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