Which of the following type of matter/classification of matter pairs is incorrectly matched?
type of matter classification of matter
A) pure gold element
B) concrete homogeneous mixture
C) fruitcake heterogeneous mixture
D) saline solution homogeneous mixture
The correct answer and explanation is :
The incorrect match is:
B) concrete homogeneous mixture.
Explanation:
To understand why this pairing is incorrect, we need to first review the definitions of different types of matter and their classifications:
- Pure Gold (Element):
- Gold (Au) is a pure substance made up of only one type of atom, and since it cannot be separated into different components without changing its properties, it is classified as an element. This match is correct.
- Concrete (Homogeneous Mixture):
- Concrete is a heterogeneous mixture because it consists of different components, such as cement, water, sand, gravel, and additives. These components are not uniformly distributed throughout the mixture, and you can often see or feel the differences between them. Therefore, concrete does not have the uniform composition required for a homogeneous mixture. This is the incorrect match.
- Fruitcake (Heterogeneous Mixture):
- A fruitcake is a classic example of a heterogeneous mixture, as it contains distinct ingredients such as nuts, fruits, and cake batter, and these parts are not uniformly mixed. The individual components of the fruitcake are visible or distinguishable in some way, so it’s correctly classified as a heterogeneous mixture.
- Saline Solution (Homogeneous Mixture):
- A saline solution is formed by dissolving salt (NaCl) in water (H2O). The salt dissolves completely, and the resulting mixture has a uniform composition throughout, meaning it is a homogeneous mixture. This match is correct.
In summary:
- A homogeneous mixture has a uniform composition, where the components are evenly distributed, such as in a saline solution.
- A heterogeneous mixture consists of visibly different components, as seen in concrete and fruitcake.
- An element is a pure substance, like pure gold, which consists of only one type of atom.
The incorrect match is B) concrete homogeneous mixture because concrete is a heterogeneous mixture, not a homogeneous one.