Across
- 3. A group of chemical elements with similar properties. Under standard conditions, they are all odorless, colorless, monatomic gases with very low chemical reactivity.
- 5. This occur when a substance combines with another to form a new substance, called synthesis or, alternatively, decomposes into two or more different substances.
- 7. The result of a chemical reaction.
- 9. A group of elements in the periodic table. They are all in the first column of the periodic table, and they are extremely reactive.
- 10. This 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.
Down
- 1. An electron in an outer shell of an atom that can participate in forming chemical bonds with other atoms.
- 2. The symbolic representation of a chemical reaction in the form of symbols and formulas.
- 4. This occur when objects or substances undergo a change that changes the physical form of a composition but not the chemical composition.
- 5. A lasting attraction between atoms that enables the formation of chemical compounds.
- 6. A way of expressing information about the proportions of atoms that constitute a particular chemical compound, using a single line of chemical element symbols.
- 8. A substance that takes part in and undergoes change during a reaction.