ࡱ> q` bjbjqPqP .d::$8$8$8$8,P8y6H99999[c[c[cxxxxxxx$Rzh|x"egb[c"e"ex99(xfff"eXl99xf"exffSsh|,t9<9 蔕$8ze@sux0ys<}e*<} t<}t[cvcTf%dDid[c[c[cxxf[c[c[cy"e"e"e"e"'' Solid Density Lab (Step 1) Problem: Which objects are less dense than water? In order to investigate this question you must answer What is the density of water? ____1______ g/mL (Step 2) Hypothesis: (Step 3) Procedures: Make some qualitative observations about each object then make a prediction about which objects are less dense than water. Find the objects mass using a triple beam balance scale. Find the objects volume using displacement. Calculate the density of each item. (Step 4) Qualitative Observations OBJECTOBSERVATIONSPREDICTION: less or more dense than waterBrass Cork Steel Lead Wood Aluminum Glass   (Step 4) Quantitative Observations OBJECTMASS (g)VOLUME (mL)DENSITY (g/mL)BrassCorkSteelLeadWoodAluminumGlass (Step 5) Conclusions: Using your calculations of density for the objects, which objects should be less dense than the water? The Cork and the wood ball Which objects should be denser than the water? The Brass, Steel, Lead, Aluminum, and Glass Balls Put each object into a beaker of water. Which objects actually floated? The Cork and the Wood balls Put each object into a beaker of water. Which objects actually sunk? The Brass, Steel, Lead, Aluminum, and Glass Balls Were your predictions correct? Why or why not? Whatever child predicted! Order the objects from less dense ( to water ( to most dense. Include the densities of the objects Liquid Density Lab Problem: How does the density of a liquid compare to the density of air masses when they meet at a front? Independent Variable: SHAPE \* MERGEFORMAT  Dependent Variable  SHAPE \* MERGEFORMAT  Hypothesis  Objective: You will be re-assessed on how to calculate the density of liquids. You will read the volume of a liquid in a graduated cylinder measuring in milliliters (mL) by reading the meniscus of the liquid. When most liquids are placed in a tall narrow container, they tend to creep up the walls of the container due to capillary action. The result is the liquid appears to be curved. The bottom of this curve is known as the meniscus, and it best represents the actual volume of liquid in the cylinder.  INCLUDEPICTURE "http://faculty.clintoncc.suny.edu/faculty/Michael.Gregory/files/bio%20101/Bio%20101%20Lectures/chemistry/meniscus.jpg" \* MERGEFORMATINET  Fig. 1  INCLUDEPICTURE "http://www.morrisonlabs.com/images/volumexamples/meniscus.gif" \* MERGEFORMATINET  Predict: Make a prediction. Predict how the liquid matter will appear when you mix all of the liquids together. Will they all be intermingled? Layered? If you predict layered please predict what will be on bottom? Top? Middle? Place in order from most dense to least dense. ___Childs prediction_______________________________________________________________________ Procedures: Find the mass of the graduated cylinder empty. Find the mass of the graduated cylinder and liquid matter. To calculate the mass of the liquid matter only, subtract the mass of the graduated cylinder empty from the mass of the graduated cylinder and the liquid matter. Record mass in the table. (Fig. 1) Find the volume of the liquid matter by reading the meniscus. Record data in the table. (Fig. 1) Calculate the density of the liquid matter by using the formula: Density= Mass/Volume Repeat steps 1-5 for every liquid. After you have determined the densities of all of the liquid matters, pour the liquids into the large graduated cylinder and determine if your results match your data and your predictions. Data will vary from group to group Liquid Mass (g)Volume (mL)Density g/mLWater with red dye Corn oil Corn Syrup Rubbing alcohol Pancake syrup  Analysis: Which liquids are less dense than water? ______________________________________________________________________________________________________________________________ Which liquids are denser than water? ______________________________________________________________________________________________________ Were your predictions correct? Why or Why not?_________________________ _______________________________________________________________________________________________________________________________________________________________________________________________________________ 4. Draw a density column in a graduated cylinder and arrange the liquids in the correct order from least dense liquid at the top and the densest liquid at the bottom.  SHAPE \* MERGEFORMAT  Explain how the density of a liquid is similar to the way air masses move when they meet. Be sure to explain what air masses have in common. (Where they came from and where they formed?) Remember an air mass has similar temperature and humidity. In your explanation be sure to describe which air is denser (warm or cold). Use the data to prove what a warm front will do when it meets a cold front. Then use your data to prove what a cold front would do when it meets a warm air mass.  SHAPE \* MERGEFORMAT  Draw a picture of how a cold air mass would move when it meets a warm air mass.  7. Draw a diagram of how a warm air mass would move if it met a cold air mass. 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