Why do chocolate chips melt in your hand but not in the oven?

Chocolate will melt in an oven.

You can melt chocolate in a dry oven. Place grated chocolate in a metal bowl and place it in an oven set at 110° F (if your oven doesn't go that low, use the lowest temperature and keep the door ajar). Your chocolate will melt in about an hour.

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fabulousfoods.com/index.php?option=com_resource&controller=article&category_id=224&article=19935 webpage no
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Chocolate chips are small rounds (1/8 to 1/2 inch) (.6 to 1.25 cm) of semi-sweet, milk or white chocolate that contain less cocoa butter than other chocolates. They are made to withstand moderate oven heat so they retain their texture and shape in cookies, muffins, and other baked desserts without appearing to melt (even though the cocoa butter has melted). It is not a good idea to use chocolate chips in recipes than call for melted chocolate as the chocolate chips when melted become chocolate that is thick, muddy and grainy that is very difficult to use. This is because of the smaller amount of cocoa butter (25-30%) in the chocolate chips.

http://www.joyofbaking.com/ChocolateChips.html