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Across 1. ________ changes when speed or direction changes (Fact 81) 3. the formula for finding _____ is density x volume (Fact 184 8. scientists make ________ when they used their senses to gain information (Fact 14) 9. an organic compound is a compound that contains the element ______ (Fact 296) 13. ______ acceleration occurs when an object moves at a constant speed in circular direction; this occurs when a Ferris wheel turns at an amusement park (Fact 85) 15. the substances formed in a chemical reaction are called ______ (Fact 283) 16. metalloids are called _____ ______ and have properties of both metals and nonmetals (Fact 261) 17. the number of _______ in the nucleus of an atom is the atomic number; the atomic number identifies the atoms of a particular element (Fact 250) 20. _______ is when a liquid changes to a gas (Fact 231 22. ______ are dull, poor conductors of heat and electricity, and are brittle (break easily) (Fact 260) 23. most elements are ________; these elements are ductile (can be made into a wire) and malleable(can be pounded into thin sheets) (Fact 259) 26. a moon is a natural satellite that orbits a planet; Mercury and _____ are the only planets that do not have any moons (Fact 145) 27. a ______ change is a change that occurs when one or more substances are changed into entirely new substances with different properties (Fact 213) 28. sugars, ________, oils, proteins and nucleic acids are examples of organic compounds (Fact 297) 29. for an object to float, the upward acting buoyant force must equal the downward force of _______ (Fact 198)

Down 2. in a _____ _____, the number and kind of atoms does not change, they are simply rearranged (Fact 284) 4. _______ is when a solid changes directly to a gas without passing through its liquid state first (Fact 234) 5. a _______ is made of two or more elements chemically combined (Fact 274) 6. the starting materials in a chemical reaction are called _______ (Fact 282) 7. scientists make _______ or reasoned judgments to explain observations (Fact 15) 9. _______ is when a gas changes to a liquid (Fact 236) 10. the ____ _____ of an atom is equal to the sum of its protons and neutrons (Fact 251) 11. a _______ change is a change that affects one or more physical properties of a substance; a substance that undergoes this type of change is still the same substance (Fact 212) 12. ______ is the sixth planet from the sun, is the second largest planet, is the least dense planet, and has the largest rings of all the gas giants (Fact 157) 14. ______ is the seventh planet from the sun, has at least 27 moons, and is tipped on its side (Fact 158) 18. _______ (semi metals) border the zigzag line on the Periodic Table; there are only 6 elements in this category (Fact 268) 19. a falling object is said to be in ____ _____ when only the force of gravity is pulling it down; this occurs when there is no air (outer space) (Fact 116) 21. the formula for finding ______ is mass divided by density (Fact 185) 24. an _________ is a pure substance that cannot be separated into simpler substances by physical or chemical means (Fact 254) 25. ______ is the fourth planet from the sun, is known as the Red Planet, has a lot of volcanic activity (Fact 149)