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What are chemical properties of a substance?
Chemical properties, such as combustibility, are generally observed as the identity of a substance changes and one or more new substances form. Which uses of iron are due to its chemical properties?
Can changes in physical properties change the chemical composition of a substance?
Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same. The descriptions below explain two ways that water is used by plants on a sunny day.
What are some examples of chemical changes in nature?
Iron has a tendency to rust. Rainwater in industrialized regions tends to be acidic. Hemoglobin molecules have a red color. When a glass of water is left out in the sun, the water gradually disappears. Carbon dioxide in air is converted to more complex molecules by plants during
Does water undergo a chemical change but keep its identity?
In transpiration, because some of its properties change, water undergoes a physical change but keeps its identity. In photosynthesis, because its identity changes, water undergoes a chemical change. Which statement describes all chemical changes, but not all physical changes?