PowerPoint - Science Geek
... Stoichiometry “In solving a problem of this sort, the grand thing is to be able to reason backward. This is a very useful accomplishment, and a very easy one, but people do not practice it much.” Sherlock Holmes, in Sir Arthur Conan Doyle’s A Study in Scarlet ...
... Stoichiometry “In solving a problem of this sort, the grand thing is to be able to reason backward. This is a very useful accomplishment, and a very easy one, but people do not practice it much.” Sherlock Holmes, in Sir Arthur Conan Doyle’s A Study in Scarlet ...
Practice Test 2
... Vinegar contains a weak acid, acetic acid (HC2H3O2), which is responsible for its acidity. In one analysis of a commercial vinegar brand, a 15.0 mL sample was titrated with 0.4500 M NaOH. It required 30.50 mL of this NaOH solution to neutralize the acid in the vinegar sample. What is the molar conce ...
... Vinegar contains a weak acid, acetic acid (HC2H3O2), which is responsible for its acidity. In one analysis of a commercial vinegar brand, a 15.0 mL sample was titrated with 0.4500 M NaOH. It required 30.50 mL of this NaOH solution to neutralize the acid in the vinegar sample. What is the molar conce ...
Raman Spectroscopy
... • Uranyl sulphate acts as photosensitizer (i.e. absorbs the light and then passes it on to oxalic acid). The extent of reaction is measured by titrating the oxalic ...
... • Uranyl sulphate acts as photosensitizer (i.e. absorbs the light and then passes it on to oxalic acid). The extent of reaction is measured by titrating the oxalic ...
3. Chemical changes and Structure Unit Questions
... 15. Which of the following statements is true? A The potassium ion is larger than the potassium atom. B The chloride ion is smaller than the chlorine atom. C The sodium atom is larger than the sodium ion. D The oxygen atom is larger than the oxide ion. 16. Which of the following atoms has the least ...
... 15. Which of the following statements is true? A The potassium ion is larger than the potassium atom. B The chloride ion is smaller than the chlorine atom. C The sodium atom is larger than the sodium ion. D The oxygen atom is larger than the oxide ion. 16. Which of the following atoms has the least ...
Unit 6 Study Guide - Dorman High School
... C(g) + D(g). You have the gases A, B, C, and D at equilibrium. Upon adding gas A, the value of K A) increases because when A is added, more products are made, increasing the product-to-reactant ratio B) decreases because A is a reactant, so the product-toreactant ratio decreases C) does not change b ...
... C(g) + D(g). You have the gases A, B, C, and D at equilibrium. Upon adding gas A, the value of K A) increases because when A is added, more products are made, increasing the product-to-reactant ratio B) decreases because A is a reactant, so the product-toreactant ratio decreases C) does not change b ...
File
... NaOH is needed to titrate the sample to the equivalence point. What is the molar mass of the acid? A) 50.0 g B) 62.5 g C) 125 g D) 200 g E) 250 g 63. The pH of a solution prepared by adding 10.0 mL of 0.020 molar KOH (aq) to 10.0 mL of distilled water is closest to A) 13 B) 12 C) 11 D) 3 E) 2 64. Fa ...
... NaOH is needed to titrate the sample to the equivalence point. What is the molar mass of the acid? A) 50.0 g B) 62.5 g C) 125 g D) 200 g E) 250 g 63. The pH of a solution prepared by adding 10.0 mL of 0.020 molar KOH (aq) to 10.0 mL of distilled water is closest to A) 13 B) 12 C) 11 D) 3 E) 2 64. Fa ...
Conservation of Mass Lab
... during a chemical reaction. This means that all chemical reactions must be balanced—the number of atoms, moles, and ultimately the total mass must be conserved during a chemical process. Here are the rules to follow when balancing equations: ...
... during a chemical reaction. This means that all chemical reactions must be balanced—the number of atoms, moles, and ultimately the total mass must be conserved during a chemical process. Here are the rules to follow when balancing equations: ...
Mechanisms 3
... become a C-Cl bond. Products containing more than one halogen atom can be formed by further substitution on molecules that already contain a halogen atom. ...
... become a C-Cl bond. Products containing more than one halogen atom can be formed by further substitution on molecules that already contain a halogen atom. ...
Unit 1
... Students could perform lab experiments to predict which reaction they think would be faster. Using a potassium permanganate solution to react with different ions, such as Fe2+ or oxalate, students might demonstrate each and discuss the role the nature of reactants plays in the rates of reactions. St ...
... Students could perform lab experiments to predict which reaction they think would be faster. Using a potassium permanganate solution to react with different ions, such as Fe2+ or oxalate, students might demonstrate each and discuss the role the nature of reactants plays in the rates of reactions. St ...
Experiment 1
... A m____ of sand and table salt is given. The first step is to d____ the salt by adding suitable amount of w____. The sand is dissolved in w____ to form a salt s____ while the sand is not soluble (i______) in water and stay at the bottom of the beaker. ...
... A m____ of sand and table salt is given. The first step is to d____ the salt by adding suitable amount of w____. The sand is dissolved in w____ to form a salt s____ while the sand is not soluble (i______) in water and stay at the bottom of the beaker. ...
Things to Know to Pass the Chemistry Regents
... 123. Catalysts increase rate of reaction by lowering activation energy (alternate pathway) 124. Increased pressure when gases present increases rate of reaction 125. Interpret potential energy diagrams *PE of reactants *PE of products *Activation energy (and show effect of a catalyst) *Activated com ...
... 123. Catalysts increase rate of reaction by lowering activation energy (alternate pathway) 124. Increased pressure when gases present increases rate of reaction 125. Interpret potential energy diagrams *PE of reactants *PE of products *Activation energy (and show effect of a catalyst) *Activated com ...
111 Exam I Outline
... IV. LIMITING REACTANTS When most reactions are performed, some of the reactants is usually present in excess of the amount needed. If the reaction goes to completion, then some of this excess reactant will be left-over. The limiting reactant is the reactant used-up completely and it "limits" the re ...
... IV. LIMITING REACTANTS When most reactions are performed, some of the reactants is usually present in excess of the amount needed. If the reaction goes to completion, then some of this excess reactant will be left-over. The limiting reactant is the reactant used-up completely and it "limits" the re ...
Enzymes: “Helper” Protein molecules
... Enzymes aren’t used up Enzymes are not changed by the reaction used only temporarily re-used again for the same reaction with other molecules very little enzyme needed to help in many reactions ...
... Enzymes aren’t used up Enzymes are not changed by the reaction used only temporarily re-used again for the same reaction with other molecules very little enzyme needed to help in many reactions ...
Thermo notes Part II
... Ex. gas burning. Δ G is + (pos), the rxn won’t go on it’s own, wants to stay as reactants. Ex. batter cake ...
... Ex. gas burning. Δ G is + (pos), the rxn won’t go on it’s own, wants to stay as reactants. Ex. batter cake ...
Transition state theory
Transition state theory (TST) explains the reaction rates of elementary chemical reactions. The theory assumes a special type of chemical equilibrium (quasi-equilibrium) between reactants and activated transition state complexes.TST is used primarily to understand qualitatively how chemical reactions take place. TST has been less successful in its original goal of calculating absolute reaction rate constants because the calculation of absolute reaction rates requires precise knowledge of potential energy surfaces, but it has been successful in calculating the standard enthalpy of activation (Δ‡Hɵ), the standard entropy of activation (Δ‡Sɵ), and the standard Gibbs energy of activation (Δ‡Gɵ) for a particular reaction if its rate constant has been experimentally determined. (The ‡ notation refers to the value of interest at the transition state.)This theory was developed simultaneously in 1935 by Henry Eyring, then at Princeton University, and by Meredith Gwynne Evans and Michael Polanyi of the University of Manchester. TST is also referred to as ""activated-complex theory,"" ""absolute-rate theory,"" and ""theory of absolute reaction rates.""Before the development of TST, the Arrhenius rate law was widely used to determine energies for the reaction barrier. The Arrhenius equation derives from empirical observations and ignores any mechanistic considerations, such as whether one or more reactive intermediates are involved in the conversion of a reactant to a product. Therefore, further development was necessary to understand the two parameters associated with this law, the pre-exponential factor (A) and the activation energy (Ea). TST, which led to the Eyring equation, successfully addresses these two issues; however, 46 years elapsed between the publication of the Arrhenius rate law, in 1889, and the Eyring equation derived from TST, in 1935. During that period, many scientists and researchers contributed significantly to the development of the theory.