Chemistry Study Guide 1. Define viscosity. The resistance of the flowing to liquid. Thicker fluids flow slower than thinner fluids. 2. What are some examples of substances with low viscosity and high viscosity? Low viscosityrubbing alcohol, water , motor oil Higher viscosity- pancake syrup, lava 3. Define physical property. A property that does not change an object or substance into something new 4. Color is an example of which property? Physical Property 5. Flammability is an example of which property? Chemical Property 6. Rusting is an example of which property? Chemical Property 7. Texture is an example of which property? Physical Property 8. An ice cube tray is filled and placed into the freezer. Three hours later when the ice tray is taken out ice cubes have formed. The ability for water to change states of matter is which property? Physical Property 9. You find a rusty nail. The ability for the nail to rust is which property? Chemical Property 10. What physical property of iron would allow you to separate it from a mixture of gravel and sand? Magnetism 11. What is the formula for density? Density = Mass/Volume 12. How do you know if an object will sink or float by looking at the density of that object? If the density of an object is greater than 1, it will sink. If it is less than 1, it will float. 13. How do substances layer? The liquids that are denser will be on the bottom. The liquids that have a low density will be on top. 14. Give an example of a substance as a solid, liquid, and gas. Water-solid-ice liquid-liquid water gas- water-water vapor 15. A solid has a/an___definite___________ shape and a/an ___definite___________ volume. 16. A liquid has a/an ___indefinite_____________shape and a/an_______definite___________ volume. 17. A gas has a/an________indefinite__________ shape and a _________indefinite___________ volume. 18. Define evaporation. Give an example. Liquid to gas Ex. The puddle of water disappears after the sun comes out. 19. Define melting. Give an example. Solid to liquid Ex. Ice cream in a bowl that was left out on the kitchem table. 20. Define sublimation. Give an example Solid to gas Ex. Dry ice used to make fog for a haunted house 21. Define freezing. Give an example Liquid to a solid Ex. Filling an ice cube tray with water and placing it into the freezer to get ice. 22. Define condensation. Give an example gas to a liquid Ex. The mirror in your bathroom is covered in steam after you take a hot shower 23. Define physical change. Give an example A change that does not make a new substance Ex. Mass, color, density, luster, malleability, ductility, flexible, texture, ripping, 24. Define chemical change. Give an example A change that makes a new substance Ex Rusting, burning, reacting 25. Define thermal change. Give an example A thermal change is when a chemical reaction takes places and causes a rise or fall in temperature. Ex. Baking soda and vinegar reacting causes a decrease in temperature of the substances. 26. How do you know a chemical change has occurred? A new substance will form 27. When looking at the Periodic Table, what will tell you the number of protons in an atom of carbon? Atomic number 28. What does the subscript in a chemical formula tell you? The amount of atoms in each element in a chemical formula 29. One indicator for an element to be an element is that it is a pure substance. What are the other two things that indicates an element is an element? It can’t be broken down any further, and it only has one atom 30. Define chemical bond. The combining of elements chemically 31. What does the Law of Conservation of Matter state? Matter is neither created or destroyed 32. Na + Cl-- NaCl What is this an example of? Chemical equation 33. A compound is a pure substance, contains two or more atoms, and ___is chemically combined____________________. 34. How was the first Periodic Table arranged? 35. 36. 37. 38. 39. 40. 41. 42. Be able to determine the atomic number, symbol, atomic mass of an element. What does the location of an element on the Periodic Table tell you? The properties of the element Give an example of an element. Carbon, Oxygen, Hydrogen, Sulfur, Helium, Phosphorus Give an example of a compound. NaCl, KCL, CaCO Give an example of a homogeneous mixture. Homogeneous mixtures look the same throughout. Ex. Kool-aid, apple juice, chocolate milk Give an example of a heterogeneous mixture. The mixture can easily be separated into different parts. You can see the parts. Ex. Salad, pizza, chex mix , peanut butter and jelly sandwich Be able to recognize the number of elements in a formula.HClSONaN has 6 elements How many molecules are in the following formula? 43. What is this picture an example of? A compund 44. Balance the following chemical equations. Be able to balance the equations 45. Define inhibitor. Give an example. A substance that slows down a chemical reaction Ex. Preservatives in food 46. Define catalyst. Give an example. A substance that speeds up a chemical reaction Ex. Enzymes 47. Define endothermic reaction. Give an example. A chemical reaction that absorbs heat Ex. Baking Soda and Vinegar 48. Define exothermic reaction. Give an example. A chemical reaction that releases heat Ex. Zinc and Hydrochloric Acid 49. How does surface area affect the rate (how fast) of a chemical reaction? Smaller surface area the reaction time will decrease. Larger surface area the reaction time will increase.