A student wants to demonstrate the law of conservation of mass during a chemical reaction. They find the mass of their initial reactants to be 52 grams. They conduct the reaction in a
beaker, and notice bubbles being produced in the reaction. At the conclusion of the reaction,
they find the mass of the products to be 46 grams. Based on their observations, which of the
following most likely explains the apparent change in mass?
A. The student made a mistake measuring the reactants.
B. The student conducted the reaction in an open beaker, which allowed one of the products, a
gas, to escape.
C. The student accidentally conducted a nuclear reaction in the beaker, and actually did destroy
matter by converting it into energy.
D. Conservation of mass is only a theory, and may be wrong.

For a family dinner, jose’s mom baked a loaf of bread. during the meal, his grandmother commented, “this bread is so dense! ” what do you think his grandmother meant by the word dense? you have some ideas regarding density already, but this experiment will enrich your understanding of the relationship between mass, volume and the density of objects. when making measurements in this experiment we will be using si units, the international system of units. the purpose of using si units is to have the ability to communicate and compare data results with other experiments without having to make conversions. measurement symbol si unit length m meter mass kg kilogram volume l liters density kg/l kilograms per liter any calculations that are performed during this experiment will ultimately be reported in scientific notation. recall that scientific notation is extremely important when we have data that is extremely small or large. scientists rely on a standard form of communication to quickly make hypotheses and judgements based on data. what is the density of block a? a0kg/l what is the density of block b? a1kg/l what is the density of block c? a2kg/l what is the density of block d? a3kg/l what is the density of block e? a4kg/l which block is the densest? a5