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Across
  1. 2. An amorphous (non-crystalline) form of matter between a gas and a solid that has a definite volume, but no definite shape.
  2. 5. A substance consisting of atoms which all have the same number of protons - i.e. the same atomic number.
  3. 6. A substance formed when two or more chemical elements are chemically bonded together.
  4. 9. These include carbon monoxide, carbon dioxide, carbonates, cyanides, cyanates, carbides, and thiocyanates.
  5. 11. Properties, such as density and color, do not depend on the amount of matter.
  6. 13. A measure of the amount of matter in an object.
  7. 14. An airlike fluid substance which expands freely to fill any space available, irrespective of its quantity.
  8. 18. The branch of chemistry concerned with the application of the techniques and theories of physics to the study of chemical systems.
  9. 22. Anything that has mass and takes up space.
  10. 23. The branch of science concerned with the processes and phenomena of the atmosphere, especially as a means of forecasting the weather.
  11. 25. Elements that form cations when compounds of it are in solution and oxides of the elements form hydroxides rather than acids in water.
  12. 26. Dealing with radioactivity.
  13. 27. The branch of science that deals with the identification of the substances of which matter is composed.
  14. 29. A substance that is produced or used in a process (reaction) involving changes to atoms or molecules.
Down
  1. 1. An ionized gas consisting of positive ions and free electrons in proportions resulting in more or less no overall electric charge, typically at low pressures
  2. 3. The basic unit of a chemical element.
  3. 4. The scientific study of the behavior, structure, physiology, classification, and distribution of animals.
  4. 5. Property that changes when the size of the sample changes. Examples are mass, volume, length.
  5. 7. A physically distinctive form of matter.
  6. 8. Any substance that has a uniform and unchanging composition is considered to be pure.
  7. 10. Relating to living organisms.
  8. 12. Studies the composition, structure, properties and change of matter.
  9. 15. A distinctive smell, especially an unpleasant one.
  10. 16. Used to express liters, cubic meters, gallons, milliliters, teaspoons and ounces.
  11. 17. A metabolic process in plants and certain bacteria, using light energy absorbed by chlorophyll.
  12. 19. A measure of the intensity of heat, i.e. the hotness or coldness of a sample. or object.
  13. 20. In chemistry, a heavy, silvery metallic element, a liquid at normal temperatures and it's toxic.
  14. 21. The scientific study of plants
  15. 24. Subdiscipline involving the scientific study of the structure, properties, and reactions of compounds
  16. 28. Packed together much closer than the particles in a gas or liquid.