Classify each substance as a pure substance or a mixture. If it is a pure substance, classify it as an element or a compound. If it is a mixture, classify it as homogeneous or heterogeneous.
A. Wine
B. Beef stew
C. Iron
D. Carbon monoxide
The Correct Answer and Explanation is:
To classify each of the given substances, we will determine if they are pure substances or mixtures, and if they are pure substances, whether they are elements or compounds. For mixtures, we will identify if they are homogeneous or heterogeneous.
A. Wine
Classification: Mixture (Homogeneous)
Explanation: Wine is a mixture because it consists of various components, including water, alcohol (ethanol), sugars, acids, and various flavor compounds derived from grapes. It is considered a homogeneous mixture because the different components are uniformly distributed throughout the solution. When wine is poured into a glass, it appears consistent in composition and does not separate into distinct layers or components, thus meeting the criteria for a homogeneous mixture.
B. Beef Stew
Classification: Mixture (Heterogeneous)
Explanation: Beef stew is classified as a heterogeneous mixture. This type of mixture contains various ingredients such as beef, vegetables (like carrots, potatoes, and onions), broth, and seasonings. In a heterogeneous mixture, the different components can be identified and are not uniformly distributed. In a beef stew, the pieces of meat and vegetables can be seen, and their proportions can vary throughout the dish, making it a classic example of a heterogeneous mixture.
C. Iron
Classification: Pure Substance (Element)
Explanation: Iron is classified as a pure substance and is specifically categorized as an element. Elements are substances that cannot be broken down into simpler substances by chemical means. Iron, represented by the symbol Fe on the periodic table, consists of only iron atoms and possesses distinct physical and chemical properties, such as metallic luster and malleability. Being an element, it is a fundamental building block of matter.
D. Carbon Monoxide
Classification: Pure Substance (Compound)
Explanation: Carbon monoxide (CO) is classified as a pure substance and is specifically a compound. Compounds are formed when two or more different elements chemically combine in a fixed ratio. In the case of carbon monoxide, it consists of one carbon atom and one oxygen atom, bonded together. This compound has distinct properties, including its colorless, odorless nature and its toxicity when inhaled in sufficient quantities. Being a compound, it can be decomposed into its constituent elements (carbon and oxygen) through chemical reactions.
In summary:
- Wine: Mixture (Homogeneous)
- Beef Stew: Mixture (Heterogeneous)
- Iron: Pure Substance (Element)
- Carbon Monoxide: Pure Substance (Compound)