Across
- 4. object or material that allows the flow of an electric current in one or more directions.
- 5. greek word that means uncut
- 7. it is the lightest element in the periodic table.
- 10. a negatively charged ion
- 11. it is a variant of a particular chemical element which differs in the number of neutrons present in the nucleus.
- 16. he is a greek philosopher who believed all elements are made of fire, water, earth and air.
- 17. anything that occupies space.
- 20. soft gray metal,with an atomic number of 20.
- 22. it is a chemical substance that dissolves metals, typically a corrosive or sour-tasting liquid.
- 23. change that takes place without any changes in molecular composition.
- 28. a stable subatomic particle, with a positive electrical charge equal in magnitude to that of an electron
- 29. the medieval version of chemistry
- 31. the product of the random distribution of one substance through another without any chemical reaction, as distinct from a compound.
- 33. it is a special type of homogeneous mixture composed of two or more substances.
- 34. it uses heat to separate substances.
- 36. a stable subatomic particle with a charge of negative electricity, primary carrier of electricity.
- 38. it is a measure of the space occupied by an object.
- 40. measure of mass per volume.
- 42. these elements are odorless, colorless, monatomic gases with very low chemical reactivity.
- 44. any object or material that allows the flow of an electric current in one or more directions.
- 45. it is a mixture where particles are distributed non-uniformly.
- 47. ability to dissolve.
- 48. it is distinguished by its atomic number.
- 49. it is an outer shell electron that is associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed.
Down
- 1. how many states of matter are there?
- 2. a positively charged ion
- 3. it is a property of physical matter that is a measure of its resistance to acceleration when a net force is applied.
- 6. most abundant element in the earth's crust
- 8. digits that carry meaningful contributions to its measurement resolution
- 9. a substance that dissolves solute.
- 12. a separation method that uses a porous or perforated device or material in order to separate out any solid matter.
- 13. a subatomic particle of about the same mass as a proton but without an electric charge.
- 14. As solid matter is heated it eventually melts or changes into a liquid state.
- 15. he introduced the atomic theory.
- 18. a mixture of metals or a metal and another substance.
- 19. it is a substance formed from two or more elements chemically united in fixed proportions.
- 21. a unit (symbol: mol) that measures the amount of a substance in terms of the absolute number of particles or entities composing the substance.
- 24. it is a precious metal, it is also edible, its atomic symbol is Au.
- 25. change that takes place with changes in molecular composition.
- 26. any chemical element which is a good conductor of both electricity and heat and which readily forms cations and ionic bonds with non-metals.
- 27. he created the plum pudding model.
- 30. a compound made of sodium and chlorine.
- 32. it is a mixture where particles are distributed uniformly.
- 35. basic unit of a chemical element.
- 37. the change of one or more substances into one or more different substances.
- 39. the creator of the periodic table.
- 41. the branch of science that deals with the identification of the substances of which matter is composed
- 43. the action or process of filtering something.
- 46. any persistent attraction between atoms, ions, or molecules that enables the formation of chemical compounds.