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Copy of Physical and Chemical Changes

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Amy Nguyen

on 28 May 2013

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Transcript of Copy of Physical and Chemical Changes

Physical and Chemical Changes By: Crystal Rubio, Natalie Popov and Amy Nguyen You can tell when a chemical change has taken place if... Chemical change are almost impossible to reverse. One example is a firework. Once a firework, explodes it cannot be reversed. No matter how hard you try to put back together the Thank you for listening and watching! Baking Brownies... What are physical and chemical changes? What are signs of chemical change? Reversibility of Chemical Changes Sketches A physical Change is a change from one state of matter to another without a change in chemical composition. A chemical Change is a change between one or more substances that result in entirely new substances with different properties. What's the difference? In physical changes, the identity/chemical composition of the matter does NOT change, new substances are NOT produced, and they are EASILY reversed. In chemical changes, the chemical composition of the matter DOES change, new substances with different properties ARE formed, and they are DIFFICULT to be reversed. Physical Changes Like we've mentioned before, physical changes are changes in which no new substances are formed. For example, when ice cubes are melted, their shapes and sizes may have changed, but they are still made of water. Another example can be seen through ice cream. If you are eating your ice cream outside on a hot summer day, the ice cream will begin to melt and turn into a liquid. However, the sticky liquid is still ice cream. When mixing lemonade powder with water, the powder may seem to dissolve into the water, however, the lemonade powder is still inside the drink. What are the different types of physical changes? The five main physical changes are...
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 Thermal/Electrical Conductivity - ability of a substance to conduct heat
Ductility - ability to be drawn into wires
Malleability - ability to be rolled or pounded into different shapes
Solubility - ability to dissolve into something (usually a substance)
Density - mass/volume
Hardness Chemical Changes Due to the fact that the identity of the matter does not change during a physical change, most of these 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: fresh baked 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 Odor, taste, or color changes
Fizzing/bubbles appear
Sound/light is emitted
Heat is emitted or absorbed
A change in melting point or boiling point occurs
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