Test Review

1. Test Review 3.1 Classification / Separation of Matter 3.2 States and Properties of Matter

2. ANSWER KEY

3. 1. A mixture of sand and salt are most easily separated due to differences in their ___. A) densities B) boiling points C) solubility D) magnetic properties E) mass

4. 2. Which of the following methods would be best for separating a mixture of water and alcohol? A) magnetism B) distillation C) filtration D) chromatography E) boiling

5. 3. Chromatography will separate two liquids due to differences in their ___. A) magnetic properties B) State (phase) of matter C) boiling and vaporization temperatures D) charge and/or mass E) melting and freezing points

6. 4. Which of the following is an example of ahomogeneous mixture? A) sand mixed with oil B) salt dissolved in water C) table sugar D) gasoline mixed with water E) ball bearings in a box

7. 5. Compounds can be broken down into their elements by ___. A) physical processes B) melting C) evaporation D) cooling E) chemical processes

8. 6. A pure substance is matter with a composition that ___. A) is fixed in a definite proportion at all times • consists of all the same type of atom C) is transparent • contains the element carbon • always contains two or more substances

9. 7. When sample X is passed through a filter paper, a white residue, Y, remains on the paper and a clear liquid, Z, passes through. When liquid Z is vaporized, another white residue remains. Sample X is best classified as ___. A) a homogeneous mixture B) a compound C) a heterogeneous mixture D) an element E) a pure substance

10. 8. Which state of matter has no fixed volume or shape? • solution • solid • liquid • gas • mixture

11. 9. Which represents a homogeneous mixture? A) Pure water B) Oil and water C) Salt water D) fog E) mayonnaise

12. 10. Which of the following is a chemical change? • ice melting to liquid water • wood burning in a fireplace • chopping wood for a fire • sewing a button on a shirt • Evaporating salt water to recover the salt

13. 11. A compound differs from a mixture in that a compound always has a ___. • homogeneous composition • heterogeneous composition • maximum of two components • variable composition • minimum of three components

14. 12. Which would be considered a chemicalchange? A) bending of iron B) magnitization of iron C) rusting of iron • melting of iron

15. 13. Element A and Element B become chemically bonded together to form substance C. Substance C must be a(n) ___. A) solution B) element C) compound D) mixture

16. 14. Which of the following is a chemical property of matter? ability to heat up ability to change phase ability to turn into a gas ability to dissolve ability to burn

17. 15. Which of the following statements describes a chemical property of the element iodine? • It crystals are a metallic gray. • It reacts with hydrogen to form a gas. • It vaporizes into a violet-colored gas. • It dissolves in alcohol. • It has a pungent smell.

18. 16. Which of the following is an example of a physical change? • wood burning in a fireplace. • water freezing • iron rusting • digesting food • milk souring

19. 17. When you observe the formation of fog on a cool, humid day, what type of event are you observing? • a chemical change in oxygen • a physical change in air • a physical change in water • a chemical change in water • a combination of nitrogen and oxygen

20. 18. Which of the following is a heterogeneous mixture? • the liquid metal, mercury, Hg • the alloy, bronze • any colloid • any compound • any solution

21. 19. Which of the following is a solution? A) air B) jello C) glucose, C6H12O6 D) mayonnaise E) milk

22. 20. Identify the physical change in the following list. • A candle is burned to give light. • A silver candlestick tarnishes in the air. • The chemical silver nitrate produces a dark brown stain on skin. • A piece of copper placed in a solution of silver nitrate develops a coating of silver metal. • Silver is melted to form a candlestick.

23. 21. When saccharine dissolves in water, this event is an example of ___. A) a physical change B) a chemical change C) a chemical property D) melting E) the formation of a compound

24. 22. Which of the following is an example of anintensive physical property? • the ability to burn • mass • size • density • weight

25. 23. What separation procedure uses the laboratory apparatus shown below? • Distillation • Chromatography • Evaporation • Vaporization • Filtration

26. 24. In an equation, which symbol would indicate a mixture? 

27. 25. Mixtures are defined as ___. • combinations of elements, only • always homogeneous • combinations of compounds and/or elements • always in definite proportions • always heterogeneous

28. 26. Which substance can not be decomposed by chemical change? A) sulfuric acid, H2SO4 B) argon, Ar C) water, H20 D) ammonia, NH3 E) the diatomic element, O2

29. 27. What process is used to separate the components of a mixture based on differences in charge and/or mass? A) chromatography B) filtration C) distillation D) evaporation E) vaporization

30. 28. A true solution is best described as a___. • heterogeneous mixture • homogeneous mixture • heterogeneous compound • homogeneous compound • liquid

31. 29. A chemical property of copper at 25oC (room temperature) is it ___. • has a density of 8.9 g/mL • reacts with acids but not water • is a solid • will conduct electricity • is not soluble in water

32. 30. The elements of a water can be separated by ___. • physical means • fission or fusion • chemical means • distillation • evaporation

33. 31. The particle diagrams below represent a substance in the solid phase? A B C D none of these

34. 32. Which of the following is due to an extensive property of copper? • it melts at 1083oC • it weighs less on the moon than on the Earth • it has a density of ≈ 8.9 g/cm3 • it conducts electricity • it is reddish-brown in color