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https://www.stevespanglerscience.com/lab/experiments/sinking-soda-surprise/

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This experiment allows students to visually see and explore the idea of density. This exploration touches on quite a few specific expectations, as stated previously, and could act as a good "Minds On" activity at the start of a lesson. This experiment also could be used as a segue into a discussion about the negative health effects of added sugar and the "weight" they not only add to the drinks they sweeten but often to the people who consume them.

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Grade 8 - UNDERSTANDING MATTER AND ENERGY (FLUIDS):
2.3 investigate and compare the density of a variety of liquids (e.g., water, salt water, corn syrup, liquid soap)
3.2 describe the relationship between mass, volume, and density as a property of matter
3.5 determine the buoyancy of an object, given its
density, in a variety of fluids (e.g., less dense
objects float, more dense objects sink)

Extension for a subsequent lesson:
3.3 explain the difference between solids, liquids,
and gases in terms of density, using the particle theory of matter (e.g., in general, solids are
more dense than liquids, which are more dense
than gases)

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Read ahead for the specific expectations that this experiment covered.

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Because some of the pop types used in this experiment are sweetened with sugar, the sugar adds to their mass and makes them more dense than the water they were placed in - this is why they sink! The diet pop or unsweetened drinks float because they are less dense than water - they have dissolved CO2 (carbon dioxide) gas in them and have a small air space at the top of the can, which them slightly less dense than water. While the regular pop cans also have dissolved CO2 and a small air space, the added mass of the sugar pushes their density to heavier than that of water.

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https://www.thecalculatorsite.com/articles/math/density-formula.php

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Why some of the cans sink and some do not is because of something called DENSITY. Density is the mass of an object divided by its volume, or the measure of mass per unit of volume. Mass is the amount of matter that is in an object and is commonly referred to as how much an object weighs. Volume is how much space that object or substance occupies.

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- Regular pop (sweetened with sugar) sinks
- Diet pop/unsweetened carbonated drinks float

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Place the rest of the cans in the water and see what each of them do (sink or float). Record each of the results.

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Place one of the cans in the water. Does it foat or sink? Record your data.

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Fill the tub with water, almost all the way to the top.

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Gather your materials

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Before we move on to how to conduct the experiment, please comment on this post what your hypothesis is. Do you think the cans of pop will float? Sink? Some of each?

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- Ask an adult if you need help filling or carrying the tup when it is full of water
- Clean up spills immediately so they do not become a slipping hazard
- Do NOT drink the pop cans

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You will need:
- A clear tub or container that is deeper than a can of pop
- Water (to fill the tub)
- At least one regular pop can and one diet pop can

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Welcome, Grade Eights! Today we are doing an experiment involving something we are probably all familiar with - pop!

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Welcome, Grade Eights! Today we are doing an experiment involving something we are probably all familiar with - pop!