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Presentation on theme: "=detail&id=960B953BECE70277F640231B3EB2DF56B0CCF2EA&selectedIndex=18."— Presentation transcript:

1 http://www.bing.com/images/search?q=bread+and+ginger+funny+pic&qpvt=bread+and+ginger+funny+pic&FORM=IGRE&adlt=strict#view =detail&id=960B953BECE70277F640231B3EB2DF56B0CCF2EA&selectedIndex=18

2 Quick recap of yesterday’s demo  http://www.youtube.com/watch?v=jJvS4uc4T bU http://www.youtube.com/watch?v=jJvS4uc4T bU

3 Homework  On page 157 is the reading in green  Sidebar “The Chemistry of Fireworks”  Notes and Summary  Starting on page 156-157  Reflect and Connect #1-5  Question and Answers written  Both in Complete Sentences  Complete sentences do NOT begin with “Yes,…..” or “No, ……”

4 Reflect and Connect pg 156  1. How are the flame tests similar to fireworks? How are they different?  2. How could you use flame tests to organize metallic elements found on Earth?  3. What differences among the atoms of sodium, potassium, strontium, calcium, and copper could lead to differences in flame test colors?  4. Why doesn’t water produce color in a flame test?  5. What questions do you still have regarding how some atoms produce color in a flame?

5 Reflect and Connect pg 156  1. How are the flame tests similar to fireworks? How are they different?  Both the flames from the demo and the flames from fireworks must contain enough energy to cause some sort of change in the metal ions placed in either flame.  This change in the metal ions gives off light of colors that are only found with the metal in question.  Fireworks displays multiple colors, while the flame tests show only one color. This is probably due to fireworks containing more than one metal in them.

6 Reflect and Connect pg 156  2. How could you use flame tests to organize metallic elements found on Earth?  Flame test colors could be used to categorize metallic elements by grouping them according to colors.  Ex: all metals with yellow flame test might form one group and all metals with a red flame test could form another  This type of organization does not match the periodic table of the elements and that is why it’s not used

7 Reflect and Connect pg 156  3. What differences among the atoms of sodium, potassium, strontium, calcium, and copper could lead to differences in flame test colors?  The metal atoms used in this demo are different in their physical properties such as hardness, melting point, and density. Each atom has a different number of protons and electrons.

8 Reflect and Connect pg 156  4. Why doesn’t water produce color in a flame test?  The water doesn’t produce color because whatever it is that that the flame does to the metal ions, it does not do to water.  The energy of the flame was not enough energy to produce color. We don’t yet know the exact reason for producing color.  There is a difference in ionization energies between water and the metal ions

9 Reflect and Connect pg 156  5. What questions do you still have regarding how some atoms produce color in a flame?  Why don’t chloride ions produce color?  Do any negative ions produce color in a flame?  Do the metal ions react with compounds in the air to make color?

10 Explore

11 Update your TOC: EXPLORE: EMITTING THE TRUTH Start your new Header Page on the RIGHT SIDE of your notebook. Learning Target: I will begin to understand what color tells us about the underlying structure of matter I will understand how the atomic structure can relate to flame colors.

12 Different elements an their spectra lines  http://chemlinks.beloit.edu/BlueLight/ moviepages/ab_em_el.htm http://chemlinks.beloit.edu/BlueLight/ moviepages/ab_em_el.htm

13 Emitting to the Truth  Read the Introduction p. 158 & 159

14 Emitting to the Truth  We are going to be looking at different sources of light.  Incandescent light bulb:  an electric light  produces light with a filament wire which is heated to a high temperature by an electric current passing through it.  Which makes it glow  Continuous spectrum  All wavelengths are present in the light that is emitted.

15 Emitting to the Truth  fluorescent light bulb:  an low pressure gas filled lamp that uses fluorescence to produce visible light.  produces thin line spectra with some continuous spectra between the bright lines.

16 Emitting to the Truth  sunlight:  a portion of the electromagnetic radiation given off by the Sun  Particularly:  infrared, visible, and ultraviolet light.

17 Emitting to the Truth  We will be using a spectroscope, which is an instrument that separates light into its principal wavelengths.

18 Emitting to the Truth  The spectroscope will show the spectrum of colors that make up the light that is being studied.  spectrum: the range of colors observed when white light is dispersed through a prism  Spectra is the plural of spectrum.

19 Emitting to the Truth  Each element has a unique spectrum.  Spectra are like fingerprints.  Spectra are characteristic properties of substances and can be used to identify an element.

20 Emitting to the Truth  Your spectroscope has a scale on it to show the wavelength of each color that makes up the light source.  The lines that appear are called spectral lines.

21 Emitting to the Truth  Wavelength  Is the distance between the crests of waves  Determines the type of electromagnetic energy

22 Emitting to the Truth  Electromagnetic spectrum  Visible light is a small portion of the electromagnetic spectrum  The color depends on the wavelength

23 Emitting to the Truth  Let’s look at the spectra for different elements: Emission Spectra of Elements Beloit College Emission & Absorption Spectra Light 1 Light 2 Light 3 Light 4

24 Emitting to the Truth  Fluorescent tubes contain specific elements… producing thin line spectra.  ››Incandescent Light bulbs have a thin wire through which electricity runs and burns white- hot… like a campfire, or like the sun!  Remember that each color has a different wavelength, which means a different amount of energy…  ›Emission spectra can tell us about the composition of objects… like stars for instance!

25 Energy: The Ultimate Quick Change Artist  Energy is the ability to do work  Energy can be measured only by what it does  Energy is abstract - you cannot see it but you can detect it by the changes it effects  Energy can cause changes in temperature, height, velocity, bonds in a molecule, the state of an electron around an atom  Energy is not created or destroyed - it just changes forms  You observe energy changes which lead you to make conclusions about how energy is distributed.


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