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Practice Problems - General Concepts Blank

Practice Problems - General Concepts Blank

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Practice Problems - General Concepts Blank

  1. 1. CHM 111 General Concepts Unit 1 Practice Problems 1. Which of the following are physical and which are chemical changes? Briefly explain your answers. Change Physical Chemical Dew forming on the grass Cooking eggs Brewing coffee (Hint: Could you separate the water from the molecules extracted from the coffee?) Separating isopropyl alcohol and water Photosynthesis by plants 2. a) Define the terms below. Pure substance- Element- Compound- Mixture- b) Analyze the samples given below. The two different types of atoms are identified by the following symbols: o and . Identify the substances in the boxes according to the following criteria: P = pure substance E = element C = compound M = mix Element or Compound? ______ _____________ ______ Pure substance or Mixture? ______ _____________ ______ 10 nm10 nm 20 nm
  2. 2. CHM 111 General Concepts Unit 1 Practice Problems 3. a) Identify the substances in the boxes as heterogeneous or homogenous. b) Provide an example of a homogeneous mixture from your everyday experience. c) Provide an example of a heterogeneous mixture from your everyday experience. 4. a) Define the two terms listed below and provide an example from your everyday experience: Intensive property- Extensive property- b) Identify the following as intensive (I) or extensive (E) properties: ________ temperature ________ boiling point ________ volume ________ color ________ odor ________ mass ________ density ________ electrical conductivity 5. Three ways to separate mixtures are described in the textbook; filtration, distillation, and chromatography. Briefly describe each of these techniques. Filtration- 10 nm10 nm 20 nm
  3. 3. CHM 111 General Concepts Unit 1 Practice Problems Distillation- Chromatography- 6. You have a mixture of sand and salt. Design a simple separation, explaining your procedure step by step and include a labeled drawing for each step. You may use whatever materials you need to do the separation. Is the separation a physical or chemical process? Step 1. Obtain the salt and sand mixture. Step 2. Step 3: Step 4: Step ____. 7. A solution of methyl t-butyl ether has a volume of 65.0 mL and a mass of 48.23 grams. Determine the density for this solution. 8. Suppose a student has three balls of equal mass. Determine which of the balls is the largest. Show any appropriate equations and/or calculations and justify your answer with a brief sentence. Densities: a = 3.24 g/mL b = 1.56 g/mL c = 0.650 g/mL

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