What does "~ kana" mean at the end of sentence in Japanese?

What is "kana" and how and why is it used in the Japanese language?

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During your time reading Japanese, you may have noticed several sentences ending with "kana." What exactly does Kana mean? How does it translate into a sentence? Here's the basic breakdown: 

When you see Kana at the end of a sentence, it is essentially inferring the English equivalent of "I wonder." It's a relatively casual expression, and used quite often in conversation. 

Here are some examples:

Ashita yuki ga furu kana.
明日雪が降るかな。
I wonder if it will snow tomorrow.
Ano hito wa supein-jin kana.
あの人はスペイン人かな。
I wonder if he/she is Spanish. 

"~ kashira (~かしら)" can be replaced with "~ kana", though it is used only by females.

Kore ikura kashira.
これいくらかな。
I wonder how much it is.
Dou shita no kashira.
どうしたのかしら。
I wonder what happened.

Here are some more phrases with "~ kana" from my "Phrase of the Day" lessons.

Nani o kite ikou kana.
何を着ていこうかな。
What shall I wear?
Mattete kureru kana.
待っててくれるかな。
I wonder if he/she will wait for me.
Machiawase-basho machigaeta kana.
待ち合わせ場所間違えたかな。
I wonder if I am waiting 
in the wrong place.
Okane, ato ikura nokotteru kana.
お金、後いくら残ってるかな。
I wonder how much money I have left.
.
来年はいいことあるかな。
I wonder if next year will bring 
something good.