Lab: Flame Test Purpose: to determine the ID of 2 unknown substances Background Information: Every atom consists of a nucleus with tiny electrons whizzing around it. The further away from the nucleus they are‚ the more energy the electrons have. If a metal atom is heated‚ the electrons get enough energy to jump higher away from the nucleus‚ they become “excited”. When they fall back closer to the nucleus (back to their ground state)‚ they give off this extra energy as light. Why is the
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CHM113 summer 2014 Name: __________________________ EXAM 4 SHOW YOUR WORK 1) Of the molecules below‚ the bond in __________ is the least polar. A) HBr B) HI C) HCl D) HF E) H2 2) Ethanol (C2H5OH) melts at -114°C. The enthalpy of fusion is 5.02 kJ/mol. The heat capacity of solid and liquid ethanol are 0.97 J/g-K and 2.3 J/g-K‚ respectively. How much heat (kJ) is needed to convert 25.0 g of solid ethanol at -135°C to liquid ethanol at -50°C? A) 207.3 B) -12.7 C) 6.91 D) 4192 E)
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110 for 1 hour and cooled in a desiccator. Individual samples were weighed into each of three 250 mL Erlenmeyer flasks and dissolved in about 100 mL of distilled water. Small quantities of NaHCO3 was added until effervescence ceased. About 2 mL of K2CrO4 was introduced and the solution was titrated to the first
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Top of Form Bottom of Form Chemical Compound Formulas Chemistry is the study of the composition of matter and its transformation. A substance can be considered matter with definite properties that establishes its identity. The tremendous number of chemical compounds has been categorized into numerous categories. A broad classification distinguishes between inorganic and organic compounds. Organic compounds are carbon based. Inorganic compounds exclude compounds exclude compounds based on carbon
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CHAPTER 4 REACTIONS IN AQUEOUS SOLUTION MULTIPLE CHOICE QUESTIONS 4.1 Which of the following compounds is a strong electrolyte? E A. H2O B. O2 C. H2SO4 D. C6H12O6 (glucose) E. CH3COOH (acetic acid) Answer: C 4.2 Which of the following compounds is a strong electrolyte? E A. H2O B. N2 C. KOH D. C2H6O (ethanol) E. CH3COOH (acetic acid) Answer: C 4.3 Which of the following compounds is a weak electrolyte? E A. HCl B. CH3COOH (acetic acid)
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The chemical equation for this reaction is: CuSO4(aq) + BaCl2(aq) → BaSO4(s) + CuCl2(aq) Copper sulphate is harmful if swallowed and is also dangerous for the environment. It can be extremely toxic for aquatic organisms‚ so finding it in soil can be alarming‚ especially if it is in large quantities. I have
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Ratio of Mole of Reactants in a Chemical Reaction Purpose of Lab: To find the coefficients of two chemical reactants that appears in a balanced chemical equation using the continuous variations method. Pre Lab Questions: 1. 2AgNO3(aq) + K2CrO4(aq) → 2KNO3(aq) + Ag2CrO4(s) 2. There is enough to make a valid conclusion because‚ on the graph‚ one can clearly see that the two lines intersect. Thus‚ one can also determine the mole ratio. The mole ratio is approximately 2:1 (AgNO₃ to K₂Cr₄)
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Gerona‚ Evelyn Chemical Reactions Experiment No. 7 Date Performed: Feb. 17‚ 2014 Date Submitted: Feb. 24‚ 2014 Mrs. Vitancol I. Theoretical Framework A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. Classically‚ chemical reactions encompass changes that only involve the positions of electrons in the forming and breaking of chemical bonds between atoms‚ with no change to the nuclei (no change to the elements present)‚ and can often
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Lab Write Up Pre-Lab Questions: 1. What precipitation reaction could be used to separate and remove silver ions from a mixture containing iron (III) and zinc ions? A precipitation reaction that could be used is hydrochloric acid Ag+(aq) + HCl(aq) AgCl(s) +H+(aq) – white. 2. What precipitation reaction could be used to separate and remove iron (III) ions from the remaining mixture containing iron (III) and zinc ions? Fe3+(aq) + 3NaOH(aq) Fe(OH)3(s) + 3Na+(aq) 3. How can the presence of silver
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tubes One test tube rack Two test tube holders Two spatulas Three 250 mL beakers One stirring rod One medicine dropper Alcohol lamp or Busen burner Water bath One looped platinum or nichrome wire Label REAGENTS 0.5 M CaCl2 0.5 M BaCl2 M NaOH 0.1 M AgNO3 0.5 M KCl 0.5 M KBr 0.5 M KI 2 M NH4OH M KCN % H2O2 2 M H2SO4 MnO2 Saturated FeSO4 0.1 M NaNO3 CH3COOH 0.5 M Na2SO3 0.1 M KSCN 2 N KOH 0.5 M K4[Fe(CN)6] 0.5 M FeSO4 0.5 M FeCl3 0.5 M Al2(SO4)3 2 N HCl 0.5
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