
• er/sie/es löst auf
• wir lösen auf
• ihr löst auf
• sie/Sie lösen auf

So sie löst ... auf means she ...s up/resolves/reveals, depending on context.

Because it is the direct object of the verb auflösen here.

She is doing the action to the Schätzfrage, so that noun phrase is in the accusative.

Since Schätzfrage is feminine, the article is:

• nominative: die
• accusative: die

So the form does not change visibly here, but it is still accusative in function.

That is why you see:

• die Schätzfrage = direct object

Schätzfrage is a compound noun:

• schätzen = to estimate / to guess
• die Frage = question

So die Schätzfrage is literally an estimation question or guessing question.

German very often builds nouns this way. The last part determines the grammatical gender, and here the last part is Frage, which is feminine. That is why the whole compound is feminine:

• die Frage
• die Schätzfrage

That is a very good question, because auflösen has several meanings.

Depending on context, it can mean things like:

• to dissolve something
• to break up something
• to resolve something
• to reveal the answer to something

In the context of a quiz or guessing question, eine Frage auflösen means to reveal, announce, or explain the correct answer.

So this is one of those verbs whose exact meaning depends heavily on context. German does this a lot with separable-prefix verbs.

Yes, that is grammatically possible.

German word order is fairly flexible, as long as the main rules are respected:

• the finite verb stays in second position in a main clause
• the separable prefix stays at the end

So both of these are possible:

• Bei der Moderation löst sie die Schätzfrage auf.
• Sie löst bei der Moderation die Schätzfrage auf.

The difference is mainly focus:

• starting with Bei der Moderation emphasizes the context
• starting with Sie emphasizes the person

That is the normal behavior of a separable verb in a main clause.

With auflösen, the conjugated part goes near the beginning, and the prefix moves to the end:

• infinitive: auflösen
• main clause: sie löst ... auf

This can feel strange to English speakers because you have to wait until the end to get the full verb. But it is a central pattern in German sentence structure.

You can think of it as:

• löst = the verb stem and ending
• auf = the missing final piece of the verb

So the sentence is complete only when you reach auf.