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Chemistry – Ch2.1 – Matter and Change

Chemistry – Ch2.1 – Matter and Change Chemistry- the study of the compostition of substances and the changes they undergo Scientific method (OHERAC) O bservation H ypothesis E xperiment R esults A nalysis and C onclusions Theory vs. Law ( vocab ). Matter

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Chemistry – Ch2.1 – Matter and Change

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  1. Chemistry – Ch2.1 – Matter and Change • Chemistry- the study of the compostition of substances and the changes they undergo • Scientific method (OHERAC) • Observation • Hypothesis • Experiment • Results • Analysis and Conclusions • Theory vs. Law (vocab)

  2. Matter Elements- simplest forms of matter (periodic table) ex: iron, aluminum, oxygen Compounds- combinations of elements chemically attached to each other ex: NaCl (table salt), H2O, CH4 (methane) Mixtures Homogeneous mixture- substances mixed together that are the same throughout. ex: air in this room, solutions Heterogeneous mixture- substances mixed, not uniform ex: salad, muddy water, atmosphere

  3. Properties of Matter Physical Properties- deal with the physical state: solid, liquid, gas (table) ex: mass, volume, density, boiling point, melting point, malleability (smash it), ductility (make into wire), etc. These properties don’t change what it is Physical Changes- change any of these ex: boil, freeze, condense, dissolve, break, split, creek, crush, etc.

  4. Chemical Properties – deal with how a substance chemically reacts with other substances. Chemical Change- substances transform into new substances with different properties. Can’t easily be changed back. Evidence of Chemical Reaction: Color change Gas produced Precipitate formed Conservation of Mass (vocab) Ex: AgNO3(aq) + NaCl(aq) NaNO3 (aq) + AgCl(3) reactants products Solid comes out of the solution

  5. Ch 2 HW # 1 1-10 1. When solving a problem using sci method why hypothesis before experiment? Leads you to the correct experiments to attempt 2. Later you will learn that matter is neither created or destroyed. Is this statement a theory or law? 3. Physical state (s, l, g) at room temp: a. gold solid b. gasoline liquid c. helium gas 4. Which are physical changes a. baking a potato b. carving wood c. freezing mercury d. dissolving sugar in water b,c,d

  6. 5. Classify as E, C or M: a. silver b. pine tree c. orange juice d. oxygen e. iced tea f. air 6. A clear liquid in an open container is allowed to evaporate. After 3 days, a solid residue is left. Was original liquid E, C, M? Mixture→Solution (homogeneous) 7. Chemical Name of each: a. Sn tin b. Cu copper c. S sulfur d. Cd cadmium e. P phosphorous f. Cl chlorine 8. List evidence of chemical change: 1. color change 2. gas produced 3. precipitate formed

  7. 9. Classify a physical or chemical change: a. bread is baked chem b. salt dissolved in water phys c. milk spoils chem d. snowflake melts phys 10. When powdered iron is left exposed to the air it rusts. Explain why the rust weighs more than the original powdered iron. Oxygen chemically binds to the iron, making a chemical compound iron oxide

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