Across
- 5. a substance that takes part in and undergoes change during a reaction.
- 7. Metals- The alkali metals are a group of elements in the periodic table. They are all in the
- 8. electrons- An electron in an outer shell of an atom that can participate in forming chemical bonds with other atoms.
Down
- 1. change- Physical changes occur when objects or substances undergo a change that changes the physical form of a composition but not the chemical composition.
- 2. the result of a chemical reaction.
- 3. column of the periodic table. They are extremely reactive.
- 4. equation- A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulas.
- 6. of Conservation of Mass- The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as system mass cannot change quantity if it is not added or removed. Hence, the quantity of mass is "conserved" over time.
- 9. Gases- The noble gases make a group of chemical elements with similar properties. Under standard conditions, they are all odorless, colorless, monatomic gases with very low chemical reactivity. The six noble gases that occur naturally are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and the radioactive radon (Rn).