Across
- 4. formula A chemical formula is a way of expressing information about the proportions of atoms that constitute a particular chemical compound.
- 5. a substance that takes part in and undergoes change during a reaction.
- 7. An electron in an outer shell of an atom that can participate in forming chemical bonds with other atoms.
- 8. 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.
- 10. when objects or substances undergo a change that changes the physical form of a composition but not the chemical composition.
- 11. A chemical bond is a lasting attraction between atoms that enables the formation of chemical compounds.
Down
- 1. the result of a chemical reaction.
- 2. The noble gasses make a group of chemical elements with similar properties.
- 3. A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulas.
- 6. when a substance combines with another to form a new substance.
- 9. The alkali metals are a group of elements in the periodic table.They are all in the They are extremely reactive.