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.

B. The student conducted the reaction in an open beaker, which allowed one of the products, a  gas, to escape.

Explanation:

Based on the law of conservation of mass, matter is neither created nor destroyed during the course of a chemical reaction.

By this premise, the mass of reactants and products must remain the same during the course of a reaction.

po-215 i got it right on the quiz

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).