Many ZOOM into Engineering (elementary and middle school level) experiments are available in Spanish in addition to English. See http://pbskids.org/zoom/printables/activities/ and look for the ESP designation. This site provides handouts in PDF format that you can print out and take to the classroom. All of the instructions are included, just check and see what supplies you will need and your visit is practically planned! Some example are attached below.

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v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}

These experiments are suitable for middle school students.