Chapter 1 & 2 Academic Chemistry Review

  1. Identify each example as an element (E), compound (C), homogeneous mixture (Homo), or Heterogeneous mixture (Hetero).
  2. Salt waterHomo
  3. Pure water (H2O)C
  4. Sodium chloride (NaCl)C
  5. Chicken noodle soupHetero
  6. Calcium (Ca)E
  7. Italian salad dressingHetero
  8. Silicon (Si)E
  9. AirHomo
  10. Muddy water with particles sinking to the bottomHetero
  11. Carbon Dioxide (CO2)C
  1. Identify each example as a Chemical Property (CP) or Physical Property (PP).
  1. ExplosiveCP
  2. ToxicCP
  3. ShapePP
  4. Boiling PointPP
  5. FlammableCP
  6. ColorPP
  7. Acidic CP
  8. SizePP
  9. CorrosiveCP
  1. Identify each example as a Chemical Change (CC) or Physical Change (PC).
  1. Melting icePC
  2. Dissolving Kool Aid in water (no change in temperature)PC
  3. Digestion of foodCC
  4. Folding PaperPC
  5. Burning a matchCC
  6. Dissolving aluminum chloride in water (it gets colder)CC
  7. Evaporating acetonePC
  8. Baking sodaneutralizing hydrochloric acidCC
  9. A nail rusting (oxidizing)CC
  10. Boiling waterPC
  1. What are the 6 areas of study in chemistry?

1. Analytical

2. Physical

3. Biochemistry

4. Organic

5. Inorganic

6. Theoretical

  1. What are the 6 steps to the scientific method?

1. Define problem

2. Do research/make observations

3. Form hypothesis

4. Do experiment

5. Analyze results

6. Write conclusion

  1. What is the difference between a hypothesis and a theory? A theory and a law?

Hypothesis is proven and disproven all the time, theory but is not always accepted by all

Lawhas always been proven to be true and it is accepted by all

  1. To which classification of matter is a solution most closely related?

Homogeneous mixture

  1. What are the 4 physical separation techniques? Give an example of what you might separate with each technique.

TechniqueExample

1. DistillationSeparate 2 liquids by boiling points

2. FiltrationSeparate heterogeneous mixtures by particle size

3. ChromatographySeparate Heterogeneous mixtures by size and polarity

4. EvaporationSeparate homogeneous mixtures (solutions) by removing liquid

  1. What are the 4 signs that indicate a chemical change has occurred?
  1. Color change
  2. Temperature change
  3. Formation of a gas
  4. Formation of a precipitate
  1. A chemical change always results in the formation of a ____NEW______Substance______.
  1. Define element

Smallest unit of matter

  1. Define compound

Two or more different elements bonded together

  1. Define homogeneous mixture

Evenly mixed, can’t see the parts

  1. Define heterogeneous mixture

Not evenly mixed, parts can be seen

  1. List some examples of physical and chemical properties

PhysicalChemical

Colorflammable

Sizetoxic

Shapeacidic

Melting pointcorrosive

Boiling pointoxidizer

  1. List some examples of physical and chemical changes

PhysicalChemical

Change in state (melting, etc…)burning

change in shapecooking

Evaporatingrusting

  1. How could you separate a mixture of white salt and sand? You must end up with 2 solids. Use complete sentences.

Pre-write this and study!!!! (you can’t bring it to the test)

  1. A burning candle exhibits both physical and chemical changes. Provide a list of at least 3 chemical changes and at least 2 physical changes. Use complete sentences and be sure to specify which changes are chemical and which are physical.

Pre-write this and study!!!! (you can’t bring it to the test)