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Across 1. A few elements with intermediate properties 4. an English Chemist, was the first to determine the quantitative relationship between the volume and pressure of gases 8. the number of constituent particles 11. used toused to channel liquid or fine-grained substances into containers with a small opening 16. substance microscopically dispersed evenly throughout another substance 17. depicts the atom as a small, positively charged nucleus surrounded by electrons 18. quantity of substance 19. method for separating mixtures 23. the outward movement of molecules from their source 25. are chemical combinations of two or more different elements 28. component present in small amount 29. a mixture composed of two or more elements 31. positive electric charge 33. perpendicular force exerted on a unit area 36. particles of the cathode ray 39. compound of one kind of substance 40. occupies space 41. It is characterized by structural rigidity and resistance to changes of shape or volume 42. it is defined as the amount of matter in an object

Down 2. cofactor for a number of enzymes 3. known commercially as muriatic acid 5. are biological molecules essential for all known forms of life 6. a substance exists as a solid 7. involves the sharing of pairs of electrons between atoms 9. a mass slightly larger than that of a proton 10. made by comparing a quantity with a standard unit 12. the rate of effusion of a gas is inversely proportional to the square root of the mass of its particles 13. process for the separation of mixtures 14. mixture of two chemicals with the property that on does not rapidly settle out 15. it is the study of composition, properties and behavior of matter 20. a substance which reacts with a base 21. mixture whose components have different densities 22. its charge is postive 24. variants of a particular chemical element 26. a material with a definite chemical composition 27. it is the space occupied by an object 30. component present in larger amount 32. it is also defined as its weight per unit volume 34. are large biological molecules responsible for the thousands of chemical interconversions 35. tiny, indivisible particles 37. a good conductor of both electricity and heat 38. the functional basic unit of life