D1) Two drops of HCl and two drops of blue dye. A2) Two drops of blue dye and two drops of NaOCl. One drop of HCl was then added. F) Two drops of KI and two drops of Pb(NO3)2. G) Two drops of NaOH and two drops of phenolphthalein. H) Two drops of HCI and two drops of phenolphthalein. B2) Two drops of NaOH and two drops of AgNO3. C2) Two drops of AgNO3 and two drops of NH4OH. This mixture was then absorbed into the corner of a paper towel and held in direct sunlight for approximately 5 minutes
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Chemistry 101 Chapter 6 THERMOCHEMISTRY · Thermochemistry is the study of the quantity of heat energy released or absorbed in a chemical reaction. Example: the burning of fuel: is a heatevolving reaction · Heat : · Energy: is a form of energy the potential to do work (to move matter) exists in many different forms: Electrical energy Kinetic Energy (energy of motion) Light energy Heat energy Chemical energy (energy of substances) · Different forms of energy can be interconverted
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Within the author’s case‚ two graphs were plotted as one point was further out on the graph (see Figure 5). With Figure 5‚ the first three points were more aligned and showed a linear relationship‚ while the last point‚ which corresponded to 0.0262 M NaOH served as an outlier. The author decided to take out the last point and generated a new graph (see Figure 6)‚ which generated a more linear graph and resulted in a higher R2 of 0.9892. This caused a debate between what the reaction order was with respect
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activity and as you increase the pH the more oxygen that will be produced. Materials: 1. 5 clean test tubes 2. HCI (acid) 3. Dilute HCI 4. Water 5. NaOH (base) Procedure: We start to fill test tube 1 4drops of HCI (acid)‚ test tube 2 dilute HCI 1 drop and 3ml water‚ test tube 3 add 4 drops of NaOH (Base) ‚ test tube 4 dilute NaOH 1 drop and 3ml water‚ test tube 5 add 3 drops of water (neutral). We filled each tube with the “liver solution to see if there is any reaction in the different
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hydrogen ion will react with chromate to form an equilibrium and produce some dichromate and water. This reaction will cause the amount of chromate to decrease in order to form more products and the equilibrium will shift to the right. c) The NaOH‚ specifically the hydroxide‚ would react with the dichromate and push the equilibrium toward reactants. This would increase the amount of reactants and decrease the amount of dichromate being formed in the equilibrium. The solution would be yellow
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Abstract Qualitative analysis‚ a branch of analytical chemistry‚ deals with the identity of a substance found in a given sample‚ and not the amount of substance in it. It only concerns the substances present or absent in a given sample. Qualitative analysis is therefore used to determine unknown ions present in chemical samples by observing and analyzing results from various reactions of the sample with chemicals. Qualitative analysis is done through a series of steps. It is usually divided
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between each sample (Table 3.1). The diluted solutions of 1 M NaOH showed a few unexpected results. The original solution of 1 M NaOH was at a pH level of 11.50 (Table 3.1). However‚ the pH of sample B2 increased to 12.81 (Table 3.1). The remaining samples had a decreasing pH pattern for each dilution step (Table 3.1). Although the pH of B4 was less than the pH levels of B2 and B3‚ it was greater than the pH of full strength 1 M NaOH (Table 3.1). The unknown solutions B and F were in a lower pH range
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learned more about the molarity of aqueous solutions‚ and how that quantity‚ along with the volume of the solution‚ can be manipulated to find the exact number of moles in a given volume. In this case‚ experimenters were given aqueous solutions of NaOH and CaCl2 in known molarities and then had them react with one another to yield a precipitate of Ca(OH)2. The precipitate was filtered out of the remaining aqueous solution of stoichiometry. In our case‚ all four tests yielded more mass than should
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An Introduction to Water Analysis February 1 and February 8 2011 Aim and Objective: The aim of this experiment was to determine the pH level of an unknown HCl solution. While doing so‚ we would also be receiving a good and fundamental understanding of how to use modern lab equipment to determine the chemical and physical properties of water bodies. Method: Make sure safety gear is always on and equipment is always clean. Part 1- Direct Analysis by pH Test Kit We grab a 50ml beaker
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NO | ANSWER | MARK | 1 :( i )( ii ) ( iii ) ( iv )2 :( i )( ii )( iii )3 )4 )5 ) ( i )( ii )( iii )( iv )6 )7 ) i )ii ) iii )8 )9 )10 )i ) ii )iii)11 ) | A reagent is highly serves as a reference material in all volumetric & mass titrimetric method.A reagent solution of accurately known concentration. * End point-point at which the reaction is observed to be complete and there is permenant colour change at the end of titration. * Equivalent point-point at which an equivalent amount of
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