Which of the following is true of a compound?

A compound must be solid at room temperature

A compound is a substance that cannot be separated into simpler substances by chemical means

A compound is a combination of two or more substances in which the substances retain their distinct identities

A compound is a substance composed of atoms of two or more elements chemically united in a fixed ratio

A compound must be heterogeneous

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Christian TusoLv10

19 Jan 2021

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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

Indicate whether the following samples of matter is a heterogeneous mixture, a homogeneous mixture, a compound, or an element.

a. a blue-colored, single-phase liquid that when boiled away (evaporated) leaves behind a solid residue

b. a "cloudy" liquid that separates into two layers upon standing overnight

c. a non-uniform, white crystalline substance, part of which dissolved in alcohol and part of which does not dissolve in alcohol

d. a colorless gas that cannot be separated into simpler substances using physical means and that reacts with metal magnesium to produce both magnesium-oxygen compound and a magnesium-nitrogen compound

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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.