Across
- 6. Chemical energy is converted to electrical energy at a power plant. A light bulb converts that electrical energy to what two new forms?
- 9. the periodic table is organized based on this property
- 15. substances that are made up of entirely of one kind of atom
- 17. shiny, malleable, ductile, good conductors
- 18. energy is never created or destroyed
- 21. temperature is a measurement of this
- 25. to change from a liquid to a solid thermal energy must be _______________
- 26. mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction
- 27. The formula for a sulfuric acid molecule is H2SO4. How many atoms are in each molecule?
- 28. dissolving is an example of this
- 29. caused by an increase or decrease in thermal energy
- 31. In exothermic reactions potential energy ______________
- 33. in an endothermic reaction ___________ have more energy than reactants
- 35. composed of protons and neutrons
- 37. Reactant → Product + ___________________; true of an exothermic reaction
- 38. a huge molecule with hundreds and sometimes thousands of atoms per molecule
Down
- 1. original substances are rearranged into new substances with different properties from the original substances
- 2. in this type of reaction it takes more energy to break the bonds of the reactants than what is released to form the products
- 3. the atomic number of sodium
- 4. in an endothermic reaction the _____________gains energy
- 5. stored energy due to the position or shape of something
- 7. a row in the periodic table
- 8. found to the right of the metalloids
- 10. a type of potential energy, stored in food
- 11. the element found in period 3 and group 16
- 12. evidence that a chemical change has taken place
- 13. group that contains the most un-reactive elements, group 18
- 14. in an exothermic reaction the temperature of the surroundings __________________
- 16. an example of an endothermic reaction
- 19. an example of a synthetic polymer
- 20. elements that share similar characteristics are found here
- 22. type of energy stored in the bonds between atoms of molecules
- 23. those on the outermost shell; included with the Lewis dot diagram
- 24. In an endothermic reaction potential energy ______________
- 28. charge of the nucleus
- 30. most of the atom is _______________ ______________
- 31. describes the nucleus of the atom
- 32. to find the number of neutrons ___________ the atomic number from the atomic mass
- 34. an example of a natural polymer
- 36. subatomic particles that have about the same mass