Smoke, milk, shaving cream, and fog are all examples of:homogeneous mixturescolloidscompoundsQUESTION 2 heterogeneous mixtures Copper is an example of a(n): homogeneous mixture heterogeneous mixture compound element QUESTION 3 You collect several samples of a material from various locations. If each sample is comprised of the same two or more substances in the same proportion, the material you are examining is a(n): homogeneous mixture heterogeneous mixture element compound QUESTION 4 An unopened
Smoke, milk, shaving cream, and fog are all examples of:homogeneous mixturescolloidscompoundsQUESTION 2 heterogeneous mixtures Copper is an example of a(n): homogeneous mixture heterogeneous mixture compound element QUESTION 3 You collect several samples of a material from various locations. If each sample is comprised of the same two or more substances in the same proportion, the material you are examining is a(n): homogeneous mixture heterogeneous mixture element compound QUESTION 4 An unopened bottle of soda pop is a homogeneous mixture. True False QUESTION 5 All elements are pure substances. True False
QUESTION 6 If two well-trained chemists, in separate locations, are both producing 'Compound X,' then the two samples of 'Compound X' are identical. True False
QUESTION 7 One day, after much exercise, my friends and I were thirsty. Upon searching through the refrigerator, we found a variety of liquids to drink:water,orange juicewith extra pulp,milkwith extra calcium added andiced tea. Use the following terms to label each of the italicized items listed above: element, compound, solution, colloid and suspension.
QUESTION 8 Pure substances and mixtures are different because mixtures: always have exactly the same composition have exact melting points retain the properties of the constituents in the mixture cannot be separated into their components by physical means
QUESTION 9 Pure substances and solutions are alike because they: are both homogeneous can both be homogeneous or heterogeneous are both heterogeneous are both types of mixtures
QUESTION 10 The components of a heterogeneous mixture are not uniformly distributed. True False
QUESTION 11 Elements, unlike compounds, are pure substances. True False
QUESTION 12 Water is not a pure substance. True False
QUESTION 13 Which of the following is a physical change of matter? roasting marshmallows mixing Kool-Aid and water mixing Alka Seltzer and water baking a cake
QUESTION 14 Which of the following is not an example of a physical change of matter? sawing wood tearing paper stretching a rubber band burning paper into ash
QUESTION 15 All physical changes are reversible. True False
QUESTION 16 Since you cannot replace the peel on a peeled orange, peeling an orange is an example of a chemical change. True False
QUESTION 17 Ironing a cotton shirt is an example of a physical change. True False
QUESTION 18 Heterogeneous mixtures have: chemical properties that are constant throughout the whole sample chemical properties that do not depend on how they were prepared fixed and constant composition chemical properties of the pure substances that make them up
QUESTION 19 Compounds are chemically different from mixtures because: mixtures always have identical chemical properties if the same substances are used when making the mixtures mixtures are always homogeneous compounds always involve energy changes when they are formed compounds may be homogeneous or heterogeneous
QUESTION 20 Which one of the following is an example of a chemical change? breaking a stick milk spoiling snow melting chopping wood
QUESTION 21 Soaking beans in water make the beans swell in size. If left to dry, the beans return to their original size and shape. Therefore, this is a physical change. True False
QUESTION 22 Suppose that when you wake up in the morning, you are very hungry. So,you brew some coffee, cook some oatmeal on the stove, make some toasted bread, melt some butter on the toast,and thenplace an antacid tablet in water.Which of the italicized items are physical changes and which are chemical changes? QUESTION 23 Which of the following is a chemical property of iron? it is malleable it can be drawn into a wire it reacts with oxygen to form rust it has a melting point of 1811K
QUESTION 24 A property that can be observed without changing the identity of a substance is a: chemical property physical property exothermic property endothermic property
QUESTION 25 Matter that has definite shape and definite volume is a: solid liquid gas plasma
QUESTION 26 This form of matter does not have definite shape or volume. solids liquids gases colloids
QUESTION 27 Which of the following is a physical property? magnetism flammability reactivity toxicity
QUESTION 28 The amount of matter in an object is referred to as: mass volume gravity weight
QUESTION 29 Ice cream melting is a chemical change. True False
QUESTION 30 When iron rusts, it is the result of a physical change. True False
QUESTION 31 To separate liquids in a mixture of different liquids, each having different boiling points, one would use the separation technique of: filtration evaporation distillation chromatography
QUESTION 32 A chef wants to separate animal fats from broth. The separation technique that would best accomplish this is: evaporation decantation distillation absorption
QUESTION 33 You have a mixture of iron and lead filings. Magnetism would be a good way to separate these. True False
QUESTION 34 Describe how you would separate a mixture of iron flakes, salt, sawdust and sand.
QUESTION 35 You just used the last of your breakfast cereal to make yourself a fresh bowl. After eating a couple of spoonfuls, you notice that the printing on the box claims that your cereal has the most metallic iron of any breakfast cereal on the planet. Now, your only sample of the breakfast cereal contains bran flakes, raisins, milk, and sugar. You decide to find out if the claim regarding the iron is true. How would you separate the mixture to collect the iron?
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