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Here are a few general guidelines to keep in mind:
Whenever possible use inexpensive materials teachers and students can easily
find at home or school. This supports student reproduction of
your lesson on their own time and independent experimentation and play.
Always rehearse or try the experiment yourself - even if you
are trying one from a book. If possible have a
student in the age group you are preparing for try it.
In the least try to get a friend or family member
who has never seen the experiment to try it. You are
already familiar with the experiment and may make assumptions another person
reading the instructions for the first time will not understand.
Bring all the materials you will need including enough copies of
instructions or any documents you'll need. Do not assume that
the teacher will be able to make copies or provide any
materials (even though they will probably be very happy to help you out).
If you intend to bring materials for each student (or
teams of students) divide your materials into "kits". Using
small sealable plastic bags, small stackable cardboard or plastic boxes
or the new disposable plastic food containers, separate your project
materials and the tools needed (tape, safety scissors)
into these containers.
Thirty-five students in
a class is not unusual, although in some states
class sizes for the lower elementary grades are limited to 20.