(Au + H 2O -> no reaction) This is nice to know since so much of our jewelry is made from gold! For example, gold metal doesn’t react with water at all. Sometimes it is very important to know that a material doesn’t possess a chemical property. There is a “flip side” to chemical properties that should be considered. (2Na + 2H 2O -> H 2 + 2NaOH) This reaction produces a change in composition as neither of the substances produced has the same make-up as the original water or sodium. For example, sodium metal reacts vigorously with water to produce hydrogen and sodium hydroxide. Another way of saying this is that chemical properties determine the changes that substances undergo when they participate in chemical reactions. For example, we can say that water is a colorless, odorless, tasteless gas (qualitative) that freezes at 0 oC and boils at 100 oC (quantitative).Ĭhemical properties are those characteristics that can only be observed when the substance is undergoing a change in composition. Both qualitative adjectives and quantitative numbers can be used when we list physical properties. There are dozens of different physical properties, but odor, color, texture, and boiling point are some familiar ones. Physical properties are those characteristics that we can observe and measure without changing the composition of the substance. So let’s look at these properties in more detail. If asked to distinguish between the two types, you might have some difficulty deciding if a property is physical or chemical. You might already be familiar with some physical and chemical characteristics, but others you’ve maybe never heard of.
We use these properties to help us identify materials as well as describe them. In order to understand and use the many materials around us, we need an understanding of their physical and chemical characteristics or properties.
#Physical and chemical properties and changes how to#
Clickable Periodic Table showing Trends.Notes - Atomic Structure & the Periodic Table.Video - Periodic Changes in Atomic Size.Alternative Forms of the Periodic Table.Discovering the Elements - Table with Slider.Mendeleyev & Development of the Periodic Table.Periodic Table - History & Arrangements.Electron Configuration - use the slider to see different elements.Bright Line Spectrums - click on button on RIGHT.Video (1 min) - Rutherford's Gold Foil Experiment.Video (2 min) Thomson's Equipment: Cathode Ray Tube.Chapter 4a - History of Atomic Structure.Characteristics of Metals and Nonmetals.Heterogeneous or Homogeneous? (Practice).Chapter 2 - Introduction (Safety, Lab Tech., Measurements, etc).Characteristics of Solids, Liquids, Gases.
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