all of the data recorded from the lab‚ with the exception of number 13‚ agreed with the predictions made beforehand. 2. Out of the 15 combinations‚ the observations made for the combination of number 13 (the reaction of lead (II) nitrate and barium chloride)‚ did not agree with what was predicted‚ based on the solubility rules. The solubility rules that were used to make this prediction were rules number 2 and 3. Rule number 2 states that all salts containing nitrate‚ acetate and perchlorate
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H2SO4 MgSO4 + H2O ->Mg (OH)2 + H2SO4 Barium Sulfate: No reaction Step 13: MgCl2 + Na2CO3 -> MgCO3 + 2NaCl CaCl2 + Na2CO3 -> CaCO3 + 2NaCl BaCl2 + Na2CO3 -> BaCO3 + 2NaCl 2. The reactivity of the metal increases with each period it goes down. Magnesium is the least reactive and is in the third period with an atomic number of 12. Calcium is slightly more reactive being in the fourth period and having an atomic number of 20. Barium is the most reactive because it is in the sixth
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EXPERIMENT # 14: Exothermic and endothermic reactions Date: 25/06/2012 Name: Meagen Reyes Year 11 PARTS A‚ B and C * For the procedures and equipment needed in these experiments‚ refer to page 73-74 in the STAWA Exploring chemistry stage 2 book Part A: solution process (dissociation) Solutions and their chemical equations | Initial temperature (in Celsius) | Final temperature (in Celsius) | Classification(exothermic or endothermic) | Sodium hydroxide NaOH(s) Na+(aq) + OH-(aq) + Energy
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fashion and made a chart in my lab notebook to facilitate my observation documentation. In the 96-well plate‚ I placed two drops of cobalt II nitrate into seven wells in one row‚ copper II nitrate into another row‚ iron III nitrate into a third row‚ barium nitrate into a fourth row‚ and nickel II nitrate into a fifth row. Then I added 2 drops of sodium phosphate into each of the wells containing the chemicals and documented to reactions. I repeated this procedure of adding 2 drops into each row of
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Magnesium powder Spatula Universal Indicator Thermal mat Filter paper Safety: Wear eye protection. Magnesium and calcium are highly flammable. Calcium hydroxide is an irritant. Group 2 elements Calcium Strontium Magnesium Beryllium Barium Radium Introduction: The Group 2 elements are all metals with a shiny‚ silvery-white colour having 2 electrons in their outermost shell. The alkaline earth metals are high in the reactivity series of metals‚ but not as high as the alkali
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EXPERIMENT 1 IDENTIFICATION OF UNKNOWN COMPOUNDS Date of experiment : 7th August 2012 Venue: ME204 INTRODUCTION Chemical reactions are regularly categorized into 3 types: oxidation-reduction (redox reaction)‚ precipitation (double displacement) and acid-base reaction (double displacement) Type 1: Oxidation-Reduction Reactions Oxidation-reduction processes include the movements of electrons form oxidants to reductants‚ which lead to increases in oxidation
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P3– a. gain of 1 electron b. loss of 1 electron c. gain of 3 electrons d. loss of 2 electrons e. loss of 2 electrons f. loss of 1 electron g. gain of 1 electron h. loss of 2 electrons a. bromide anion b. sodium cation c. arsenide anion d. barium cation e. calcium cation f. copper(I) cation g. hydride anion h. copper(II) cation S OBLE M ASSESSMENT 27. an electron in the highest occupied energy level 28. a. Group 5A; 5 valence electrons E LESSON 7.1 PR Answers
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3. Observations (12 pts); The color of the flame is expected to be as follows: Metallic ion Flame Color Sodium Na+ Orange Strontium Sr2+ Pinkish-red Potassium K+ Bluish-purple Lead Pb2+ NOT IN LABPAQ Barium Ba2+ Yellow Copper Cu2+ Green Lithium Li+ Pink Calcium Ca2+ Orangish-pink Unknown Pinkish-red STRONTIUM Note: Attach your picture showing the soaked cotton swab back and forth through the flame of the heat source (procedure #4)
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THE CLASSIFICATION OF CHEMICAL REACTIONS Danny Bhatt SCH3U0-G Mr. Gandhi Wednesday‚ April 1st‚ 2014 INTRODUCTION The purpose of this lab is to determine the different types of chemical reactions and differentiate between them based on similar characteristics of each set category. In this lab it is hypothesized that every chemical reaction which was observed would fall under already set categories (that are: synthesis‚ decomposition‚ single displacement‚ double displacement‚ combustion and
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lower level which makes the color back to normal. In order to determine the identity of several unknowns‚ I will perform flame tests and then use my data and observations. Background In this Unit‚ I am studying the election configurations such as Barium‚ Copper‚ Lithium‚ Potassium‚ and ects. I studied wavelengths in the visible spectrum. I also studied a characteristic color in a flame test and energy changes of electrons. Procedure 1. Put on lab apron. 2. A half amount of water was added to
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