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Across 3. A change of matter from one form to another without a change in chemical properties. 4. A measure of the size of a body or region in three-dimensional space. 6. An explanation of some phenomenon that is based on observations, experimentation, and reasoning. 11. A combination of chemical symbols and numbers to represent a substance. 14. A summary of many experimental results and observations; tells how things work. 17. A sample of matter, either a single element or a single compound, that has definite chemical and physical properties. 19. A property of matter that describes a substance’s ability to participate in chemical reactions. 21. The ability and willingness to assess claims critically and to make judgments on the basis of objective and supported reasons. 22. A measure of the straight-line distance between two points. 25. Describes two or more liquids that can dissolve into each other in various proportions. 29. The ability of a substance to react in the presence of oxygen and burn when exposed to a flame. 32. Describes something that has a uniform structure or composition throughout. 33. A substance that cannot be separated or broken down into simpler substances by chemical means; all atoms of an element have the same atomic number. 34. To reduce the number of zeros, you can express values as a simple number multiplied by a power of 10. 35. The application of science for practical purposes.

Down 1. A characteristic of a substance that does not involve a chemical change, such as density, color, or hardness. 2. Composed of dissimilar components. 5. Anything that has mass and takes up space. 7. The capacity of a substance to combine chemically with another substance 8. The temperature and pressure at which a solid becomes a liquid. 9. The smallest unit of a substance that keeps all of the physical and chemical properties of that substance. 10. A change that occurs when a substance changes composition by forming one or more new substances. 12. A measure of the amount of matter in an object. 13. ___is observing, studying, and experimenting to find the nature of things. 15. A measure of the gravitational force exerted on an object. 16. A series of steps followed to solve problems, including collecting data, formulating a hypothesis, testing the hypothesis, and stating conclusions. 18. A prescribed decimal place that determines the amount of rounding off to be done based on the precision of the measurement. 20. A combination of two or more substances that are not chemically combined. 23. The exactness of a measurement. 24. A factor that changes in an experiment in order to test a hypothesis. 26. The temperature at which a liquid becomes a gas. 27. A substance made up of atoms of two or more different elements joined by chemical bonds. 28. The ratio of the mass of a substance to the volume of the substance. 30. The smallest unit of an element that maintains the properties of that element. 31. A description of how close a measurement is to the true value of the quantity measured.