Which of these terms, (i) mixture, (ii) solid, (iii) liquid, (iv) gas, (v) chemical element, (vi) chemical compound, applies to the following substances at room temperature? a. Gasoline b. Iodine c. Water d. Air e. Blood f. Sodium bicarbonate g. Gaseous ammonia h. Silicon

The states of matter refer to the distinct forms that different phases of matter take on. At room temperature, substances can exist as solids, liquids, or gases. Understanding these states is crucial for classifying substances like water (liquid) and iodine (solid) based on their physical properties.

A mixture consists of two or more substances that are physically combined, while a pure substance has a uniform and definite composition. For example, air is a mixture of gases, whereas sodium bicarbonate is a pure chemical compound. Recognizing this distinction helps in categorizing substances like blood (a complex mixture) and silicon (a pure element).

Chemical elements are pure substances that cannot be broken down into simpler substances, while chemical compounds are formed when two or more elements chemically bond together. For instance, water is a compound made of hydrogen and oxygen, whereas iodine is an element. This understanding is essential for identifying substances like gaseous ammonia (a compound) and sodium bicarbonate (also a compound).