Chemical Properties (Science Experiments)
What happens during a chemical reaction?
Chemical Reactions: What happens when mineral oil, water, and iodine mix?
How many ways can you describe a substance? Two common ways are by listing its physical properties and its chemical properties. A physical propertyA characteristic that you can detect with your senses, such as color and shape. is a characteristic of a substance that you can detect with your senses, such as its color, shape, size, smell, taste, texture, temperature, density, or volume. For example, a lemon is yellow, oval-shaped, and smaller than a grapefruit. It has a sharp smell and a rough texture.
A changes a physical property but does not change the identity or molecular makeup of the substance. One example of a physical change is salt crystals dissolving in water, which changes their shape. When the water evaporates, you can see the salt crystals again, unchanged by being dissolved in the water. Tearing paper into small pieces is also a physical change. The bits of paper look different, but they are still composed of the same molecules as when they were joined together.
(The entire section is 3040 words.)
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