Crossword 4 by Remi

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Across
  1. 2. The law of ______________ of mass states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so quantity can neither be added nor be removed. Therefore, the quantity of mass is conserved over time.
  2. 6. It is both a property of a physical body and a measure of its resistance to acceleration (a change in its state of motion) when a net force is applied.
  3. 12. is a low density metal that is a chemical element with the symbol Al and atomic number 13.
  4. 14. Atomic ________ or atomic spacing refers to the distance between the nuclei of atoms in a material.
  5. 16. Chemical ________________is the process or effect of simplifying a single chemical entity (normal molecule, reaction intermediate, etc.) into two or more fragments.
  6. 17. A chemical compound with one atom of carbon and four atoms of hydrogen, that is the main constituent of natural gas.
  7. 18. The composition or combination of parts or elements so as to form a whole, or the production of a substance by the union of chemical elements, groups, or simpler compounds.
  8. 19. is the lightest and most abundant chemical element in the known universe with the symbol H and atomic number 1.
Down
  1. 1. During a chemical reaction reactants are transformed into __________ after passing through a high energy transition state.
  2. 3. The smallest unit of ordinary matter that forms a chemical element.
  3. 4. The ________________scale is the length scale on which objects or phenomena are large enough to be visible with the naked eye, without magnifying optical instruments. It is the opposite of microscopic.
  4. 5. The _____________ mass is the mass of an atom.
  5. 7. The calculation of reactants and products in chemical reactions in chemistry.
  6. 8. is a highly reactive chemical element with the symbol P and atomic number 15.
  7. 9. The loss of electrons or an increase in the oxidation state of an atom, an ion, or of certain atoms in a molecule.
  8. 10. Substances consumed in the course of a chemical reaction.
  9. 11. When each side of the chemical equation represents the same quantity of any particular element and same charge is present on both sides, then it is a __________ equation. reaction A chemical______________ is a process that leads to the chemical transformation of one set of chemical substances to another.
  10. 12. The ____________ constant is the proportionality factor that relates the number of constituent particles in a sample with the amount of substance in said sample.
  11. 13. The unit of measurement for amount of substance in the International System of Units.
  12. 15. A ____________ system is a physical system that does not allow transfer of matter in or out of the system.