Across
- 4. A group of chemical symbols and numbers that represent the elements and the number of atoms of each element that make up a compound.
- 5. More energy is required to break the bonds of the reactants than is released when products form.
- 6. Law that states that energy is always transferring, but energy is not created or destroyed.
- 7. A small particle that is the building block of matter.
- 8. A process in which atoms of one or more substances rearrange to form one or more new substances.
- 10. A change in matter in which the substabnces that make up the matter change into other substances with different chemical and physical properties.
- 12. Matter with a composition that is always the same.
- 13. A number placed in front of an element symbol or chemical formula in an equation.
- 14. Two or more atoms that are held together by covalent bonds and act as a unit.
- 16. A starting substance in a chemical reaction.
- 18. A substance produced by a chemical reaction.
Down
- 1. A characteristic of matter that can be observed as it changes to a different type of matter.
- 2. The energy released when atoms form bonds.
- 3. Law that states that the total mass of the reactants before a chemical reaction is the same as the total mass of the products after the chemical reaction.
- 9. A characteristic of matter that can be observed or measured without changing the identity of the matter.
- 11. A substance that consists of only one atom.
- 15. More energy is released when the products form than is required to break the bonds in the reactants.
- 17. A substance containing atoms of two or more different elements chemically bonded together.