Thermochemistry - University of Missouri
... The physical states of all reactants and products must be specified in thermochemical equations. H2O (s) ...
... The physical states of all reactants and products must be specified in thermochemical equations. H2O (s) ...
Topic 1: Quantitative chemistry
... 2. Law of Definite Proportions: analytical tests showed that any compound consists of the same elements in definite proportions e.g. in every water molecule 88.88% of its mass is oxygen. 3. Law of Combining Volumes of Gases: Gay-Lussac (1803) concluded that when gases react they do so in whole numbe ...
... 2. Law of Definite Proportions: analytical tests showed that any compound consists of the same elements in definite proportions e.g. in every water molecule 88.88% of its mass is oxygen. 3. Law of Combining Volumes of Gases: Gay-Lussac (1803) concluded that when gases react they do so in whole numbe ...
CHEM 30 REDOX
... charge between specified points. Electric potential differences are measured in volts . Standard conditions: – At 25oC with all ions at 1 mol/L ...
... charge between specified points. Electric potential differences are measured in volts . Standard conditions: – At 25oC with all ions at 1 mol/L ...
Document
... The physical states of all reactants and products must be specified in thermochemical equations. H2O (s) ...
... The physical states of all reactants and products must be specified in thermochemical equations. H2O (s) ...
AP Chemistry Name: Ch.2 – The Nuclear Atom Date: Period:
... 3. Write balanced chemical equations for the following reactions: a. the decomposition of ammonium nitrate to nitrogen gas, oxygen gas, and water vapor. b. the reaction of sodium bicarbonate with sulfuric acid to produce sodium sulfate, water, and carbon dioxide. c. the treatment of phosphorus penta ...
... 3. Write balanced chemical equations for the following reactions: a. the decomposition of ammonium nitrate to nitrogen gas, oxygen gas, and water vapor. b. the reaction of sodium bicarbonate with sulfuric acid to produce sodium sulfate, water, and carbon dioxide. c. the treatment of phosphorus penta ...
AP Syllabus
... scientific notation, density, heat quantities, etc. 3. Distinguish between the three classes of matter. 4. Discuss and distinguish between physical and chemical properties and changes. 5. Describe the structure of the atom complete with extensive electron placement. Discuss quantum numbers and use t ...
... scientific notation, density, heat quantities, etc. 3. Distinguish between the three classes of matter. 4. Discuss and distinguish between physical and chemical properties and changes. 5. Describe the structure of the atom complete with extensive electron placement. Discuss quantum numbers and use t ...
Exercise II
... concepts inherent in more general SN 2 reactions. In this exercise we will examine both an identity SN 2 reaction as well as a more general SN 2 reaction. In the reaction above the two species: Cl, CH3Cl; ClCH3 Cl, are called ion–molecule complexes. They are formed when the anion and the mol ...
... concepts inherent in more general SN 2 reactions. In this exercise we will examine both an identity SN 2 reaction as well as a more general SN 2 reaction. In the reaction above the two species: Cl, CH3Cl; ClCH3 Cl, are called ion–molecule complexes. They are formed when the anion and the mol ...
File - wilson science WEBSITE
... 8. For a certain reactions at 25oC, the value of K is 1.2 x 10-3. At 50oC, the value of K is 3.4 x 10-1. This means that the reaction is a. exothermic b. endothermic c. more information is needed 9. Given the equation A(g) ↔ B(g) + 2C(g). At a particular temperature, K = 1.4 x 105. If you initially ...
... 8. For a certain reactions at 25oC, the value of K is 1.2 x 10-3. At 50oC, the value of K is 3.4 x 10-1. This means that the reaction is a. exothermic b. endothermic c. more information is needed 9. Given the equation A(g) ↔ B(g) + 2C(g). At a particular temperature, K = 1.4 x 105. If you initially ...
Chapter 4: Properties of Gases
... 60.0 mL of O2 was collected over water at a total pressure of 755 torr and at a temperature of 25oC. The vapor pressure of water at 25oC is 24 torr. How many moles of O2 were collected? (a)2.44 x 10-3 mol (c)2.51 x 10-3 mol ...
... 60.0 mL of O2 was collected over water at a total pressure of 755 torr and at a temperature of 25oC. The vapor pressure of water at 25oC is 24 torr. How many moles of O2 were collected? (a)2.44 x 10-3 mol (c)2.51 x 10-3 mol ...
Comparison of 2008 to 2000 SCH3U_ud
... cleaning product, materials used in electronics and batteries) and how that substance affects the environment, and propose ways to lessen the harmfulness of the substance (e.g., by reducing the amount used, by modifying one of its chemical components) or identify alternative substances that could be ...
... cleaning product, materials used in electronics and batteries) and how that substance affects the environment, and propose ways to lessen the harmfulness of the substance (e.g., by reducing the amount used, by modifying one of its chemical components) or identify alternative substances that could be ...
Because the iron sheet is denser than the iron powder. Because
... A beach ball rests on the sand. When the wind blows, the ball rolls away. Which statement correctly assesses the reason for this change in motion? The ball moved because an unbalanced force acted upon it. The ball moved because a balanced force acted upon it. The ball moved because the force of gra ...
... A beach ball rests on the sand. When the wind blows, the ball rolls away. Which statement correctly assesses the reason for this change in motion? The ball moved because an unbalanced force acted upon it. The ball moved because a balanced force acted upon it. The ball moved because the force of gra ...
AP Chemistry Unit 3 Test Review Topics Covered: Gases Liquids
... coefficients should be in terms of lowest whole numbers. Assume that solutions are aqueous unless otherwise indicated. Represent substances in solutions as ions if the substances are extensively ionized. Omit formulas for any ions or molecules that are unchanged by the reaction. 3. Explain each of t ...
... coefficients should be in terms of lowest whole numbers. Assume that solutions are aqueous unless otherwise indicated. Represent substances in solutions as ions if the substances are extensively ionized. Omit formulas for any ions or molecules that are unchanged by the reaction. 3. Explain each of t ...
File - Chem with Appleby
... Questions: An Exothermic Equilibrium-36 The ________________________ for producing ammonia from the elements is exothermic. • One would think that cooling down the reactants would result in more product. • However, the activation energy for this reaction is _______________! • This is the _______ in ...
... Questions: An Exothermic Equilibrium-36 The ________________________ for producing ammonia from the elements is exothermic. • One would think that cooling down the reactants would result in more product. • However, the activation energy for this reaction is _______________! • This is the _______ in ...
Chapter 3
... 62. Allicin is the compound responsible for the characteristic smell of garlic. An analysis of the compound gives the following percent composition by mass: C: 44.4 percent; H: 6.21 percent; S: 39.5 percent; O: 9.86 percent. What is its molecular formula given that its molar mass is about 162 g? A) ...
... 62. Allicin is the compound responsible for the characteristic smell of garlic. An analysis of the compound gives the following percent composition by mass: C: 44.4 percent; H: 6.21 percent; S: 39.5 percent; O: 9.86 percent. What is its molecular formula given that its molar mass is about 162 g? A) ...
Final Exam - Dawson College
... Limestone, CaCO3, reacts with hydrochloric acid to form calcium chloride, water and carbon dioxide according to the following reaction: CaCO3(s) + 2HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g) How many liters of CO2 gas will be formed at 755 torr and 33.0°C by the reaction of 2.35 g of limestone with an ex ...
... Limestone, CaCO3, reacts with hydrochloric acid to form calcium chloride, water and carbon dioxide according to the following reaction: CaCO3(s) + 2HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g) How many liters of CO2 gas will be formed at 755 torr and 33.0°C by the reaction of 2.35 g of limestone with an ex ...
Section 2 Chemical Formulas and Equations
... From Reactants to Products When carbon burns, it reacts with oxygen to form carbon dioxide. Figure 5 shows how to write an equation to describe this reaction. The starting materials in a chemical reaction are reactants. The substances formed from a reaction are products. In this example, carbon and ...
... From Reactants to Products When carbon burns, it reacts with oxygen to form carbon dioxide. Figure 5 shows how to write an equation to describe this reaction. The starting materials in a chemical reaction are reactants. The substances formed from a reaction are products. In this example, carbon and ...
Powerpoint
... Copper metal of the anode completes with OH-. The potential of the first half-reaction is larger. Copper metal, rather than OH-, gives out electrons. In principle, if platinum electrode is used, platinum may also give out electrons to form platinum ion. But in practice, it seldom happens due to the ...
... Copper metal of the anode completes with OH-. The potential of the first half-reaction is larger. Copper metal, rather than OH-, gives out electrons. In principle, if platinum electrode is used, platinum may also give out electrons to form platinum ion. But in practice, it seldom happens due to the ...
Unit 3 Revision Notes 213.00KB 2017-03-01 18
... e.g. Magnesium + oxygen = Magnesium oxide When an exothermic reaction occurs, the products of the reaction have less energy than the reactants, since some energy has been released. This can be shown on an 'Energy Profile' Magnesium + Oxygen Energy ...
... e.g. Magnesium + oxygen = Magnesium oxide When an exothermic reaction occurs, the products of the reaction have less energy than the reactants, since some energy has been released. This can be shown on an 'Energy Profile' Magnesium + Oxygen Energy ...
8 Chemical Equations Chapter Outline Chemical Equations
... Write the balanced chemical equation for the reaction of magnesium hydroxide and phosphoric acid to form magnesium phosphate and water. a. 3 Mg(OH)2 + 2 H3PO4 b. Mg(OH)2 + H3PO4 ...
... Write the balanced chemical equation for the reaction of magnesium hydroxide and phosphoric acid to form magnesium phosphate and water. a. 3 Mg(OH)2 + 2 H3PO4 b. Mg(OH)2 + H3PO4 ...
Fall 2012
... at 10,000 m where the temperature is expected to be -10.3 °C and the pressure will be around 420 torr. What is the maximum volume of helium that the meteorologist can put in the balloon at 723.1 torr and 27.3 °C (conditions on the earth's surface) that will allow cruising at 10,000 m without exceedi ...
... at 10,000 m where the temperature is expected to be -10.3 °C and the pressure will be around 420 torr. What is the maximum volume of helium that the meteorologist can put in the balloon at 723.1 torr and 27.3 °C (conditions on the earth's surface) that will allow cruising at 10,000 m without exceedi ...
Stoichiometry
Stoichiometry /ˌstɔɪkiˈɒmɨtri/ is the calculation of relative quantities of reactants and products in chemical reactions.Stoichiometry is founded on the law of conservation of mass where the total mass of the reactants equals the total mass of the products leading to the insight that the relations among quantities of reactants and products typically form a ratio of positive integers. This means that if the amounts of the separate reactants are known, then the amount of the product can be calculated. Conversely, if one reactant has a known quantity and the quantity of product can be empirically determined, then the amount of the other reactants can also be calculated.As seen in the image to the right, where the balanced equation is:CH4 + 2 O2 → CO2 + 2 H2O.Here, one molecule of methane reacts with two molecules of oxygen gas to yield one molecule of carbon dioxide and two molecules of water. Stoichiometry measures these quantitative relationships, and is used to determine the amount of products/reactants that are produced/needed in a given reaction. Describing the quantitative relationships among substances as they participate in chemical reactions is known as reaction stoichiometry. In the example above, reaction stoichiometry measures the relationship between the methane and oxygen as they react to form carbon dioxide and water.Because of the well known relationship of moles to atomic weights, the ratios that are arrived at by stoichiometry can be used to determine quantities by weight in a reaction described by a balanced equation. This is called composition stoichiometry.Gas stoichiometry deals with reactions involving gases, where the gases are at a known temperature, pressure, and volume and can be assumed to be ideal gases. For gases, the volume ratio is ideally the same by the ideal gas law, but the mass ratio of a single reaction has to be calculated from the molecular masses of the reactants and products. In practice, due to the existence of isotopes, molar masses are used instead when calculating the mass ratio.