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Hydrogen is a colorless, odorless gas at room temperature. It can become a liquid or solid at very low temperatures. Hydrogen is the lightest element and is highly flammable.
Most physical changes are reversible because they involve only changes in the physical state or appearance of a substance, rather than its chemical composition. Reversible changes usually involve processes like melting, freezing, dissolving, or changes in shape, which can be easily reversed by applying the appropriate conditions to change the substance back to its original state.
Physical properties of hydrogen peroxide include being a colorless liquid, having a slightly sharp odor, and being miscible with water.
Hydrogen is a gas at room temperature and does not have a solid or liquid form, so it does not have a physical texture like a solid or liquid substance.
A physical change is a type of matter change in which the substance's chemical composition remains the same, and no new substances are formed. Examples of physical changes include changes in state (solid to liquid), changes in shape, or changes in size.
When you combust hydrogen in air, the hydrogen will combine with oxygen to form water. Therefore, the hydrogen and oxygen are undergoing a chemical change to become bonded together producing H2O: 2H2 + O2 → 2H2O + Heat