PSI Barbering Practice Exam

Metals, minerals, water, air, and ammonia are all examples of what type of substances?

1. Organic

2. Inorganic

3. Bioactive

4. Natural

The correct answer is: Inorganic

The correct answer is that metals, minerals, water, air, and ammonia are all classified as inorganic substances. Inorganic substances are defined as compounds that generally do not contain carbon-hydrogen bonds, which differentiates them from organic substances. Metals and minerals represent elements and compounds found in nature that do not arise from living organisms. Water, being a simple molecule made of hydrogen and oxygen, also falls under inorganic substances due to its lack of carbon. Similarly, air, which is a mixture of various gases including nitrogen and oxygen, is considered inorganic as it does not contain carbon bonds. Ammonia, a compound consisting of nitrogen and hydrogen, is another example of an inorganic substance since it lacks the carbon-hydrogen component required for organic classification. Understanding these classifications is important in fields such as chemistry and biology, where the properties and interactions of substances are crucial for applications in various practical contexts, including those relevant to barbering, like the understanding of chemical reactions in hair products and treatments.