Across
- 5. A scientific vocabulary for a chemical reaction that releases heat energy to the surrounding environment
- 7. The raw materials in a chemical reaction
- 12. A property of substances that break when bent or hit
- 15. An element in the periodic table with an element symbol of F
- 18. A compound of one hydrogen atom and one chlorine atom
- 20. A substance which is made of two or more elements that are chemically bonded together
- 22. A law that states that in any closed system, matter is neither created nor destroyed during a chemical reaction or a physical reaction
- 27. A scientific vocabulary for a chemical reaction that absorbs heat energy from the surrounding environment
- 30. Synonym of the outermost shell in atoms
- 31. The burning of a substance in the presence of oxygen
- 32. An uncharged subatomic particle
- 34. Two substances are formed during combustion, which are water and _____________.
- 35. Set group of two or more atoms joined together
- 38. Elements that exist as one atom
- 40. A subatomic particle that has the same mass as the neutron
Down
- 1. A compound of two hydrogen atoms, one sulfur atom and four oxygen atoms
- 2. A property of substances that can be hammered or bent into different shapes without shattering
- 3. The temperature at which a substance melts
- 4. The new substances created after the reaction has occured
- 6. The rows in the periodic table
- 8. A Danish physicist that developed the Nuclear Model in 1913
- 9. The columns in the periodic table
- 10. The creator of the periodic table
- 11. Three things that are required for combustion to happen is oxygen, heat, ____.
- 13. A scientific vocabulary for fizzing or bubbling
- 14. contains different kinds of atoms jumbled up but not joined together
- 16. An element in the periodic table with an element symbol of C
- 17. Physical changes are often easily _________.
- 19. A ceramic container in which metal or other substances can be melted into very high temperatures
- 21. Breaking down complex substances into simpler substances
- 23. ___ substances are formed
- 24. A substance that can't be broken down into any other substances
- 25. The simplest particle of matter, which we think of as being like a tiny ball
- 26. The direction of the first electron in each shell
- 28. Elements that exist as two atoms
- 29. A subatomic particle that its mass is usually treated as zero
- 33. Elements in group 0 of the periodic table that are nonreactive due to their complete valence shells
- 36. Different atoms of the same element that contain the same number of protons but a different number of neutrons
- 37. Scientific vocabulary for nonreactive
- 39. An element in the periodic table with an element symbol of K