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Across 1. the formula for density is ______ divided by volume (Fact 183) 5. during a chemical reaction, chemical bonds between atoms are ______ and new ones are formed (Fact 277) 7. any substance with a density of less than or equal to one will ______ when placed in water (Fact 189) 9. nucleic acids are biochemicals found in living organisms that store information and help to build _______ and other nucleic acids (Fact 308) 13. _______ is the application of knowledge, tools and materials to solve problems and accomplish tasks (Fact 5) 14. physical science is the study of matter and ____ (Fact 6) 15. the S.I. unit of mass is the ____ (Fact 65) 16. ______ on Earth are caused mainly by differences in how much the moon's gravity pulls on different parts of the Earth (Fact 169) 17. living organisms require smaller molecules of water,salts, _______ and minerals to support the functioning of larger molecules (Fact 310) 19. there are two types of ____ _____, DNA and RNA (Fact 309) 22. most ______ are solid at room temperature, are good conductors of heat and electricity, are shiny and have high melting points (Fact 258) 27. a ____ _____ occurs when the Earth moves in between the sun and the moon and blocks sunlight from reaching the moon; the shadow of the Earth falls on the moon (Fact 167) 28. ______ is the amount of matter in an object or substance (Fact 63) 29. Another name for the manipulated variable (the variable that is purposely changed) is the _______ variable (Fact 22 30. any substance with a density of greater than ____ will most likely sink when placed in water (Fact 190) 31. the SI unit of force is the ______ (Fact 87) 32. the solar system formed form a large cloud of dust and ____ called the solar nebula(Fact 130) 33. _______ are used by living organisms as an energy source and for energy storage (Fact 303) 34. ______ or fats are biochemicals made of carbon, hydrogen, and phosphorus (Fact 304) 35. a ____ _____ is the process by which one or more substances undergo change to produce one or more new and different substances (Fact 275)

Down 2. proteins are used by living organisms to regulate chemical activities within the organism, to transport and store materials, and to provide ______ (Fact 307) 3. most elements are metals; metals are _______ (can be drawn into a wire) and malleable (can be pounded into thin sheets) Fact 259 4. ______ is the amount of space something occupies (Fact 51) 6. ______ surfaces create more friction than smoother surfaces (Fact 101) 8. ________ are atoms from a particular element that have the same number of protons but a different number of neutrons (Fact 252) 10. _____ are dull, poor conductors of heat and electricity and are brittle (break easily) Fact 260 11. a _____ ______ occurs when the moon comes in between the Earth and the sun and blocks sunlight from reaching the Earth; the shadow of the moon falls on the Earth (Fact 168) 12. each proton has a mass of 1 amu, each ______ has a mass of 1 amu and each electron has a mass of 0 amu (Fact 248) 18. Another name for the ______ variable(the variable that is expected to change because of the manipulated variable) is the dependent variable (Fact 23) 20. the volume of a gas is equal to the volume of its closed ______ (Fact 62) 21. lipids are used by living organisms to store excess energy (as fat) and for making up _____ ______ (Fact 305) 23. the formula used to calculate _____ _____ is distance divided by time (Fact 77) 24. a ______ ______ is the force of attraction that holds two atoms together as a result of the rearrangement of electrons between them (Fact 276) 25. the _____ of an atom holds the protons and neutrons and has a positive charge (Fact 244) 26. proteins are biochemicals made of ____ _____ (Fact 306)