Across
- 2. A substance that takes part in and undergoes change during a reaction.
- 4. A substance produced during a chemical reaction
- 5. There are ___ chemical reactions.
- 8. A chemical reaction that releases heat
- 11. Method or means of changing one or more chemicals or chemical compounds.
- 14. A chemical reaction that absorbs heat
- 15. A substance that takes part in and undergoes change during a reaction
- 16. A solid that forms from a solution during a chemical reaction.
- 17. An unexpected change in _______ is a sign that a chemical reaction may have occurred.
- 19. Substance(s) produced during a chemical reaction.
- 21. Average kinetic energy of all the particles in a material; measured by a thermometer in degrees(usually Celsius or Fahrenheit)
- 22. Chemical formulas and symbols written to represent a reaction; (reactants) →(products).
- 23. Substances giving off a smell, or _______, while being combined is also an indicator of a chemical reaction.
- 24. A change in a substance that does not involve a change in the identity of the substance
Down
- 1. Physical and chemical characteristics of matter used to describe or identify a substance.
- 3. Smallest particle of an element
- 6. A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction
- 7. The process by which one or more substances change to produce one or more different
- 9. Increase or decrease and the production of light are both signs that a chemical reaction may have occurred.
- 10. A substance made up of atoms of two or more different elements joined by chemical bonds
- 12. A combination of chemical symbols and numbers to represent a substance
- 13. Distinct forms of matter known in everyday experience: include solid, liquid, and gas; also referred to as phases
- 18. two or more atoms held together by chemical bonds
- 20. A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound.