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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c, liquids evaporate, creating a gas

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.