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By Kay Winnit
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Remove the thermometer from the jar, and wrap the steel wool around the bulb of the thermometer. Secure the steel wool to the thermometer with a rubber band. 4. Place the thermometer and the steel wool inside the jar, and close the lid. Wait 5 min, and record the temperature. 2 Studying Matter and Energy SECTION 3 Measurements and Calculations in Chemistry ANALYSIS 1. How did the temperature change? 2. What do you think caused the temperature to change? 3. Do you think vinegar is a reactant or product?
One way of doing this is to use a conversion factor. A conversion factor is a simple ratio that relates two units that express a measurement of the same quantity. Conversion factors are formed by setting up a fraction that has equivalent amounts on top and bottom. 001 kg 1g SKILLS 1 Using Conversion Factors 1. Identify the quantity and unit given and the unit that you want to convert to. mass given 2. Using the equality that relates the two units, set up the conversion factor that cancels the given unit and leaves the unit that you want to convert to.
Compare the composition of sucrose puri- fied from sugar cane with the composition of sucrose purified from sugar beets. Explain your answer. 11. After a mixture of iron and sulfur are heated and then cooled, a magnet no longer attracts the iron. How would you classify the resulting material? Explain your answer. 12. How could you decide whether a ring was 24-karat gold or 14-karat gold without damaging the ring? 13. Imagine dissolving a spoonful of sugar in a glass of water. Is the sugar-water combination classified as a compound or a mixture?
All About Penguins by Kay Winnit