![]() Note that the percentages may not add to 100% due to rounding amounts and excluding less significant elements. Taping shut the bottles when you are done can help to ensure that no food items escape into the classroom if this is a concern, as well as discourage students from opening the bottles, which may disrupt the activity and ruin the bottles for use at future events.įor each source, the recipes give the abundance (in %) and the volume of each element required in drymeasured cups (C), tablespoons (tbsp), and teaspoons (tsp). In each set, label each bottle with a number correlating to a specific source, and then record the key for later identification (ex. plastic bottles, available from many online suppliers). Place each mixture into a separate jar or bottle (these recipes are scaled for 8 oz. For a group of 25 students, that would be 6-8 bottle sets. The more sets you have, the smaller the group students can work in. The number of bottle sets that you make is somewhat discretionary. Because these items are approximately the same size, using dry measurements (volume) is very roughly equivalent to measuring numbers of atoms. Note that these abundances are by volume, not weight. Prepare mixtures of these items according to the recipes below for the sources we are modeling. In this activity, each element is represented by a different food. 1 scoop of pink, purple, red, and yellow beads in roughly equal amounts (to represent 0.01% abundance of magnesium, silicon, iron, and sulfur together).1 scoop of orange beads (to represent 0.01% abundance of neon).1 scoop of green beads (to represent 0.01% abundance of nitrogen).2 scoops of black beads (to represent 0.03% abundance of carbon).3 scoops of dark blue beads (to represent 0.08% abundance of oxygen).5 scoops of light blue beads (to represent 9% abundance of helium). ![]() 50 scoops of clear beads (to represent 90% abundance of hydrogen in universe).Using the same, or larger, size "measuring cup" for preparation as the students will each have during the activity. Mix the ingredients ahead of the planned activity in a large bowl. In this activity, each element is represented by a different color of bead. Clay (or Sculpey, for a more permanent model) of 5 or more different colors. ![]()
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