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Chemistry Do Now Directions: Take out a sheet of notebook (Do Now sheet) and set it up as instructed. Answer the following questions. (5 minutes) Suppose you had a mixture of water, salt, pepper and iron filings mixed together. Explain how you could separate them back out. In your explanation, you have any tools or equipment available.
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Chemistry Do Now Suppose you had a mixture of water, salt, pepper and iron filings mixed together. Explain how you could separate them back out. In your explanation, you have any tools or equipment available.
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Objective Students will know how matter is classified by taking notes and completing a POGIL. Mastery Level: 75% or better
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Homework Complete unfinished POGIL.
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Engage – Based on the do now, classify this bacon cheeseburger as a homogeneous or heterogeneous mixture.
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Students will read an article on light spectrum and will answer the TDQs/quiz questions. Students will me the answers to the quiz questions. explore
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Last night’s Homework Go to:
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Light Spectrum Test Quiz
1) The ________ of a light wave is how fast it goes up and down. Wavelength Period Amplitude Frequency Velocity
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Light Spectrum Test Quiz
1) The ________ of a light wave is how fast it goes up and down. Wavelength Period Amplitude Frequency Velocity
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Light Spectrum Test Quiz
2) If a wave has a low frequency it will have a ________. Short wavelength High amplitude Long wavelength Low amplitude High velocity
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Light Spectrum Test Quiz
2) If a wave has a low frequency it will have a ________. Short wavelength High amplitude Long wavelength Low amplitude High velocity
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Light Spectrum Test Quiz
3) What do we call the range of light frequencies that we can see? Visible spectrum Audible spectrum Open spectrum Chromatic spectrum Electromagnetic spectrum
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Light Spectrum Test Quiz
3) What do we call the range of light frequencies that we can see? Visible spectrum Audible spectrum Open spectrum Chromatic spectrum Electromagnetic spectrum
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Light Spectrum Test Quiz
4) Which of the following electromagnetic waves are invisible to the human eye? Radio waves Microwaves Infrared rays X-rays All of the above
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Light Spectrum Test Quiz
4) Which of the following electromagnetic waves are invisible to the human eye? Radio waves Microwaves Infrared rays X-rays All of the above
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Light Spectrum Test Quiz
5) What color comes between yellow and blue on the visible spectrum of light? Red Orange Green Indigo Violet
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Light Spectrum Test Quiz
5) What color comes between yellow and blue on the visible spectrum of light? Red Orange Green Indigo Violet
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Light Spectrum Test Quiz
6) What color comes between blue and violet on the visible spectrum of light? Red Orange Green Indigo Violet
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Light Spectrum Test Quiz
6) What color comes between blue and violet on the visible spectrum of light? Red Orange Green Indigo Violet
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Light Spectrum Test Quiz
7) The color white is a mixture of what colors of light? Red and Green Indigo and violet Blue and yellow Blue and orange All of the colors
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Light Spectrum Test Quiz
7) The color white is a mixture of what colors of light? Red and Green Indigo and violet Blue and yellow Blue and orange All of the colors
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Light Spectrum Test Quiz
8) When we see a red shirt, what color (or colors) of light is the shirt reflecting? Red Red and green Blue and yellow Yellow All of the colors except red
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Light Spectrum Test Quiz
8) When we see a red shirt, what color (or colors) of light is the shirt reflecting? Red Red and green Blue and yellow Yellow All of the colors except red
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Light Spectrum Test Quiz
9) What color will we see if an object is absorbing all of the colors of light? White Black Red Blue Brown
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Light Spectrum Test Quiz
9) What color will we see if an object is absorbing all of the colors of light? White Black Red Blue Brown
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Light Spectrum Test Quiz
10) What are the three additive primary colors? Yellow, red, and blue Yellow, green, and red Red, blue, and green Orange, green, and indigo Orange, yellow, and red
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Light Spectrum Test Quiz
10) What are the three additive primary colors? Yellow, red, and blue Yellow, green, and red Red, blue, and green Orange, green, and indigo Orange, yellow, and red
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Classification of Matter
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Classification of Matter
Now that we have defined chemical and physical properties of matter, we can use that to help us classify it. One way chemists classify matter is based on its purity.
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Classification of Matter
Pure Substance – Matter that has only 1 set of chemical and physical properties. Example: Pure water always has the exact same chemical and physical properties under the same conditions. If water ever tastes different then it isn’t pure water; it fits into our next category.
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Classification of Matter
Mixture – Two or more pue substances mixed together. Each substance in the mixture retains its own set of chemical and physical properties. Even though it may look different, it is still copper and zinc. Each metal retains its own properties like melting point. Example: Copper and Zinc can be mixed together to produce brass.
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Classification of Matter
Mixture – Two or more pure substances mixed together. Each substance in the mixture retains its own set of chemical and physical properties. Unlike pure substances, mixtures can always be separated by physical means. How could we separate the copper and zinc back out?
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Mixtures Mixture – Two or more pure substances mixed together. Each substance in the mixture retains its own set of chemical and physical properties. If a sample of sand contains iron and salt, how could you separate them from the other minerals?
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Mixtures Some mixtures are more pure than others.
Heterogeneous mixture – Uneven distribution of substances. (Very impure) - You can see the different parts. Examples: Sand Granite Wood
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Mixtures Some mixtures are more pure than others.
Heterogeneous mixture – Uneven distribution of substances. (Very impure) - You can see the different parts. Examples: Milk Blood
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Mixtures Homogeneous Mixture – Components are evenly mixed. (More pure than heterogeneous) - Cannot see the parts. Salt water contains salt and water, but are mixed all the way to the atomic level , but it can still be separated by physical means. Seawater distillation plant
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Pure Substances Pure substances can also be divided into 2 categories: compounds and elements.
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Pure Substances Compound – Two or more elements chemically bonded together. Examples: Carbon Dioxide (CO2) Water (H2O) Salt (NaCl) Sucrose (C12H22O11)
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Pure Substances Compounds have only 1 set of properties. They cannot be separated by any physical process. - Can only be separated by a chemical reaction. Water can be separated into Hydrogen and Oxygen by a process called Electrolysis.
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Pure Substances Elements – Substances made up of only one type of atom. - Cannot be separated by any physical OR chemical process. Examples: Carbon Helium Gold
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Heterogeneous Mixture
Matter Can be separated physically Cannot be separated physically Mixture Pure Substance Cannot see the parts Can be separated chemically Can see the parts Cannot be separated Heterogeneous Mixture Homogeneous Mixture Compound Element Most impure Most pure
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Extension & evaluation
Classification of matter, mixtures (homogeneous and heterogeneous) POGIL Extension & evaluation
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