Across
- 2. this small number following an element’s symbol in a chemical equation tells you how many atoms of that element are present in the reaction
- 4. if a solution is _________ then it is able to dissolve more solute at a given temp
- 8. a mixture where particles can be seen and separated by settling or filtration.
- 9. salt and water are considered ___ ___ because they have fixed chemical compositions
- 12. a solid may form when 2 liquids react, it is called this, a ___
- 14. if chemicals change ___, it may indicate a chemical reaction has taken place
- 17. what does the dissolving In a solution
- 19. the measure of how much solute can dissolve in a solvent at a given temperature
- 21. material made by humans and are not natural are called __________
- 25. a mixture that you can see the separate parts
- 27. in this type of reaction system, the reaction is contained, matter cannot enter or exit
- 28. adding water or another solvent to a solution will ____ the mixture and could slow down the reaction
- 29. long chains of molecules made of repeating units called monomers - examples are plastics and wool
- 30. Material made up of 2 or more substances that can be separated by physical means
- 32. the Law of ___ __ ___ states matter cannot be created nor destroyed, only changed
- 35. these/this is any compound that is reacting, it is on the left side of the arrow in a chemical equation
- 37. all the atoms of each element reacting in a chemical equation must ___ the number of atoms that are being produced.
- 38. this number in front of a compound in a chemical equation tells you how many molecules of that compound there are
- 41. the things that are produced in a chemical reaction
- 42. these are examples of synthetic foods- they are added too food to make them last longer
- 43. a compound that speeds up a chemical reaction without itself being consumed
- 46. type of reaction that gives off energy
Down
- 1. if this (tiny bubbles) are produced during a reaction, it may indicate a chemical reaction
- 3. this type of reaction takes simple things and combines them to make them more complex
- 5. in this type of reaction, positive ions of both compound switch places
- 6. in this type of reaction, one substance changes places with another
- 7. a compound that prevents or slows down a chemical reaction
- 10. ___ energy is the minimum amount of energy needed for a reaction to take place
- 11. the scattering of light as it passes through a colloid is called the ___ __
- 13. a mixture that is the same throughout
- 15. in this type of reaction, one complex compound will break down into simpler ones
- 16. when determining if something will dissolve something else it is helpful to remember the phrase “___ ____ ____”
- 18. what gets dissolved in a solution
- 20. a ___ change is one in which the appearance of the matter changes, it does not change what it is
- 22. if a solution is _______ then it contains more solute than a saturated one. Solution is unstable and may form crystals
- 23. in this type of chemical reaction system, the environment can influence the reaction, or matter can enter and escape from the reaction
- 24. if a solution is __________ then contains all the solute it can at a given temp
- 26. type of reaction that absorbs energy as it happens
- 28. separating a mixture by heating so that the part that has a lower boiling point will evaporate first, then it is collected while the gas cools and condenses
- 31. a chemical reaction occurs when existing chemical ___ are broken and new ones may be made
- 33. crushing or breaking something up will increase the __ __ of the substance and allow more surfaces for the reaction to take place
- 34. a ___ change occurs when a new substance is created
- 36. a chemical ___ shows the number of chemicals and how they react to form now substances
- 38. a mixture containing small undissolved particles that do not settle out- they may be too small to see, but they can scatter light.
- 39. these are catalysts in our body that speed up chemical reactions
- 40. the amount of __ in a given volume is concentration
- 42. you can put chemical inhibitors called ___ onto food to keep them from decaying
- 44. increasing this will cause particles to move faster and will increase the reaction rate, lowering it will decrease the rate
- 45. the arrow in a chemical equation means this word