A sample of the Earth’s crust was found to contain over 80% of a material called silicon dioxide. The sample had a volume of 15 cm3 and the mass of the sample was 39.75 grams. What is the density of silicon dioxide?

Yes it would be a physical change.

In reversible reaction chemistry equilibrium is attained when the forward and reverse reactions are taking place at the same rate, thus, the concentrations of reactants and products remain the same. a reversible reaction is a chemical reaction where the reactants form products that, in turn, react together to give the reactants back. in irreversible reactions on the other hand, the reactants react to form the products, which cannot revert back into reactants.

Answermilliliters and cubic centimeters;