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Mixtures and Pure Substances

Mixtures and Pure Substances. Beverage Lab. Matter. Properties. Homogeneous materials. Heterogeneous materials. From Yesterday …. { One set of properties}. { More than one set of properties}. Research Questions:. Is milk homogeneous or heterogeneous?.

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Mixtures and Pure Substances

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  1. Mixtures and Pure Substances Beverage Lab

  2. Matter Properties Homogeneous materials Heterogeneous materials From Yesterday … {One set of properties} {More than one set of properties}

  3. Research Questions: Is milk homogeneous or heterogeneous? Is OJ homogeneous or heterogeneous? Is Pop homogeneous or heterogeneous?

  4. Lab Guidelines • DO NOT taste the 3 liquids • DO NOT spill the liquids • BE CAREFUL when handling glassware and microscope Working with your partner: • Stay on task • Keep your voice low • Allow your partner to share ideas, even if you think you know the answer

  5. Preparing your Three Slides • Using the dropper, take a drop of the beverage and place it in the centre of the slide. • Gently place a cover slip on the slide • When finished looking at your sample, rinse your slide and dry it with lens tissue

  6. Microscope Use • Turn revolving nosepiece so that the lowest power objective is clicked into place • Place the prepared microscope slide on the stage and fasten the stage clips. • Lower the objective as far as it will go without touching the slide • Look from the side when doing this • Now look through the eye piece and adjust the diaphragm for the greatest amount of light • Slowly turn the coarse adjustment so that the objective lens goes up • If you cannot see beverage clearly, start at number 3 using the next highest power objective.

  7. Questions • When you examined the drinks with your unaided eye: - Which bits were big, small, or microscopic? - Were the bits all the same shape? - Explain which bits were solids, liquids, or gases. • Which drink appeared to be homogeneous until you saw what it looked like under the microscope? • Describe the new evidence you could see under the microscope. • Materials that are homogeneous can be difficult to identify. Which heterogeneous liquid in this investigation did you think was homogeneous at first? Explain how you found out it was not. • What would you have to observe before you would be willing to call a material homogeneous?

  8. Milk OJ Pop microscope lens eyes microscope lens eyes microscope lens eyes

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