Submitted: June 10‚ 2015 Title: Observations of Chemical and Physical Changes Purpose: the purpose of this lab experiment is that I will be able to decipher the difference between a chemical and physical change. I will be about to tell whether a chemical change has occurred during the experiment or if it was a physical change and I will be able to answer why it is either one. Procedure: In the lab experiment‚ I mixed different types of chemicals with different background to see if there was a chemical
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Courtney Cubine 6/19/13 June 20‚ 2013 Separation of a Mixture of Solids Purpose: The purpose of this experiment was to help the student learn how to separate a mixture of multiple different solids and determine the percentage of each component of the mixture. Procedure: I started off by removing the iron using the magnet‚ and then I weighed all of the iron I obtained from the mixture in a container I already knew the weight of and calculated the net weight of the iron. Next
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Magnesium‚ an abundant mineral in the body‚ is naturally present in many foods‚ added to other food products‚ available as a dietary supplement‚ and present in some medicines (such as antacids and laxatives). Magnesium is a cofactor in more than 300 enzyme systems that regulate diverse biochemical reactions in the body‚ including protein synthesis‚ muscle and nerve function‚ blood glucose control‚ and blood pressure regulation [1-3]. Magnesium is required for energy production‚ oxidative phosphorylation
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Chem 31.1 Post Lab 3 CARBONYL COMPOUNDS AND CARBOHYDRATES HYDROLYSIS OF POLYSACCHARIDES - - Susceptible to both nucleophiles and electrophiles Presence of C=O TEST FOR ALDEHYDES AND KETONES - - Reaction with 2‚4-DNP (Dinitrophenylhydrazine) Positive: Formation of yellow precipitate IODOFORM TEST - Carbonyl compounds: Methyl ketones will give a positive result Postive: Yellow precipitate (CHI3) MOLISCH’S TEST for carbohydrates - TOLLEN’S TEST – for aldehydes
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and then became a rusty brown color later‚ after stirring. After heating solution‚ it produced bubbles‚ showing us the process of oxidization in reaction‚ and the color of the solution became dark brown. After stirring solution‚ allowing it to heat until boiling‚ and adding 8 mL of 1 M H2C2O4 (first 5 mL at once‚ the next 3 mL slowly)‚ the solution
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Give brief answers to the following questions : 1. What happens to a molecule when it absorbs UV light ? rvv’ill occra’’ 6e cfr’oh fvhan ?- rr.ote c ulQ a$c‚ovb r4V t;g hl ‚ ?*rltdfi’oh o{ olQelraq ofc pronrottd potn *h’Qhr lraur1 dt *q‚fe to erc;feC‚ slst<‚Th<;6bSotb1 ) qh’:o&s ih n^olf c’‚la g r.in9 qb‚olal ob{‚1tr.ira :Lind c o1 et<cif l‚pln+t qt"d QqCh W-qrtr\ve 1t5 ou‚ 4iSfictlre ancvcry.0rl+yorvi6lst: qnI vrstblC t;Jht brin3 lboql rrrovc tbq\i v orl{rrro e.tCclro tts t5 Ricorlt5 fu o rv
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Investigating the Determining Characteristics of Cations and Anions Chem 111 Sec 560 Introduction: The purpose of this lab was to study the specific characteristics of cations and anions‚ and ultimately to be able to identify an unknown substance based on our studies and tests using the logic trees developed through the experiment. A logic tree is a graphical display of the findings from this lab which‚ through a series of yes/no questions‚ elimination tests
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Majed Al Dhwaihi Chem 151 Lab Prelab Assignment for week 3 Chemical Separation Procedure: Separating the sample: First place a small amount of the spinach provided in the mortar‚ just enough to cover its bottom; combined with the sand provided to break down the 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
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Aim: to perform a firsthand investigation to compare the physical and chemical properties of magnesium and oxygen when they are experimented to form magnesium oxide Theory: The empirical formula of a compound is the formula that tells us the ratio in which the atoms are present in the compound. To calculate an empirical formula: - Write down the masses of all of the elements present - Convert masses to moles (by dividing by atomic weights in grams) - Divide through by the smallest number of
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Patel Chem 101 10-13-09 Introduction The objective of this lab was to show how stoichiometry is applied to a specific chemical reaction. Stoichiometry is pretty much the math behind chemistry. Doing stoichiometry can calculate masses‚ moles‚ and percents with a chemical equation. The use of stoichiometry is how we were able to find the limiting reagent in this lab. A limiting reagent is the chemical that will be used up first. Many calculations had to be made throughout this lab. Some
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