Classify each of the following as a pure substance or a mixture; if it is a mixture, state whether it is heterogeneous or homogeneous: (a) concrete, (b) tomato juice, (c) marble (d) seawater, and (e) iron.
The Correct Answer and Explanation is :
Let’s classify each substance and provide an explanation:
(a) Concrete:
Classification: Mixture (Heterogeneous)
Explanation: Concrete is a mixture of various substances, such as cement, sand, gravel, and water. The individual components retain their distinct properties and do not combine to form a uniform structure. In a heterogeneous mixture like concrete, the components are visibly different from one another, and the distribution of the components may vary in different samples of concrete.
(b) Tomato Juice:
Classification: Mixture (Homogeneous)
Explanation: Tomato juice, though it may have small solid particles like pulp, forms a homogeneous mixture. After blending or processing, the particles dissolve or break down enough that the liquid appears uniform. Even if some separation occurs, the juice still remains mostly homogeneous in appearance. It is classified as a homogeneous mixture because the solute (solids) is evenly distributed throughout the solvent (liquid).
(c) Marble:
Classification: Pure Substance (Compound)
Explanation: Marble is a naturally occurring, metamorphic rock primarily composed of calcium carbonate (CaCO₃). It has a consistent chemical composition and is considered a pure substance in its natural state, with the arrangement of the atoms forming a crystalline structure. Even though marble may have some visible variations in texture or color due to impurities, it is fundamentally a pure substance because the main component is uniform.
(d) Seawater:
Classification: Mixture (Homogeneous)
Explanation: Seawater is a homogeneous mixture composed of water and various dissolved salts, minerals, and gases. The dissolved components are distributed evenly, so the solution appears uniform. Even though seawater contains different minerals, the ions and molecules are dissolved to such an extent that they form a consistent composition, making it a homogeneous mixture.
(e) Iron:
Classification: Pure Substance (Element)
Explanation: Iron is an element, represented by the symbol Fe on the periodic table. As an element, it consists of only one type of atom and cannot be broken down into simpler substances. It is a pure substance, with a consistent composition throughout.
Image Representation:
I’ll now generate an image showing the classification of each substance for a clearer visual representation.
Here is the educational diagram showing the classification of substances. It visualizes each substance (concrete, tomato juice, marble, seawater, and iron) with their respective classification as mixtures or pure substances, and further categorizes them as homogeneous or heterogeneous mixtures. Let me know if you’d like further details or adjustments!
