enthalpy of reaction
... Consider the following reaction: 2 H2 (g) + O2 (g) 2 H2O (g) If Hrxn < 0, it means: A) The products have less energy than the reactants – you could make a hot pack. B) The reactants have less energy than the products – you could make a cold pack. C) The products have less energy than the reactan ...
... Consider the following reaction: 2 H2 (g) + O2 (g) 2 H2O (g) If Hrxn < 0, it means: A) The products have less energy than the reactants – you could make a hot pack. B) The reactants have less energy than the products – you could make a cold pack. C) The products have less energy than the reactan ...
Chemical Formulas and their arithmetic
... Several related terms are used to express the mass of one mole of a substance. Molecular weight This is analogous to atomic weight: it is the relative weight of one formula unit of the compound, based on the carbon12 scale. The molecular weight is found by adding atomic weights of all the atoms pre ...
... Several related terms are used to express the mass of one mole of a substance. Molecular weight This is analogous to atomic weight: it is the relative weight of one formula unit of the compound, based on the carbon12 scale. The molecular weight is found by adding atomic weights of all the atoms pre ...
Chemical Equilibrium
... The concentration of solids and pure liquids are not included in the expression for the equilibrium constant. PCO 2 does not depend on the amount of CaCO3 or CaO ...
... The concentration of solids and pure liquids are not included in the expression for the equilibrium constant. PCO 2 does not depend on the amount of CaCO3 or CaO ...
Chemistry Log Books - Social Circle City Schools
... (b) How many moles of CaCl2 contain 1.26x1024 formula units of CaCl2? (Tech can omit) (c) Determine the number of moles of arsenic in 1.90 g As. (d) Calculate the mass in grams of 42.5 mol of potassium cyanide (KCN). (e) Determine the mass in grams of 5.65 x 1024 atoms Se. (Tech can omit) 4. What is ...
... (b) How many moles of CaCl2 contain 1.26x1024 formula units of CaCl2? (Tech can omit) (c) Determine the number of moles of arsenic in 1.90 g As. (d) Calculate the mass in grams of 42.5 mol of potassium cyanide (KCN). (e) Determine the mass in grams of 5.65 x 1024 atoms Se. (Tech can omit) 4. What is ...
Chemistry II Exams and Keys 2013 Season
... KMnO4 solution. The concentration of the permanganate solution is standardized using dried sodium oxalate. The titration of 5.00 mL aliquot of peroxide solution requires 24.07 mL of 0.01905 M permanganate solution. What is the percent concentration by mass of the peroxide solution if the density is ...
... KMnO4 solution. The concentration of the permanganate solution is standardized using dried sodium oxalate. The titration of 5.00 mL aliquot of peroxide solution requires 24.07 mL of 0.01905 M permanganate solution. What is the percent concentration by mass of the peroxide solution if the density is ...
File
... H2O produced when a given quantity of the alcohol is combusted. We must determine the empirical formula for isopropyl alcohol, a task that requires us to calculate the number of moles of C, H, and O in the sample. Plan We can use the mole concept to calculate grams of C in the CO2 and grams of H in ...
... H2O produced when a given quantity of the alcohol is combusted. We must determine the empirical formula for isopropyl alcohol, a task that requires us to calculate the number of moles of C, H, and O in the sample. Plan We can use the mole concept to calculate grams of C in the CO2 and grams of H in ...
Oxidation-reduction reaction of chromium (VI) and iron (III) with
... rates were monitored at these wavelengths by noting the decrease in absorbance of the reaction mixture with time in each case. All kinetic measurements were made under pseudo-first order conditions with the concentration of paracetamol at least 60 times greater than that of the [Cr (VI)] and [Fe (II ...
... rates were monitored at these wavelengths by noting the decrease in absorbance of the reaction mixture with time in each case. All kinetic measurements were made under pseudo-first order conditions with the concentration of paracetamol at least 60 times greater than that of the [Cr (VI)] and [Fe (II ...
Empirical Formula
... smallest number that you can multiply by all the mol amounts you have just calculated to get them to be all whole numbers or within .1 of a whole number. ...
... smallest number that you can multiply by all the mol amounts you have just calculated to get them to be all whole numbers or within .1 of a whole number. ...
Stoichiometry: Calculations with Chemical Formulas and Equations
... Calculating Empirical Formulas The compound para-aminobenzoic acid (PABA) is composed of carbon (61.31%), hydrogen (5.14%), nitrogen (10.21%), and oxygen (23.33%). Find the empirical formula of PABA. ...
... Calculating Empirical Formulas The compound para-aminobenzoic acid (PABA) is composed of carbon (61.31%), hydrogen (5.14%), nitrogen (10.21%), and oxygen (23.33%). Find the empirical formula of PABA. ...
File - Mr Weng`s IB Chemistry
... • The mole is a fixed number of particles and refers to the amount, n, of substance. • Masses of atoms are compared on a scale relative to 12C and are expressed as relative atomic mass (Ar) and relative formula/molecular mass (Mr). • Molar mass (M) has the units g mol-1. • The empirical formula and ...
... • The mole is a fixed number of particles and refers to the amount, n, of substance. • Masses of atoms are compared on a scale relative to 12C and are expressed as relative atomic mass (Ar) and relative formula/molecular mass (Mr). • Molar mass (M) has the units g mol-1. • The empirical formula and ...
Unit 13, Lesson 1
... chloride, bromide, and iodide ions in solution. In fact, molecular fluorine is so reactive that it also attacks water; thus these reactions cannot be carried out in aqueous solutions. On the other hand, molecular chlorine can displace bromide and iodide ions in aqueous solution. Cl2(g) + 2KBr(aq) ...
... chloride, bromide, and iodide ions in solution. In fact, molecular fluorine is so reactive that it also attacks water; thus these reactions cannot be carried out in aqueous solutions. On the other hand, molecular chlorine can displace bromide and iodide ions in aqueous solution. Cl2(g) + 2KBr(aq) ...
Collision Theory
... We want to provide at least a qualitative understanding of why the rate law takes this form. We will first develop the collision rate, using collision theory for hard spheres of ...
... We want to provide at least a qualitative understanding of why the rate law takes this form. We will first develop the collision rate, using collision theory for hard spheres of ...
Stoichiometry - MolesAvacado
... Students often have misconceptions about chemical reactions and stoichiometry. In talking to an experienced chemistry teacher, I found that a common misconception is that substances always react in a 1:1 ratio. I can remember that this is a misconception I had early in my chemistry career. Along the ...
... Students often have misconceptions about chemical reactions and stoichiometry. In talking to an experienced chemistry teacher, I found that a common misconception is that substances always react in a 1:1 ratio. I can remember that this is a misconception I had early in my chemistry career. Along the ...
chemistry intermediate may 2010 marking scheme
... (i) Explain why this reaction is called addition polymerization. ...
... (i) Explain why this reaction is called addition polymerization. ...
Raman Spectroscopy
... • If Einstein's law is correct, every reacting molecule will absorb one quantum of radiation. Hence the number of reacting molecules should be equal to the number of quanta absorbed. However, it is found that in a number of cases, a small amount of the light absorbed can bring about a large amount o ...
... • If Einstein's law is correct, every reacting molecule will absorb one quantum of radiation. Hence the number of reacting molecules should be equal to the number of quanta absorbed. However, it is found that in a number of cases, a small amount of the light absorbed can bring about a large amount o ...