Chemistry for Today
8th Edition
ISBN: 9781133606994
Author: Seager, Spencer L./
Publisher: Cengage Learning
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42. Classify each change as physical or chemical.(a) Sugar dissolves in hot water.(b) Sugar burns in a pot.(c) A metal surface becomes dull because of continued abrasion.(d) A metal surface becomes dull on exposure to air.
A calorie is a form of
a light
b darkness
c heat
d sound
Observed increases in global temperatures are caused byelevated levels of carbon dioxide. Is this statement a theory or a scientific law? Explain your reasoning.
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- The boiling of water is a physical change because the water disappears. physical change because the gaseous water is chemically the same as the liquid. chemical change because heat is needed for the process to occur. chemical change because hydrogen and oxygen gases are formed from water. chemical and physical change. Explain your answer.arrow_forward1.13 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_forward
- 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 spillsarrow_forwardConvert following into scientific notation: 850arrow_forwardWhich of the lower ones is not correctly recognized for a physical property? A) The ability of a loop to change B) The change in the composition of the Ormegin is a feature that can be observed in the first instance. C) Substances consisting of only one type of atoms are also observed. D) Omejin is the characteristic that can only be observed as a chemical change. E) It is a property that can be observed without changing its omega composition.arrow_forward
- 1.21 Label each of the following as either a physical process or achemical process: (a) rusting of a metal can, (b) boiling a cupof water, (c) pulverizing an aspirin, (d) digesting a candy bar,(e) exploding of nitroglyerin.arrow_forwardClassify each statement as an observation, a law, or a theory. Neon is an inert (or nonreactive) gas.arrow_forwardcoffee (with milk) a. suspension b. solution c. an element d. heterogeneous mixturearrow_forward
- Q/ Label each as a physical property or a chemical property. a) Gasoline evaporates quickly. ____________________b) Methanol is toxic when ingested. ____________________c) Road salt accelerates the rusting of an old car. ____________________d) Sunlight feels warm.arrow_forwardWhen oil and water are mixed together they form a (an) a. Homogeneous mixture b. Heterogeneousmixture c. Compound d. Elementarrow_forwardHow does the International System (SI) obtain units of different size from a given unit? How does the International System obtain units for all possible physical quantities from only seven base units?arrow_forward
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