Learn Russian: Холодильник на кухне. - The refrigerator is in the kitchen.

In Russian, the present tense of the verb to be is almost always left out. You simply state the subject (холодильник) directly followed by its location (на кухне).

Why does this sentence use the preposition на instead of в for 'in'?

While enclosed rooms usually take в (meaning in), the word for kitchen (кухня) is a traditional exception. You must always use на with it, so на кухне is the correct way to say in the kitchen.

Why does the word for kitchen end in -е instead of -я here?

When talking about a location using в or на, the following noun must be in the Prepositional case. For feminine nouns that normally end in -я like кухня, this ending changes to -е, resulting in кухне.