Deze beamer is te zwaar om alleen te verplaatsen.

Because beamer is a de-word in Dutch: de beamer.

With Dutch demonstratives:

• deze goes with de-words
• dit goes with het-words

So:

• deze beamer = this projector
• but, for example, dit huis = this house

A good habit is to learn nouns together with their article:

• de beamer
• het boek
• de tafel

In Dutch, beamer usually means projector.

This can confuse English speakers, because beamer is not the normal everyday English word for that. But in Dutch, de beamer is very common for a video/data projector used in classrooms, offices, or meetings.

Because zwaar is being used as a predicative adjective, not directly before a noun.

Compare:

• een zware beamer = a heavy projector
  Here the adjective comes before the noun, so it usually gets -e.
• deze beamer is zwaar = this projector is heavy
  Here the adjective comes after is, so it does not take -e.

In your sentence:

• Deze beamer is te zwaar ...

So zwaar stays in its basic form.

Here te means too.

So:

• zwaar = heavy
• te zwaar = too heavy

This is a very common pattern in Dutch:

• te duur = too expensive
• te groot = too big
• te laat = too late

So Deze beamer is te zwaar means This projector is too heavy.

That second te is a different te.

In om ... te + infinitive, te is the marker used before the infinitive, similar to English to in many cases.

So:

• om te verplaatsen = to move
• om te lezen = to read
• om te helpen = to help

In this sentence:

• te zwaar om alleen te verplaatsen

literally follows the Dutch pattern too heavy to move alone.

So the two te words do different jobs:

• te zwaar = too heavy
• te verplaatsen = to move

It introduces an infinitive clause explaining the result or consequence of te zwaar.

The pattern is:

• te + adjective + om ... te + infinitive

Examples:

• te moe om te werken = too tired to work
• te jong om te rijden = too young to drive
• te zwaar om te tillen = too heavy to lift

So here:

• te zwaar om alleen te verplaatsen
  = too heavy to move alone

This is a very common and useful structure in Dutch.

Because Dutch infinitive clauses often place the infinitive at the end, especially in an om ... te structure.

So in:

• om alleen te verplaatsen

the infinitive verplaatsen comes last.

This is normal Dutch word order. You will see this a lot:

• Ik probeer het boek te lezen.
• Hij heeft besloten naar huis te gaan.
• Ze is te moe om verder te werken.

For English speakers, this often feels a bit “back-loaded,” because Dutch likes to place verbs later in the clause.

Here alleen means alone or by yourself, not only.

So:

• alleen te verplaatsen = to move by yourself / to move alone

This word can have more than one meaning depending on context:

• Ik ben alleen. = I am alone.
• Ik wil alleen water. = I only want water.

In your sentence, because it is about physically moving something, alleen clearly means without help.

Because it belongs naturally with the infinitive clause and tells you how the moving would be done: alone.

So:

• om alleen te verplaatsen

means roughly:

• to move by yourself

Dutch often places adverbs like this before the infinitive they modify.

You could think of the structure as:

• om [alleen] te [verplaatsen]

where alleen modifies the action.

Because Dutch, like English in similar sentences, can leave the object understood from the main clause.

English says:

• This projector is too heavy to move alone.

It does not have to say:

• This projector is too heavy to move it alone.

Dutch works the same way:

• Deze beamer is te zwaar om alleen te verplaatsen.

The thing being moved is already clear: deze beamer.

So Dutch does not need to repeat it.

Because verplaatsen means to move/relocate, while plaatsen usually means to place/put something somewhere.

So:

• plaatsen = to place, put
• verplaatsen = to move from one place to another

In this sentence, the idea is not simply “putting” the projector somewhere, but moving it. That is why verplaatsen is the natural verb.

Yes. That is possible, but the nuance is a little different.

• alleen = alone, without help
• zelf = yourself, personally

In many situations they are quite close:

• te zwaar om alleen te verplaatsen
• te zwaar om zelf te verplaatsen

But alleen emphasizes without anyone helping you, while zelf emphasizes you personally doing it.

If you want the clearest meaning of without help, alleen is very natural here.

Yes, it is natural and idiomatic.

It uses a very common Dutch pattern:

• [subject] + is + te + adjective + om + ... + te + infinitive

So this sentence is a good model to learn from.

You could build similar sentences like:

• Deze doos is te zwaar om alleen te dragen.
• Dit probleem is te moeilijk om snel op te lossen.
• Hij is te jong om alleen te reizen.

So the grammar here is standard, useful, and very common in everyday Dutch.