Chemistry crossword

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Across
  1. 3. change of state from a liquid to a solid.
  2. 4. slow chemical change that occurs when oxygen in the air reacts with a metal
  3. 5. element that has both metallic and non-metallic properties
  4. 7. ratio of the useful energy outpuoman area of higher concentration to one of lower concentration
  5. 10. group 17 elements in the periodic table;the most reactive non-metals
  6. 12. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
  7. 15. organic molecules made up of atoms of carbon, hydrogen, and oxygen (e.g., pasta, rice,potatoes, fruits, bread); can form simple molecules,such as sugar, or large, complex molecules, such asstarch, cellulose, and glycogen p. 199carbon monoxide (CO(g))colourless, odourless gas;produced by incomplete combustion of chemicalscontaining carbon (e.g. hydrocarbons); majorsource: motor vehicles p. 227catalyst substance that helps a chemical reactionto proceed more quickly p. 166cellular respiration chemical reaction that takesplace in cells; food (sugar) reacts with oxygen toproduce energy, water, and carbon dioxide p. 160charge separation concentration of like charges inspecific areas of a neutral object, caused by theapproach of a charged object; for example, anegatively charged object brought close to a wall
  8. 16. ability of a substance to conduct electricity or heat
  9. 20. mass mass of one atom of an elementcalculated from the total number of protons,neutrons, and electrons of that atom; measured inatomic mass units (amu) atomic mass unit measure of atomic mass; 1 amuis equal to 1/12 ththe mass of a carbon 12 atomp atomic number number of protons in the nucleusof one atom of an element
  10. 22. dull, brittle element that does not conduct electricity
  11. 24. invisible negatively charged particle that orbits the nucleus of an atom
Down
  1. 1. process in which molecules move fr
  2. 2. electricity) description of an object that has equal amounts of positive and negative charges
  3. 4. reactions reaction that takes place when two or more substances react to form new substances
  4. 6. compound that dissolves in water to form a solution with a pH higher than 7
  5. 8. mixture in which tiny particles ofone substance are held within another andparticles cannot be separated out from the othersubstance
  6. 9. that has become electrically chargedbecause it has lost or gained electrons; a positiveion is an atom that has lost one or more electrons;a negative ion is an atom that has gained one ormore electrons
  7. 11. compound that dissolves in water to form a solution with a pH lower than 7
  8. 13. to the total energy input in a device or system; usually given as a percent
  9. 14. change of state from a solid to a liquid.
  10. 17. a material that electric charge can move through easily
  11. 18. metals group 1 elements in the periodic table, not including hydrogen; the most reactive of the metals alkaline-earth metals group 2 elements in the periodic table; their reactivity is not as strong as that of the alkali metals
  12. 19. the smallest part of an element that is representative of that element; a neutral particle made up of a nucleus containing protons and neutrons, and in which the number of electrons equals the number of protons
  13. 21. chemical combination of two or more elements in a specific ratio
  14. 23. shiny, malleable, ductile element that conducts electricity
  15. 24. metalsmetals that have a density of 5 orhigher (e.g., copper, zinc, lead, mercury, cadmium,nickel); heavy metals are one type of substancemonitored to determine water quality