Chapter 1, Problem 1.7E

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

Convert following into scientific notation: 850

Which 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.

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.

Classify each statement as an observation, a law, or a theory. Neon is an inert (or nonreactive) gas.

coffee (with milk) a. suspension b. solution c. an element d. heterogeneous mixture

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.

When oil and water are mixed together they form a (an) a. Homogeneous mixture b. Heterogeneousmixture c. Compound d. Element

How 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?