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Physical and Chemical Changes
Transcript of Physical and Chemical Changes
boiling During a physical change, the physical properties of the matter changes. A physical property is a characteristic that can be observed without a change in the matter's identity. More about Physical Properties Physical properties can be used to describe physical changes. These properties include: Reversibility Ductility - ability to be drawn into wires
Thermal/Electrical Conductivity - ability of a substance to conduct heat
Malleability - ability to be rolled or pounded into different shapes
Solubility - ability to dissolve into something (usually a substance)
and the substances'...
Density - mass/volume
Hardness Chemical Changes Due to the fact that the identity of the matter does not change during a physical change, most physical changes are easy to reverse. For example: In all chemical changes, new substances with different properties are formed. When an ice cube is left in the sun, the heat from the sun will will melt the ice cube... However, if you were to the liquid and put it into an ice tray inside the freezer, and eventually, all that is left is water. after a couple of hours, the water will freeze and retain its original shape and form as an ice cube. For example, when live bacterial cultures are added to milk, after a certain amount of time, the milk and bacteria will develop a type of acid that helps to form a new, thicker substance: yogurt. Another example can be seen through mixing vinegar and baking soda. The vinegar reacts with the baking soda and creates a new gas substance: carbon dioxide. and result in a totally different substance: denser and thicker brownies! When making brownies, you combine ingredients, such as eggs, sugar, and flour to create a raw batter. Once the batter is put into a heated oven, the ingredients will react with the heat A substance's odor, taste, or color changes
Sound/light is emitted
Heat is emitted or absorbed by the substance
A change in melting point or boiling point occurs Soured milk - if a carton of milk is not finished by the expiration date, the milk will sour. As the milk sours, both the taste and smell of the milk will change.