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Across 2. the substances formed in a chemical reaction are called _________ (Fact 283) 5. a ______ ______ is an object that appears to stay in place in relation to an object being observed for motion (Fact 9. the ____ _____ of an atom is equal to the sum of its protons and neutrons (Fact 251) 13. all nonmetals except for _______ are found to the right of the zigzag line and most are gases at room temperature (Fact 267) 14. a _____ ______ is a shorthand way to use chemical symbols and numbers to represent a substance (Ex CO represents carbon dioxide ) (Fact 278 16. A ______ ______ use chemical symbols and formulas as a short way to describe a chemical reaction (Fact 280) 18. the _______ produces energy through nuclear fusion (Fact 135) 21. the ________ materials in a chemical reaction are called reactants (Fact 282) 24. the ______ ______ is equal to the number of protons in the nucleus of an atom (Fact 250) 25. the ______ of a line graph tells how much the responding variable changes for every change in the manipulated variable (Fact 39) 29. _______ are atoms from the same same element that have the same number of protons but a different number of neutrons (Fact 252) 30. particles in a _________ are broken apart, move independently of each other, conduct electrical current and aren't affected by magnetic fields (Fact 224) 31. melting, vaporization, and sublimation are _______ changes of state during which heat energy is absorbed and particle motion increases (Fact 235) 32. a _______ is a pair of numbers used to determine the position or a point on a line graph (Fact 34)

Down 1. the formula for density is mass divided by volume (Fact 183) 3. in a chemical reaction, the number and type of atoms does not change, they are simply _______ (Fact (Fact 284) 4. The law of ______ of mass states that mass (matter) is neither created or destroyed during ordinary physical or chemical changes (Fact 285) 6. condensation, freezing and *deposition are ______ changes of state during which heat energy is released and particle motion decreases (Fact 238) 7. A _______ _____ is the process by which two or more substances undergo change to produce one or more new substances (Fact 275) 8. _______ are found to the left of the zigzag line on the Periodic Table (Fact 246) 10. during a ______ _______ the moon moves in between the Earth and the sun and the shadow of the moon falls on the Earth (Fact 168) 11. _______ border the zigzag line on the Periodic Table and there are only six of them (Fact 268) 12. a ________ is a scientist's best prediction about the answer to a question or solution to a problem; a good one must be testable (Fact 18) 15. during a ______ _____ the Earth moves in between the moon and the sun and the shadow of the Earth falls on the moon (Fact 167) 17. Each element is represented by a one, two or three letter _____ ______, the first letter is always upper case, the other(s) must be lower case (Fact 265) 19. ________ forces produce no change in the motion of an object (Fact 94) 20. A ______ _______ is the force of attraction that holds atoms together as a result of the rearrangement of electrons between them (Fact 276) 22. particles in a ______ can move together or far apart; they move independently of each other, collide often and can completely break the attractions between them (Fact 222) 23. ________ forces cause a change in the velocity (speed and direction) in moving objects; these forces also cause static objects to start moving (Fact 99) 26. moving particles create ______ by colliding with one another and the walls of their container (Fact 193) 27. particles in a _________ are tightly packed together, vibrate in place, and are strongly attracted to each other (Fact 217) 28. particles in a ________ are loosely connected, can slide past each other and can move fast enough to break some of the attraction between them (Fact 220)