Across
- 3. a chemical reaction in which two or more simple substances combine to form a new, more complex substance
- 5. a chemical substance that is present at the start of a chemical reaction
- 6. a pure substance that cannot be broken down into simpler substances by physical or chemical means
- 8. a multiplier or factor that measures some property
- 9. a substance made up of atoms of two or more different elements joined by chemical bonds
- 11. when substances interact and change into new substances
Down
- 1. A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound
- 2. a process during which chemical bonds between atoms are broken and new ones are formed. Producing one or more different substances
- 4. in any physical change or chemical reaction, mass is conversed; mass can be neither created nor destroyed
- 7. a group of atoms bonded together
- 10. a chemical substance formed as a result of a chemical reaction