La sopa está demasiado espesa.

Because Spanish usually uses estar for a current condition or state, and ser for a more permanent or defining characteristic.

In La sopa está demasiado espesa, the idea is that the soup has turned out too thick right now. That is a temporary result or condition, so estar is the natural choice.

• está demasiado espesa = it is too thick right now
• es demasiado espesa = sounds more like “it is an overly thick kind of soup by nature” or “this soup is generally too thick,” which is much less common in everyday cooking contexts

So for food texture, temperature, doneness, etc., Spanish often uses estar:

• El café está frío.
• La carne está cruda.
• La salsa está muy salada.

La is the definite article, meaning the.

Spanish uses articles more often than English does, so la sopa is the normal way to say the soup.

You usually would not say just Sopa está demasiado espesa. That sounds wrong in standard Spanish.

You can leave out la sopa entirely if the context is already clear:

• Está demasiado espesa. = It’s too thick.

But if you mention the noun, you normally need the article:

• La sopa está demasiado espesa.

Because espesa is an adjective agreeing with sopa, and sopa is a feminine singular noun.

In Spanish, adjectives usually agree in gender and number with the noun they describe:

• el caldo espeso = the thick broth
• la sopa espesa = the thick soup
• las sopas espesas = the thick soups

So:

• sopa → feminine singular
• adjective must match → espesa

Here demasiado means too.

So:

• demasiado espesa = too thick

It does not mean simply very in this sentence. It suggests more than is desirable.

Compare:

• La sopa está muy espesa. = The soup is very thick.
• La sopa está demasiado espesa. = The soup is too thick.

That second sentence implies there is a problem: maybe it needs more water or broth.

Because in this sentence demasiado is acting as an adverb, modifying the adjective espesa, not the noun sopa directly.

Adverbs do not agree in gender or number:

• demasiado espesa
• demasiado espeso
• demasiado calientes

But demasiado can also be an adjective, and then it does agree:

• Demasiada sopa = too much soup
• Demasiado pan = too much bread
• Demasiadas verduras = too many vegetables

So compare these two:

• La sopa está demasiado espesa.
  Here demasiado = adverb = too
• Hay demasiada sopa.
  Here demasiada = adjective = too much

Yes, but the meaning changes.

• muy espesa = very thick
• demasiado espesa = too thick

Use muy when you are just describing intensity. Use demasiado when you mean it has gone beyond what is good, normal, or wanted.

Examples:

• La sopa está muy espesa, me gusta así. = The soup is very thick; I like it that way.
• La sopa está demasiado espesa, añade agua. = The soup is too thick; add water.

Yes. Espeso / espesa is the normal word for a liquid or semi-liquid food that has a thick consistency.

It is commonly used for:

• soup
• sauce
• cream
• hot chocolate
• puree-like textures

Examples:

• La salsa está espesa. = The sauce is thick.
• El chocolate está muy espeso. = The hot chocolate is very thick.

English speakers sometimes think of grueso/a for thick, but grueso/a is more for physical thickness, like:

• a thick book
• a thick wall
• a thick sweater

So for soup, espesa is the natural choice.

The accent mark distinguishes está from esta.

• está = he/she/it is or you are from estar
• esta = this (feminine), as in esta sopa = this soup

So the accent is important because it shows that this is a verb form, not a demonstrative word.

Examples:

• Esta sopa está rica.
  • esta sopa = this soup
  • está = is

Usually the most neutral order is:

• La sopa está demasiado espesa.

Spanish does allow some flexibility, but not every change sounds equally natural.

Possible alternatives:

• Está demasiado espesa, la sopa.
  This is possible, but it sounds marked, like you are adding the soup after the fact for emphasis or clarification.

Less natural in normal speech:

• La sopa demasiado espesa está.
  This sounds awkward or poetic, not standard everyday phrasing.

So for normal conversation, stick with:

• La sopa está demasiado espesa.

Yes, if everyone already knows you are talking about the soup.

Spanish often drops the subject when the context is clear:

• Está demasiado espesa. = It’s too thick.

This is very natural in conversation, especially while cooking or eating.

For example:

• ¿Qué tal la sopa?
• Está demasiado espesa.

But if the context is not clear, include the noun:

• La sopa está demasiado espesa.

A simple pronunciation guide is:

la SO-pa es-TA de-ma-SYA-do es-PE-sa

A few notes:

• sopa has stress on SO
• está has stress on the last syllable: TA
• demasiado has stress on SYA
• espesa has stress on PE

In much of Spain, c before e/i and z are pronounced with a th sound, but this sentence does not contain those letters in that position, so that particular Spain feature does not affect it.

The h is absent here, and all letters are pronounced fairly clearly. The sentence has a smooth rhythm:

• La sopa | está | demasiado espesa

Yes, usually.

Because of demasiado, the sentence normally means the thickness is excessive or undesirable. It suggests that something should be changed.

For example, a cook might say this before adding liquid:

• La sopa está demasiado espesa; voy a añadir un poco de agua.

So the sentence is not just neutral description. It usually carries the idea:

• the soup is thicker than it should be