Introductory Chemistry For Today
8th Edition
ISBN: 9781285644561
Author: Seager
Publisher: Cengage
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Classify the following as to chemical or physical change:
Assignment : Copy and write your answer beside the given words
1. formation of fog2. acetone evaporates3. mixing alcohol in water 4. cutting of styrofoam5. pulverising Biogesic tablet 6. dyeing white hair 7. Freezing of liquid 8. Combustion of paper9. souring of food 10. production of light from electricity 11. digesting of chicken12. corrosion of metal13. chewing a food14. stretching of balloon
Classify the following as physical or chemical changes. a.Moth balls gradually vaporize in a closet. b.Hydrofluoric acid attacks glass and is used to etch calibra-
tion marks on glass laboratory utensils. c. A French chef making a sauce with brandy is able to boil
off the alcohol from the brandy, leaving just the brandy
flavoring. d. Chemistry majors sometimes get holes in the cotton jeans
they wear to lab because of acid spills
Classify each process as a chemical or physical change. a. the condensation of water on the outside of a cold glass b. mixing a teaspoon of instant coffee with hot water c. baking a cake
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- 1.13 Physical properties may change because of a chemical change. For example, the color of an egg white changes from clear to white because of a chemical change when it is cooked. What is another common situation in which a chemical change also leads to a physical change?arrow_forwardClassify the following changes as chemical C or physical P a Baking bread b Grinding sugar into powder c What type of change is represented in c.? d What type of change is represented in d.?arrow_forwardMatter in the __________ state has no shape and fills completely whatever container holds it.arrow_forward
- The following photo shows the element potassium reacting with water to from the element hydrogen, a gas, and a solution of the compound potassium hydroxide. (a) What states of matter are involved in the reaction? (b) Is the observed change chemical or physical? (c) What are the reactants in this reaction, and what are the produces? (d) What qualitative observations can be made concerning this reaction?arrow_forwardCompare and contrast the ease with which molecules are able to move relative to each other in the three states of matter.arrow_forwardThe photo below shows elemental iodine dissolving in ethanol to give a solution. Is this a physical or chemical change?arrow_forward
- A hot metal block is plunged into water in a well-insulated container. The temperature of the metal block goes down, and the temperature of the water goes up until their temperatures are the same. A total of 1500 J of energy' is lost by the metal object. By how much did the energy of the water increase? What law of science is illustrated by this problem?arrow_forwardHow does a homogeneous mixture differ from a pure substance? How are they similar?arrow_forwardClassify each of the following as a physical or chemical change, and give at least one observation, fact, or reason to support your answer. a. A plum ripens. b. Water boils. c. A glass window breaks. d. Food is digested.arrow_forward
- During a very cold winter, the temperature may remain below freezing for extended periods. However, fallen snow can still disappear, even though it cannot melt. This is possible because a solid can vaporize directly, without passing through the liquid state. Is this process (sublimation) a physical or a chemical change?arrow_forwardHow does an element differ from a compound? How are they similar?arrow_forwardWhich of the following are considered compounds (as opposed to elements)? He F2 HCI S8arrow_forward
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