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Name: _____________________ Per: ___ Lab: Cornstarch and Water Question: Which state of matter will be produced when cornstarch and water are mixed together? Background Knowledge: Fill in the blanks. Cornstarch is a white powder (solid) and water is a liquid. What makes a substance a solid, liquid, or gas has to do with what the particles are like. Particles in a solid are ______________________. They ________in place and the attractive force between them is very________. This is why solids have a fixed _________and fixed ________. Similarly, particles in a liquid stay close together. This is why the volume (the space an object takes up) is ___________ for a liquid. Yet, the particles in a liquid can ___________________ because the attractive force between the particles is ___________ than that of a solid. This is why liquids do not have a fixed _________. A suspension is a kind of mixture in which particles are unevenly distributed (or spread out). Amorphous solids: An amorphous solid is a solid in which there is no long-range order or repeating pattern in the positions of its particles. Most classes of solid materials can be found or prepared in an amorphous form. Examples of amorphous solids include window glass, many polymers (which are long strings of particles, such as cornstarch), and even foods such as cotton candy. For more background knowledge, go to: http://entertainment.howstuffworks.com/play-doh.htm/printable Hypothesis: A mixture of cornstarch and water will most likely produce a _____________ (solid or liquid) because __________________________________________________________________ ______________________________________________________________________________ Procedure: Mix 25 grams of cornstarch with 20 ml of liquid water. If mixture is too “watery,” add small amounts of cornstarch until its consistency is like that of pancake batter. Then, roll the mixture in your hands. Use your finger to press down hardly on the mixture. Use the spoon or your finger to slap the surface of your mixture. Data/Observations: In at least 3 complete sentences, describe the mixture of cornstarch and water: ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ Conclusion: Based on the observations collected, the cornstarch and water mixture is a _____________________. It is a ____________________________ because ______________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________