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Across 5. a measure of the gravitational force exerted on an object 7. the physical forms of matter, which are solid, liquid, gas, and plasma 11. either a single element or a single compound, that has definite chemical and physical properties 14. a substance or molecule that participates in a chemical reaction 15. the process by which one or more substances change to produce oneor more different substances 16. can consist of one atom or two or more atoms bonded together 18. a substance that cannot be separated or broken down into simpler substances by chemical means 20. a characteristic of a substance that does not involve a chemical change 21. the ratio of the mass of a substance to the volume of the substance

Down 1. a quantity adopted as a standard of measurement 2. something that has magnitude, size, or amount 3. a property of matter that describes a substance's ability to participate in chemical reactions 4. a ratio that is derived from the equality of two different units 6. composed of dissimilar components 8. a measure of the amount of matter in an object 9. the smallest unit of an element htat maintains the properties of that element 10. describes something that has a uniform structure or compostition throughout 12. anything that has mass and takes up space 13. a measure of the size of a body or region in three-dimensional space 15. any substance that has a defined composition 17. a substance made up of atoms of two or more different elements joined by chemical bonds 19. a combination of two or more substances that are not chemically combined 20. a substance that forms in a chemical reaction