Please help me with my 8th grade chemistry, I'm behind and don't understand it at all
When copper metal is heated, a chemical reaction occurs which results in the copper metal gaining a small amount of additional mass. Given that the Law of Conservation of Mass states that matter can neither be created nor destroyed, what is the best explanation for the increase in mass of heated copper metal?
a. The heated copper metal changes into a different type of metal.
b. Copper atoms are destroyed during the heating process.
c. Oxygen atoms in the air combine with the copper atoms as it is heated.
d. Mass is created as the copper metal was heated.

When a material is heated, the kinetic energy of that material increases and its atoms and molecules move about more. This means that each atom will take up more space due to its movement so the material will expand. ... Some metals expand more than others due to differences in the forces between the atoms / molecules.

determine whether density can be classified as an intensive property. Examples of intensive properties include color, temperature, hardness, and density. In this lab density, the compactness of a substance, will be calculated for aluminum. Then by examining if the density is constant in five trials, which use various amounts of aluminum, the conclusion of whether density is indefinitely an intensive property for solid states of matter can be made.utilize two ionic compounds and facilitate a precipitation reaction in order to observe how the Law of Conservation of Mass applies to chemical processes, specifically, precipitation reactions

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why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.

a polar bond is formed when electrons are shared unevenly between atoms