CHM 141H Lecture Notes - Lecture 1: Chemical Equation, Chemical Formula, Centrifugation

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grayskunk775

27 Dec 2018

School

Miami University

Department

Chemistry & Biochemistry

Course

CHM 141H

Professor

Chris Zu

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Document Summary

Pure substances: element: a pure substance that cannot be separated into simpler substances by any chemical process, compound, pure substance composed of two of more elements bonded together in fixed proportions. It can be broken down into individual elements by chemical means. Mixtures: homogeneous, components are distributed uniformly throughout the sample and have no visible boundaries or regions, also called a solution, heterogeneous: components are not distributed uniformly and may have distinct regions of different composition. Chemical reactions: the transformation of one or more substances into different substances, chemical equation, use chemical formulas to express the identities of substances involved in a reaction, use coefficients to indicated quantities of substances involved in a reaction. Law of constant composition: all samples of a particular compound contain the same elements combined in the same proportions. Compounds: some compounds consist of positively or negatively charged particles called ions, cations: positively charged ions, anions: negatively charged ions.

Related Questions

Based on the information given, classify each of the pure substances as elements or compounds, or indicate that no such classification is possible because of insufficient information. Analysis with an elaborate instrument indicates that â¢Substance A contains two elements. â¢Substance B and Substance C react to give a new Substance D. â¢Substance E decomposes upon heating to give Substance F and Substance G. â¢heating Substance H to 1000Â°C causes no change. â¢Substance I cannot be broken down into simpler substances by chemical means. â¢Substance J cannot be broken down into simpler substances by physical means. â¢heating Substance K to 500Â°C causes it to change from a solid to a liquid.

crimsonmink784

Based on the information given, classify each of the pure substances as elements or compounds, or indicate that no such classification is possible because of insufficient information. Analysis with an elaborate instrument indicates that substance A contains two elements. substance B and substance C react to give a new substance D. substance E decomposes upon heating to give substance F and substance G. heating substance H to 1000 ∘C causes no change. substance I cannot be broken down into simpler substances by chemical means. substance J cannot be broken down into simpler substances by physical means. heating substance K to 500 ∘C causes it to change from a solid to a liquid.

azureferret874

Which of the following demonstrates that an unknown solid sample is a chemical compound? (2.63pts)

a. it cannot be broken down into simpler substances by chemical means

b. it cannot be broken down into simpler substances by physical means

c. heating the substance causes it to melt

d. heating the substance causes no visible change

CHM 141H Lecture Notes - Lecture 1: Chemical Equation, Chemical Formula, Centrifugation

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