Si rompes la cáscara con cuidado, la yema sale entera.

Because after si for a real, possible condition in the present, Spanish normally uses the present indicative, not the subjunctive.

So:

• Si rompes la cáscara... = If you break the shell...

This is the normal pattern for real conditions:

• Si estudias, apruebas.
• Si vienes, te ayudo.

You would not say si rompas here.

Spanish often drops subject pronouns because the verb ending already shows who the subject is.

• rompes = you break
• so tú is understood

The full version would be:

• Si tú rompes la cáscara con cuidado, la yema sale entera.

But in normal Spanish, leaving out tú sounds more natural unless you want emphasis or contrast.

Yes. The present tense here expresses a general fact, habitual result, or something that is normally true.

• Si rompes la cáscara con cuidado, la yema sale entera. = If you break the shell carefully, the yolk comes out whole.

This is not necessarily about one specific egg at one specific moment. It sounds like a general statement or practical tip.

Spanish often uses the present like this:

• Si calientas agua, hierve.
• Si comes mucho, te sientes pesado.

Con cuidado means carefully or more literally with care.

It is a very common Spanish expression:

• Hazlo con cuidado. = Do it carefully.
• Abre la caja con cuidado. = Open the box carefully.

Spanish often prefers a phrase like con cuidado instead of an adverb ending in -mente.

You could also say:

• cuidadosamente

But con cuidado is usually more natural and more common in everyday speech.

Spanish often uses the definite article more than English does.

Here:

• la cáscara = the shell
• la yema = the yolk

Even when English might use no article or a possessive, Spanish often still uses el/la.

In this sentence, the article sounds natural because we are talking about:

• the shell of the egg
• the yolk of the egg

Spanish frequently identifies parts of something this way.

Yes, salir often means to go out, to leave, or to come out. In this sentence it means:

• la yema sale entera = the yolk comes out whole

So sale here is from salir and means comes out.

This is a very common use:

• El agua sale fría. = The water comes out cold.
• La mancha no sale. = The stain does not come out.
• El sol sale. = The sun comes out / rises.

Because entera agrees with la yema, which is a feminine singular noun.

• la yema = feminine singular
• therefore: entera = feminine singular

So:

• la yema sale entera = the yolk comes out whole/intact

If the noun were masculine, you would use entero:

• el huevo sale entero

In this context, entera means whole or intact.

It does not mean entire in an abstract sense here. It means the yolk stays unbroken.

So:

• la yema sale entera = the yolk comes out whole / intact

This is a very natural use of entero/a:

• Comí la manzana entera. = I ate the whole apple.
• El vaso llegó entero. = The glass arrived intact.

Not if you want the same meaning.

• huevo = egg
• yema = yolk

The sentence specifically talks about the yolk coming out whole after breaking the shell carefully.

If you said:

• el huevo sale entero

that would mean the egg comes out whole, which does not fit this situation in the same way, because once you break the shell, the whole egg is no longer really intact as a complete egg. The important part here is the yolk remaining unbroken.

Cáscara can refer to the shell, peel, or skin of various things, depending on context.

Examples:

• la cáscara del huevo = eggshell
• la cáscara de naranja = orange peel
• la cáscara de plátano = banana peel

In this sentence, because of la yema, it is clearly the shell of an egg.

Because the sentence begins with a si-clause:

• Si rompes la cáscara con cuidado, ...

In Spanish, when this conditional clause comes first, it is normal to separate it from the main clause with a comma.

So the structure is:

• Si + condition, result

This is similar to English:

• If you break the shell carefully, the yolk comes out whole.

Yes, that is grammatically correct.

• La yema sale entera si rompes la cáscara con cuidado.

It means the same thing. The difference is mostly one of focus and style.

• Starting with Si rompes... emphasizes the condition first.
• Starting with La yema sale entera... emphasizes the result first.

Both are natural.

Grammatically, it is a statement, not a command.

It uses the present tense:

• rompes
• sale

So it literally gives a general fact or rule:

• If you break the shell carefully, the yolk comes out whole.

However, in real life it can also function like practical advice.

If you wanted a direct command, Spanish would sound different, for example:

• Rompe la cáscara con cuidado para que la yema salga entera.

That is more explicitly instructive.