Analysis of an Unknown Substance Showed That It Has a High

question 59

Multiple Choice

Analysis of an unknown substance showed that it has a high boiling point and is brittle. It is an insulator as a solid but conducts electricity when melted. Which of the following substances would have those characteristics?

• A)HCl
• B)Al
• C)KBr
• D)SiF ₄
• E)I ₂

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Definitions:

Confidence Interval

A range of values, derived from sample statistics, that is likely to contain the value of an unknown population parameter, with a given level of confidence.

Ethanol

A volatile, flammable, colorless liquid commonly used as a fuel and in chemical synthesis, and also found in alcoholic beverages.

Disinfectant

A chemical agent used to eliminate or significantly reduce the presence of pathogenic microorganisms on surfaces or objects.

Bacterial Contamination

Bacterial contamination refers to the undesirable presence of bacteria in a substance, environment, or object, which can pose health risks.