Questa razza è molto calma.

Because razza is a feminine singular noun, and questo/questa must agree with it.

• questo = this, masculine singular
• questa = this, feminine singular

So:

• questo cane = this dog
• questa razza = this breed

Italian words like this often change form depending on the noun’s gender and number.

Because calma is an adjective describing razza, and in Italian adjectives usually agree in gender and number with the noun they describe.

Since razza is feminine singular, the adjective is also feminine singular:

• calmo = calm, masculine singular
• calma = calm, feminine singular
• calmi = calm, masculine plural
• calme = calm, feminine plural

So:

• Questo cane è molto calmo.
• Questa razza è molto calma.

The accent is very important. È with an accent means is.

• è = is
• e = and

So:

• Questa razza è molto calma. = This breed is very calm.
• questa razza e molto calma would be incorrect.

In writing, always keep the accent on è.

Here molto means very, so it is being used as an adverb modifying the adjective calma.

When molto means very, it does not change:

• molto calmo
• molto calma
• molto belli
• molto interessante

But molto can also be an adjective meaning much/many, and then it does change:

• molto tempo = much time
• molta pazienza = much patience
• molti cani = many dogs
• molte razze = many breeds

In your sentence, it is an adverb, so molto stays the same.

Not always. Razza can mean different things depending on context.

Common meanings include:

• breed for animals
• race in some contexts

In a sentence like Questa razza è molto calma, the natural meaning is usually breed, especially if you are talking about dogs, cats, or other animals.

So context matters a lot.

This is the normal Italian pattern:

subject + form of essere + adverb + adjective

So:

• Questa razza = subject
• è = is
• molto = very
• calma = calm

This is very similar to English: This breed is very calm.

Italian word order is often flexible, but this version is the most neutral and natural.

Yes. That is also correct, but it means something slightly different in structure.

• Questa razza è molto calma. = This breed is very calm.
• Questa è una razza molto calma. = This is a very calm breed.

The first sentence directly talks about the breed.
The second introduces something as a calm breed.

Both are natural; they just focus a little differently.

You need to change the demonstrative, noun, verb, and adjective so they all agree.

Singular:

• Questa razza è molto calma.

Plural:

• Queste razze sono molto calme.

Changes:

• questa → queste
• razza → razze
• è → sono
• calma → calme

Italian agreement is one of the key things to watch for.

The adjective and demonstrative would change to match the masculine noun.

For example, with cane:

• Questo cane è molto calmo.

Changes:

• questa → questo
• calma → calmo

The verb è stays the same because the subject is still singular.

Razza is pronounced roughly like RAHT-tsa.

A few useful pronunciation points:

• zz in Italian often sounds like ts or dz, depending on the word and accent
• the double zz should be pronounced more strongly than a single consonant
• the stress is on the first syllable: RÀZ-za

And calma is pronounced roughly KAHL-ma.

No. Italian usually does not need a separate subject pronoun when the subject is already stated.

• Questa razza è molto calma. is complete and natural.

Adding a pronoun would usually be unnecessary. Italian normally avoids pronouns unless you want emphasis or contrast.

So the sentence is perfectly normal as it is.