Basic Stoichiometry PhET Lab Let’s make some sandviches! Introduction: When we bake/cook something‚ we use a specific amount of each ingredient. Imagine if you made a batch of cookies and used way too many eggs‚ or not enough sugar. YUCK! In chemistry‚ reactions proceed with very specific recipes. The study of these recipes is stoichiometry. When the reactants are present in the correct amounts‚ the reaction will produce products. What happens if there are more or less of some of the reactants
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t-Pentyl Chloride is a compound that is created through an SN1 nucleophilic substitution reaction in addition with Hydrogen Chloride in order to isolate the product. A variety of procedural techniques were utilized during the experiment including extraction‚ washing liquids‚ drying liquids‚ gravity filtration‚ and simple distillation. When a single solute or compound is transferred between two different solutes‚ it is known as extraction. Another technique that was utilized was washing‚ in which
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are two ordinary examples which require very little description. Just a little more involved are the displacement reactions‚ with which this exercise is mainly concerned. Your text book divides these processes into three categories: • • • hydrogen displacement metal displacement halogen displacement You may remember (?) how to tell if a chemical reaction is occurring by looking at the behavior of a combination of chemicals‚ but can you predict whether or not a reaction like those above
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1. On analysis‚ a compound with molar mass 60 g mol–1 was found to contain 12 g of carbon‚ 2 g of hydrogen‚ and 16 g of oxygen. What is the molecular formula of the compound? A. CH2O B. CH4O C. C2H4O D. C2H4O2 2. What is the total number of atoms in 0.20 mol of propanone‚ CH3COCH3? a. 1.2×1022 b. 6.0×102 C. 1.2×1024 D. 6.0×1024 Assuming complete reaction‚ what volume of 0.200 mol dm–3 potassium hydroxide solution (KOH(aq))‚ is required to neutralize 25.0 cm3 of 0.200 mol dm–3 aqueous
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with that atom in a compound. An element’s electronegativity value and other properties affect its oxidation state in different compounds. Decomposition: Some compounds decompose into more than one different element or compound as bonds are broken. Hydrogen peroxide (H2O2)‚ a chemical you may have around your house‚ is stored in a dark container to slow down decomposition‚ which can be caused by heat and light. clues that can indicate that a chemical change has occurred include: production of flames
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Periodic Table Trends: Atomic Radius - half of the distance between the centers of two atoms that are touching each other decreases moving left to right increases moving top to bottom Ionization Energy - energy required to remove an electron increases moving left to right decreases moving top to bottom Electron Affinity - ability to accept an electron alkaline earth elements have low electron affinities halogens have high electron affinities noble gases have electron affinities near zero
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(3) Answer the questions related to each chemical formula. O2 CO2 5 H2 What element does the O represent? ___________________ How many atoms of each element are in the formula shown? C = ______ O = ______ How many atoms of Hydrogen are in this formula as shown? ______ 2C2H6 2Na2SO4 How many atoms each element are in the formula shown? C = ______ H = ______ How many atoms each element are in the formula shown? Na = ______ S = ______ O = ______ Part B: Label
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Chemical Reactions & Equations CHEMICAL REACTION : In a reaction when the original state of the particle changes and it cannot be reversed by simple physical means‚ this type of reaction is known as chemical reaction. Example :- Fermentation of grapes‚ burning of wood etc. In this reaction we have seen that after burning of wood‚ coal is formed and we cannot make wood from coal. PHYSICAL REACTION : In a reaction when original state of the particle can be recovered by any means then this type of
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it must be presumed to be a binary one‚ unless some cause appear to the contrary".. Dalton proceeded to print his first published table of relative atomic weights. Six elements appear in this table‚ namely hydrogen‚ oxygen‚ nitrogen‚ carbon‚ sulfur‚ and phosphorus‚ with the atom of hydrogen conventionally assumed to weigh 1. He hypothesized the structure of compounds can be represented in whole number ratios. So‚ one atom of element X combining with one atom of element Y is a binary compound. Furthermore
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lot of single carbon bonds. This makes them much straighter in shape and therefore easier to stack together. It’s called “saturated” fat because the molecule has the maximum amount of hydrogen atoms attached to it as possible. Unsaturated fat has double carbon bonds. Each double carbon bond means two less hydrogen atoms on the molecule. Unsaturated fat also is kinked at each double bond‚ disrupting the straight shape. These kinks get in the way of the molecules packing together tightly. This is why
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