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Questions in chemistry

[Terjawab] Which is a pure substance? A. soda B. gasoline C. salt water D. carbon dioxide

[Terjawab] In an experiment, 1.288 g of copper oxide was obtained from 1.03 g of Cu. In another experiment, 3.672 g of copper oxide gave on reduction 2.938 g of copper. Which law of chemical combination can be illustrated by this example? (1) Law of conservation of mass (2) Law of constant proportion (3) Law of multiple proportion (4) None of these

[Terjawab] A compound with molar mass 159 was found to contain 39.62% Copper and 20.13% Sulfur. Suggest the molecular formula. Given atomic masses: Cu = 63, S = 32, and O = 16.

[Terjawab] Which are the products in the equation [tex]CH _3 SH +4 O _2 \rightarrow CO _2+ SO _2+2 H _2 O[/tex]? Check all that apply. [tex]CH _3 SH[/tex] [tex]O _2[/tex] [tex]CO _2[/tex] [tex]SO _2[/tex] [tex]H _2 O[/tex]

[Terjawab] Which of the following is not a correct perspective representation of a stereoisomer of 2,3-dibromobutane? A. B. C. D.

[Terjawab] What is the difference between concentrated and dilute acids? When diluting acids, why do we always add the acid slowly to the water?

[Terjawab] Elements with 1, 2, or 3 valence electrons usually make excellent... (a) Neutral (b) insulators (c) semiconductors (d) conductors

[Terjawab] Convert structures 1 and 2 Newman projections to the corresponding line-angle formula. Determine the appropriate IUPAC name for each formula. Structure 1 Structure 2 Which of the following is correct? A. 2-methylpentane B. n-propane C. 2,2-dimethylbutane D. 3-methylpentane E. 2-methylpropane

[Terjawab] Which of the following choices is/are true about the following compounds: I. II. III. IV. a. the following is the correct order of decreasing reactivity toward HBr addition: III > II > IV>I b. all the above compounds are unsaturated hydrocarbons c. the following is the correct order of increasing reactivity toward HBr addition: I d. all the above compounds have the same reactivity toward HBr addition e. compound I does not undergo addition reaction under any condition

[Terjawab] Which type of reaction has the general formula of [tex]A B+C D \rightarrow A D+C B[/tex] ? synthesis decomposition oxidation replacement