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2 Science Strand A Density & Volume Benchmark SC. A The student determines that the properties of materials (e.g., density and volume) can be compared and measured (e.g., using rulers, balances, and thermometers). Task: Students will determine the density of a variety of objects. Materials: Triple beam balance Variety of objects (paper clips, coins, rocks, marbles, cork, blocks of wood, plastic lid, pens, rubber stopper) One gallon plastic container or small plastic terrarium/aquarium Enough water to fill one half of the aquarium Pencil Data Sheet Procedure: 1. Create a chart with four columns. Label the 1 st column Objects, the 2 nd column Weight, the 3 rd column Prediction and the 4 th column Actual. 2. List the items in this center in the first column of your chart. 3. Weigh each object on the list and record the weight in the 2 nd column next to the object. 4. Predict which ones will float and sink. Write the letter F for float and S for sink in the 3 rd column next to each object. 5. Place each object one at a time in the container of water. 6. Record if the object floated or sank next to each object in the 4 th column of your chart. How well did you do? 7. Write a conclusion. Grade 4 Science Centers page 2

3 Density & Volume Assessment Benchmark SC.A Circle the correct answer. 1. Why do some objects float in water? A. Some objects are less dense than the volume water in which they are placed. B. The weight of an object determines if it will float. C. Some objects are denser than the volume of water in which they are placed. D. The size of an object determines if it will float. 2. The density of an object depends on which of the following? A. mass and weight B. mass and volume C. volume D. weight Write what you learned by doing this experiment in your science journal. Grade 4 Science Centers page 3

4 Science Strand A Changes in the States of Matter Benchmark SC.A The student knows that common materials (e.g., water) can be changed from one state to another by heating and cooling. Task: How long can you keep an ice cube from melting? Materials: One ice cube per student (may be kept in a cooler in the classroom or in a thermos) packing material (peanuts, bubble wrap, aluminum foil, newspaper, etc.) tape Procedure: 1. Select materials that you think will keep your ice cube from melting. 2. Predict how long this material will keep ice from melting. Record your prediction. 3. Wrap your ice cube in the material you selected. 4. Time how long it took for the ice cube to melt. 5. Record the time. How did the actual melting time compare with the time in your prediction? 6. Compare your results with others in your class. 7. Write a conclusion. Grade 4 Science Centers page 4

5 Changes in States of Matter Assessment Benchmark SC.A Circle the correct answer. 1. Melting is the changing of a solid to a liquid. When does melting occur? A. when a substance loses heat energy B. when a substance absorbs heat energy C. when a substance becomes more dense D. when a substance loses mechanical energy 2. Freezing is the changing of a liquid to a solid. When does freezing occur? A. when a substance loses heat energy B. when a substance absorbs heat energy C. when a substances becomes less dense D. when a substances loses mechanical energy Think about all the things that people use to keep soft drinks cold when there is no refrigeration. What do you use to keep a soft drink cold? Explain how it works to keep the drink cold. Grade 4 Science Centers page 5

6 Science Strand A Physical Changes Benchmark SC. A The student knows that different materials are made by physically combining substances and that different objects can be made by combining different materials. Task: How can you physically change paper? Materials: Paper Pencil Procedure: 1. Make a list of how many ways you can physically change a sheet of paper. 2. Take one sheet of paper and physically change it in at least three ways. Grade 4 Science Centers page 6

7 Physical Changes Assessment Benchmark SC.A Circle the correct answer. 1. Which of the following describes a physical change? A. A change in the appearance of the object but not the properties. B. A change in the properties of the object but not the appearance. C. The appearance and the properties do not change. D. The properties change and something new is formed. 2. Which of the following is a physical change? A. burning paper B. mixing baking soda and vinegar C. adding warm water to yeast D. crumpling paper Define and explain a physical change? Write the answer in your science journal. Grade 4 Science Centers page 7

8 Science Strand A Chemical Change Benchmark SC.A The student knows that materials made by chemically combining two or more substances may have properties that differ from the original materials. Task: Understand the characteristics of a chemical change. Materials: One 5oz. paper cup per one or two students One teaspoon of baking soda Two teaspoons of vinegar goggles Procedure: 1. Observe the baking soda. Write a description of its properties. 2. Observe the vinegar. Write a description of its properties in your science journal. 3. Put on the goggles 4. Pour two teaspoons of vinegar into a cup 5. Slowly add 1 teaspoon of baking soda Observe the reaction. Write a description of the change that occurred in your science journal. Grade 4 Science Centers page 8

9 Chemical Change Assessment Benchmark SC.A Circle the correct answer. 1. Which of the following describes a chemical change? A. When a chemical change occurs only the appearance of the substance changes. B. When a chemical change occurs only the properties of the substance changes. C. When a chemical change occurs a new substance is formed. D. When water is added to flour a chemical change occurs. 2. What is the difference between a chemical and a physical change? A. A chemical and a physical change are the same. B. A chemical and a physical change create new substances. C. A chemical change does not create a new substance but a physical change does. D. A chemical change creates a new substance and a physical change does not. 3. Give three examples of chemical changes that occur daily. Write what you learned about chemical changes in your science journal. Grade 4 Science Centers page 9

11 Magnification Assessment Benchmark SC.A Circle the correct answer. 1. What best explains what happens to objects when placed under a microscope? A. Some small objects look bigger. B. Some small objects look smaller. C. Things that you could not see with your eyes are invisible. D. Things that you could not see with your eyes are visible. 2. John bought a bag of potting soil. What might he observe when the soil is magnified? A. plastic B. yarn C. crystals D. paper Write a conclusion about this experiment in your science journal. Grade 4 Science Centers page 11

12 Answer Key 4 th Grade Science Centers Strand A- Nature of Matter Volume and Density (SC.A ) 1. A 2. B Changes in the States of Matter (SC.A ) 1. B 2. A Physical Changes (SC.A ) 1. A 2. D Chemical Changes (SC.A ) 1. C 2. D Magnification (SC.A ) 1. D 2. C Grade 4 Science Centers page 12

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