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Which statement describes the components of a mixture?*
Distillation of crude oil from various parts of the world yields different percentages of hydrocarbons. Which statement explains these different percentages?*
The ratio of chromium to iron to carbon varies among the different types of stainless steel. Therefore, stainless steel is classified as*
Powdered iron is magnetic, but powdered sulfur is not. What occurs when they form a mixture in a beaker at room temperature?*
Salt water is classified as a*
Powdered sulfur is yellow, and powdered iron is gray. When powdered sulfur and powdered iron are mixed at 20°C, the powdered iron*
Base your answers to questions 7 on the information below and on your knowledge of chemistry.
Rubbing alcohol sold in stores is aqueous 2-propanol, CH3CHOHCH3(aq). Rubbing alcohol is available in concentrations of 70.% and 91% 2-propanol by volume.
To make 100. mL of 70.% aqueous 2-propanol, 70. mL of 2-propanol is diluted with enough water to produce a total volume of 100. mL. In a laboratory investigation, a student is given a 132-mL sample of 91% aqueous 2-propanol to separate using the process of distillation.
State evidence that indicates the proportions of the components in rubbing alcohol can vary.*