Ich leere den Beutel in den Mülleimer.

Yes. Leer is the adjective empty, and leeren is the verb to empty.

So in this sentence:

• ich leere = I empty
• leer by itself = empty

This is why leere can look confusing: it is the 1st person singular present-tense form of the verb leeren.

• Der Beutel ist leer. = The bag is empty.
• Ich leere den Beutel. = I empty the bag.

Because den Beutel is the direct object of the verb leeren.

The noun Beutel is masculine:

• nominative: der Beutel
• accusative: den Beutel

In this sentence, the thing being emptied is the bag, so it is the direct object and must be in the accusative case:

• Ich leere den Beutel.

If Beutel were the subject, it would be der Beutel:

• Der Beutel ist leer.

Because in is a two-way preposition in German. It can take:

• accusative for direction/movement toward somewhere
• dative for location in a place

Here, the contents are being moved into the trash can, so German uses accusative:

• in den Mülleimer = into the trash can

Compare:

• Ich werfe es in den Mülleimer. = I throw it into the trash can.
• Es ist im Mülleimer. = It is in the trash can.

So:

• in den Mülleimer = movement/destination
• im Mülleimer = location

It describes the destination of what comes out of the bag.

The sentence means that I empty the bag into the trash can. The bag is the thing being emptied, and the trash can is where the contents end up.

So the structure is:

• Ich = subject
• leere = verb
• den Beutel = thing being emptied
• in den Mülleimer = destination

It does not mean that the bag itself is being put into the trash can, at least not as the main idea of the sentence.

No. German grammar makes the roles clear.

• den Beutel is the direct object of leere, so the bag is what gets emptied.
• in den Mülleimer shows the destination.

If you wanted to say I empty the trash can into the bag, you would need something like:

• Ich leere den Mülleimer in den Beutel.

So the word forms tell you which noun is doing what.

Not exactly.

Beutel usually means a bag, pouch, or sack-like container. It often suggests something soft or flexible.

Related words:

• Beutel = bag, pouch
• Tüte = bag, especially a plastic or paper bag
• Tasche = bag, pocket, purse, or a bag with a more defined shape
• Sack = sack, large bag

So Beutel is a reasonable word if you mean a bag of contents that you are emptying out.

It is a compound noun:

• Müll = trash, garbage
• Eimer = bucket, pail

So Mülleimer literally means something like trash bucket, but in normal English you would translate it as:

• trash can
• garbage can
• bin

Like most German compound nouns, the last part decides the grammatical gender.
Since Eimer is masculine (der Eimer), Mülleimer is also masculine:

• der Mülleimer
• in den Mülleimer in the accusative

Because this is a normal main clause in German, and German main clauses usually follow the V2 rule: the finite verb comes in the second position.

Here the structure is:

• Ich = position 1
• leere = position 2
• den Beutel in den Mülleimer = the rest

So:

• Ich leere den Beutel in den Mülleimer.

You could also move another element to the front, but then the verb still stays second:

• Den Beutel leere ich in den Mülleimer.
• In den Mülleimer leere ich den Beutel.

Those versions change emphasis, but the verb still stays in second position.

It is grammatically possible, but it sounds less natural in a neutral context.

The most natural neutral order is:

• Ich leere den Beutel in den Mülleimer.

German word order is flexible, but different orders often create a special emphasis or sound marked. Putting the direct object before the destination phrase is the most ordinary choice here.

So for a learner, the best default version is the original sentence.

Yes, leeren works well, but there are other possibilities depending on style and nuance.

Common options include:

• Ich leere den Beutel in den Mülleimer.
  = I empty the bag into the trash can.

• Ich entleere den Beutel in den Mülleimer.
  Also means I empty the bag into the trash can, but entleeren can sound a bit more formal.

• Ich schütte den Beutel in den Mülleimer aus.
  This emphasizes pouring/shaking out the contents.
  A more natural version would often be:
  Ich schütte den Inhalt des Beutels in den Mülleimer.

So leeren is a good straightforward choice.

Because German does not always need a separate word for out when the verb itself already expresses the idea clearly.

In English, empty and empty out can both work. In German, leeren already means to make empty / to empty.

So:

• Ich leere den Beutel in den Mülleimer.

already naturally includes the idea that the contents are removed from the bag.

If you want to be more explicit about pouring or shaking contents out, German may use verbs like ausschütten or ausleeren, but they are not required here.

No, not in standard German.

German usually needs articles with countable nouns in sentences like this:

• den Beutel
• den Mülleimer

Without the articles, the sentence sounds ungrammatical in standard German.

So the correct version is:

• Ich leere den Beutel in den Mülleimer.

With compound nouns in German, the last element determines the gender.

Here:

• der Eimer = bucket, masculine

So:

• der Mülleimer = trash can, also masculine

That is why the accusative form is:

• in den Mülleimer

This rule is very useful with German compounds.

Yes, the ü matters. It is a different sound from u.

• Müll has ü
• Mulleimer with u would be wrong

If you cannot type ü, you can write ue:

• Muelleimer

That is a standard replacement in German spelling when umlauts are unavailable.

So:

• Mülleimer = normal spelling
• Muelleimer = acceptable fallback spelling

Not as the most natural reading.

The sentence primarily means:

• I empty the bag into the trash can

That suggests the contents go into the trash can, not necessarily the bag itself.

If you want to say you throw away the whole bag, German would more naturally say something like:

• Ich werfe den Beutel in den Mülleimer. = I throw the bag into the trash can.
• Ich schmeiße den Beutel in den Mülleimer. = same idea, more informal

So leeren focuses on removing the contents, not discarding the container itself.