Nuts and Bolts Purpose: The purpose of the lab is to correctly describe and distinguish samples and models of elements‚ compounds‚ and mixtures. The lab asks you to examine conceptual models of matter in which atoms of one element are represented by nuts while atoms of another element are represented by bolts. After examining each model‚ complete the following tasks: a. sketch a representative molecular picture of the model; b. describe the composition of the model in words (does
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experiment is to uncover whether or not the Expo Markers are homogeneous or heterogeneous mixtures. The experiment will conduct filter paper being slightly submerged in a container of water and inspected for pigmentation changes. In the experiment the pigments will rise up the filter paper once exposed to the water (solvent). After the experiment‚ it concludes that the mixture is a homogeneous mixture due to the chemical values equaling out with one another. Date:Tuesday‚ January 14‚
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matter is neither created or destroyed and it is only rearranged 2. In chemical reactions‚ the molecules stay the same‚ they are just rearranged to form a different substance Mixtures and Substances 1. A pure substance is a substance that consists of only one component and has a definite composition 2. A mixture is two substances that are mixed but not combined chemically 3. A pure substance has only one
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fill the container they are in‚ and have the ability to flow. ● Slide 6: What are the major differences in pure substances and mixtures? A pure substance always has the same composition and intensive (internal) properties (boiling point‚ density‚ freezing point‚ temperature). Since a pure substance has a fixed composition‚ you can write a formula for it. A mixture has a variable composition therefore there is not ONE formula for it. Slide 7 and 9: What are the differences in elements and compounds
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sugar‚ water‚ and food coloring were used which means that the sugar and food coloring were mixed in the water and looked like part of the water. This is also a “homogeneous mixture” because it appeared the same throughout (both on the visual level and particle level). The reason the sugar particles could not be seen in the mixture was because the sugar broke down and got smaller. Also the reason the food coloring looked lighter after the sugar was mixed in was because the particle spread apart more
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specific melting point‚ within one or two degrees Celsius. This is in opposition to a mixed‚ or contaminated substance‚ which will have a broad melting range. Therefore‚ when we mix our unknown with samples of phenacetin and acetanilide‚ whichever mixture has a more accurate melting point will tell us what our unknown is. It is also important to make sure that the resulting melting points are close to what the proven melting points of the substances are. Reaction Name of substance structure
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Efficacy of used plastics candles in making polishing agents La Salette of San Mateo San mateo‚ Isabela (name) Abstract Most of us spend about 90%of our time indoors‚ so minimizing the use of harmful chemicals in our homes‚ offices and schools is important to keep the air we breathe healthy and constructed surfaces we live on free of irritants and toxins. Besides being expensive‚ store-brought cleaners contain a number of chemicals. These chemicals can be hazardous to our health
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complete sentences‚ explain the purpose of this lab – what are you going to learn in this lab? (2 points) HYPOTHESIS: Answer the following in complete sentences: (2 points) 1. List one extensive and one intensive property of marker ink. 2. Define mixture. MATERIALS: coffee filter Tape rubbing alcohol water 3 different color magic markers (not permanent) 3 identical tall‚ narrow drinking glasses metric ruler 3 pencils PROCEDURE: 1. Cut 3 strips of coffee filter. Be sure that the strips are much
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2 or more elements‚ it is still considered a pure substance because while the elements bond so do the atoms. Therefore there is only one type of atom in the compound. Impure substance- Mixture: A substance that is made up of 2 or more different particles (Making it impure). There are 2 different types of mixture: Homogenous
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call walls. A 1:1 mixture of hexane and acetone was determined to best solvent for this extraction. Knowing this add one mL of the pure hexane and one mL of the pure acetone to the mortar. Grind the contents until the cell walls have been adequately broken. Transfer the mixture to a centrifuge tube to separate the sample into layers‚ to help remove the water. Once the sample is finished spinning extract the organic layer and place in a test tube. TLC: To determine which mixture acetone and hexane
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