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Across 6. the SI unit for the volume of a liquid is the ____ (Fact 57) 7. all of the ____ ____ are small, dense, and have rocky surfaces (Fact 140) 11. ______ is the fourth planet from the sun, is known as the Red Planet, has a lot of volcanic activity and has two moons (Fact 149) 12. ______ has the densest atmosphere of all the inner planets; its atmosphere is made of carbon dioxide and sulfuric acid (Fact 143) 14. the atomic mass of an elements is the weighted average of all of the _____ of that element (Fact 253) 15. the SI unit of mass is the _____ (Fact 65 16. ______ is when a liquid changes to a gas (Fact 231) 17. the _______ of matter a substance is in is determined by how fast the particles move and how strongly attracted they are to each other (Fact 216) 18. ______, reactivity with an acid, reactivity with a base, and reactivity with oxygen are examples of chemical properties (Fact 211) 20. Group 18 elements are called the ____ ____ or the inert gases (Fact 272) 21. the SI unit for the volume of a solid is the ___ ___ (Fact 54) 24. the _____ or independent variable in an investigation is the factor that is purposely changed; it is what is being tested (Fact 22) 27. there are ______ groups or families of elements on the Periodic Table (Fact 270) 28. There are seven _______ or rows of elements on the Periodic Table (Fact 269) 30. condensation is when a gas changes to a ______ (Fact 236) 31. ______ properties describe the ability of a substance to change into a new substance with different properties; these properties are identified by testing (Fact 210) 32. the SI unit of weight is the ____ (Fact 68) 33. ____ properties of matter can be observed without changing the identity of matter (Fact 204) 34. _______ is able to support life because it has water on its surface and in its atmosphere (Fact 146)

Down 1. the four ____ ____, Jupiter, Saturn, Uranus, and Neptune are called gas giants meaning they do not have solid surfaces (Fact 153) 2. all of the gas giants have ____ made of rock and ice and have many moons (Fact 154) 3. all forces act in _______; one is called the action force and the other is called the reaction force (Fact 127 4. ______ are found to the left of the zigzag line on the Periodic Table (Fact 266) 5. elements on the Periodic Table are arranged by increasing ____ ___ (Fact 264) 8. moving ________(atoms and molecules) make up all matter; these atoms and molecules are attracted to each other (Fact 215) 9. _______ is the rate at which velocity (speed and direction) changes over time (Fact 82) 10. the four inner or ______ planets are Mercury, Venus, Earth and Mars (Fact 139) 13. ________ acceleration occurs when an object moves at constant speed in a circular direction (Fact 85) 19. the _____ or dependent variable in an investigation is the variable that is expected to change because of the manipulated variable; it is what is being measured (Fact 23) 21. a _____ is made of two or more elements that are chemically combined (Fact 274) 22. the ______ variables in an investigation are the factors intentionally kept the same (Fact 21) 23. all nonmetals except for ______ are found to the right of the zigzag line on the Periodic Table (Fact 267) 25. elements in the same group or family have similar ______ or characteristics (Fact 271) 26. _____ ,mass, volume, freezing point, melting point, and boiling point are examples of physical properties of matter (Fact 205) 29. atoms from the same _______ always have the same number of protons (Fact 263)