Silently Begin. Do Now 1) What is a chemical property? 2) Water freezes at 0 C, is this a physical property or a chemical property of water? 3) T/F Checking your weight on a bathroom scale is a qualitative observation. (If false, fix the statement). A characteristic of a pure substance that describes its ability to change into different substances. quantitative Announcements Due: Pages 16-21, Lab Reports Homework: Concept Map Pages 296 301 USA TestPrep due Monday Atoms, Elements, and Compounds L.O. SWBAT describe how atoms, elements, and compounds are related. Calculating Density Mass (m) Amount of matter an object has. SI Units: (International System of Units) grams (g) kilograms (kg) Balance used for measurement Lever balance Triple-beam balance Pan balance Electronic balance Weight (W) Force on the object due to gravity. SI Units: newton (N) Balance used for measurement Spring Balance Weight vs Mass Triple beam balance vs a spring scale DETAILSMASSWEIGHT Definition Effect of Gravity Measurement Balance Used for Measurement A. Quantity of matter in object regardless of volume or acting forces. B. Measurement of the gravitational force acting on object. A. Depends on the gravity at that Place. B. Always constant at any place & any time. A. Newton (N)B. grams (g) A. Triple-beam balance. B. Spring Balance COMPARISON CHART Volume (V) How much space an object takes up. Regular Solid: base width height Units: cm 3 m 3 mL L Volume of Liquids Irregular solids Measure displacement of water 1 mL = 1 cm 3 Meniscus curve of the liquid Density (D) An objects mass divided by its volume. Density = Units: g/cm 3 kg/m 3 g/mL kg/L Mass Volume Predicting Density Review SI Units for... Mass Volume Density 5g, 80kg 10mL, 40L.5 g/mL, 2 kg/L Practice: Mass, Volume, or Density 1) 40 kg 2) 265 g/mL 3) 0.67 g 4) 42 cm 3 5) 71 g/cm 3 Mass Density Mass Volume Density Calculating Density 1.Write down the given information. D = V =m = 2.Plug information into formula. 3.Solve m V D = Summary (5 minutes silent writing) Today I learned about Helper Questions What is the difference between a molecules and a compound? Define matter, mass, and volume. How do you solve for density? Homework Concept Map 1.Choose a simple molecule or compound 2.On a separate sheet of paper make a concept map that relates atoms, elements, and the (molecule or compound). 3.Include the definitions for elements, atoms, and (molecules or compound). 4.Add color and designs, maybe a picture of your molecule or compound. Homework What does this look like? Element Oxygen O Atom Positive Nucleus Negative electron cloud + Atom Positive Nucleus Negative electron cloud Molecule Oxygen Molecule O Element Oxygen O Definitions A molecule is An element is An atom is