Water Displacement displacement occurs when an object is immersed in a fluid, pushing it out of the way and taking its place. The volume of the fluid displaced can then be measured, as in the illustration, and from this the volume of the immersed object can be deduced
http: //www. execulink. com/~ekim mel/density_displacment. htm This animation shows how a rubber stopper placed in a graduated cylinder will cause the water level to rise. Since the volume of the stopper is equal to the volume of water displaced and the initial and final mass is known, the density of the irregularly shaped stopper can be determined.
Density- is a property that can be used to identify a substance. Calculating Density: Density = Mass Volume
Density ******If the density is greater than 1 the object will sink *****If the density is less than 1 the object will float q Wood has a density of 0. 85 g/cm – it will float Steel has a density of 7. 81 g/cm- it will sink
*** Density- never changes Weight and volume do change
Matter Anything that has mass takes up space
Mass vs Weight Mass How much matter Weight How much mass the effects of gravity
Calculating weight Weight = m * g Label in Newton (N) Three steps: Ø Formula Ø Plug in numbers Solve and label your answer
Phase changes During a phase change particles are changing o Speed Distance between each particle
3 points where temperature changes – A, C, E 2 points where temperature doesn’t change- B, D D B A C E
WHY ? ? l. Particles are going through a phase change l. Chang speed and how far they are apart
Physical properties Depends on the matter itself Density, Mass, Weight, Volume, Color , Order, Texture http: //www. saskschools. ca/curr_content/ science 9/chemistry/lesson 8 b. html
Chemical properties Depends on the reaction of the matter with other matter Flammable Corrosive http: //www. sasksc hools. ca/curr_cont ent/science 9/chem istry/lesson 8 a. html
Heterogeneous mixture that does not appear to be the same throughout. EX: Chocolate Chip cookies, Pizza
Homogeneous Mixture A mixture that appears to be the same throughout. It is “well mixed. ” EX: Milk, toothpaste, and mayonnaise
Alloys- are metal solutions
Compound Molecule More than 1 kind of atom Can be the same OR different kinds Chemically combined Element Chemically combined Ex: H 20, Water, EX: Hydrogen table salt gas One kind of atom EX: uranium, calcium
Classify each of the following substances as; an element, a compound, a solution, or a heterogeneous mixture. 1. Sand 2. Salt 3. Pure Water 4. Soil 5. Soda 6. Pure Air 7. Carbon Dioxide 8. Gold 9. Bronze 10. Oxygen 11. Salad Dressing 12. Salt Water
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