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Across 1. A type mixture where different materials are visible throughout. 6. A question that involves a measurement is said to be ? 7. Type of properties that can be observed without changing the identity of a substance. 9. Term meaning how matter is put together. 11. Visible to the naked eye. 13. The effect of gravity on an object's mass. 14. Term meaning what a substance is made up of. 17. Type of properties that depend on the amount of matter present. 18. Properties that DO NOT depend on the amount of matter present. 19. A mixture of two or more metals. 20. Two or more substance combined but not joined chemically.

Down 2. Too small to be seen even with a microscope. 3. A collection of chemical symbols and numbers that represent a compound. 4. The amount of matter in an object. 5. Scientists create these to help them understand objects or ideas that cannot be seen. 6. A question that does NOT involve measurement is said to be? 8. A mixture where one substance completely dissolves in another. 10. A type mixture that appears the same throughout. 12. Properties that can only be observed during a reaction. 14. Science that studies the composition, structure and changed of matter. 15. Anything having mass and volume. 16. Models are based on ____ evidence.