What does the statement "Mass is conserved during a chemical reaction" mean?

Rocks formed by changes in heat and pressure or the presence of hot, watery fluids

Atom neutral subatomic particle found in the nucleus of the atom 2. elements the smallest whole unit of matter 3. radioactive elements negatively charged, subatomic particle 4.

To make a table of the elements, dimitri Mendeleev sorted the elements according to their?

Mass Volume Density Give two examples of common units for each of the above measurements

Energy from sources that are constantly being formed is non-renewable energy. a. True b. False

When electrons are removed from the outermost shell of a calcium atom, the atom becomes A) an anion that has a larger radius than the atom. B) an anion that has a smaller radius than the atom. C) a cation that has a larger radius than the atom.

A molecule of an unsaturated hydrocarbon must have 1) at least one single carbon-carbon bond 2) at least one multiple carbon-carbon bond 3) two or more single carbon-carbon bonds 4) two or more multiple carbon-carbon bonds

A 8.85 g sample of hydrate of sodium carbonate, Na2CO3 ∙ XH2O was heated carefully until no more mass was lost from the sample. After heating, the final weight of the material was 7.55 g. How many moles of water left the compound? 0 moles

PF3Br2 is a nonpolar molecule. Based on this information, determine the F-P-F bond angle, the Br-P-Br bond angle, and the F-P-Br bond angle. Enter the number of degrees of the F-P-F, Br-P-Br, and F-P-Br bond angles, separated by commas (e. g.

Using your periodic table identify the radioactive isotope;