Exam 2 Key
... (0.0821 L atm/mol K)(298 K) So, we have 0.0424 mol gas with a mass of 1.27 g, giving a molar mass of: 1.27 g = 29.95 g/mol 0.0424 mol The molar mass of NO = 30.0 g/mol and the molar mass of N2O = 44.0 g/mol. Therefore, the gas must be NO. (note there are many other ways to go about this, all of whic ...
... (0.0821 L atm/mol K)(298 K) So, we have 0.0424 mol gas with a mass of 1.27 g, giving a molar mass of: 1.27 g = 29.95 g/mol 0.0424 mol The molar mass of NO = 30.0 g/mol and the molar mass of N2O = 44.0 g/mol. Therefore, the gas must be NO. (note there are many other ways to go about this, all of whic ...
1. Bromine exists naturally as a mixture of bromine
... Analysis shows the compound to be 80% X by mass, with three times as many hydrogen atoms as X atoms per molecule. Which element is element X? A) He B) C C) F D) S E) none of these ...
... Analysis shows the compound to be 80% X by mass, with three times as many hydrogen atoms as X atoms per molecule. Which element is element X? A) He B) C C) F D) S E) none of these ...
che201ch2atomsmoleculesandions
... When two elements form a series of compounds, the ratios of the masses of the second element that combine with 1 gram of the first element can always be reduced to small whole numbers. ...
... When two elements form a series of compounds, the ratios of the masses of the second element that combine with 1 gram of the first element can always be reduced to small whole numbers. ...
Student Study Guide 1999
... In the laboratory fume hood, Sylvia and Tom heated a white solid, potassium chlorate. They observed that a gas was given off. They collected this gas by the displacement of water. After plunging a glowing wood splint into it, they saw that the splint burst into ...
... In the laboratory fume hood, Sylvia and Tom heated a white solid, potassium chlorate. They observed that a gas was given off. They collected this gas by the displacement of water. After plunging a glowing wood splint into it, they saw that the splint burst into ...
L22 - Supplementary Student Notes Package
... EX: Solutions of sodium bromide and lead(II) acetate are mixed together. The precipitate is filtered, dried, and found to have a mass of 2.17 g. What minimum mass of lead(II) acetate was dissolved in the original solution? ...
... EX: Solutions of sodium bromide and lead(II) acetate are mixed together. The precipitate is filtered, dried, and found to have a mass of 2.17 g. What minimum mass of lead(II) acetate was dissolved in the original solution? ...
Unit D: Quantitative Relationships in Chemical Change
... EX: Solutions of sodium bromide and lead(II) acetate are mixed together. The precipitate is filtered, dried, and found to have a mass of 2.17 g. What minimum mass of lead(II) acetate was dissolved in the original solution? ...
... EX: Solutions of sodium bromide and lead(II) acetate are mixed together. The precipitate is filtered, dried, and found to have a mass of 2.17 g. What minimum mass of lead(II) acetate was dissolved in the original solution? ...
Thermochemistry
... object (various types of molecular motion and the movement of electrons within molecules). Potential energy - energy available by virtue of an object’s position (determined by the attractive and repulsive forces at the atomic level) . It is impossible to measure all these contributions accurately, s ...
... object (various types of molecular motion and the movement of electrons within molecules). Potential energy - energy available by virtue of an object’s position (determined by the attractive and repulsive forces at the atomic level) . It is impossible to measure all these contributions accurately, s ...
Document
... You can treat reactions as if they happen liters at a time, as long as you keep the temperature and pressure the same. 1 mole = 22.4 L @ STP ...
... You can treat reactions as if they happen liters at a time, as long as you keep the temperature and pressure the same. 1 mole = 22.4 L @ STP ...
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... 5. Carefully detach the last page. It is the datasheet. 6. Now answer the exam questions. Questions are not in order of difficulty. Indicate your choice on the STUDENT RESPONSE sheet by marking one letter beside the question number. • Mark only one answer for each question. • Questions are all of th ...
... 5. Carefully detach the last page. It is the datasheet. 6. Now answer the exam questions. Questions are not in order of difficulty. Indicate your choice on the STUDENT RESPONSE sheet by marking one letter beside the question number. • Mark only one answer for each question. • Questions are all of th ...
11.2 Types of Chemical Reactions
... ionic compounds are mixed, nothing happens. At other times, the ions in the two solutions react. Figure 11.8 shows that mixing aqueous solutions of potassium carbonate and barium chloride results in a chemical reaction. A white precipitate of solid barium carbonate is formed. Potassium chloride, the ...
... ionic compounds are mixed, nothing happens. At other times, the ions in the two solutions react. Figure 11.8 shows that mixing aqueous solutions of potassium carbonate and barium chloride results in a chemical reaction. A white precipitate of solid barium carbonate is formed. Potassium chloride, the ...
The Atom
... Erwin Schrödinger and Werner Heisenberg’s work with the uncertainty principle explained that electrons do not travel in orbits. In fact, the exact path of a moving electron Schrödinger & Heisenberg cannot be predicted. © Fall 2005, Pflugerville ISD, 8th Grade ...
... Erwin Schrödinger and Werner Heisenberg’s work with the uncertainty principle explained that electrons do not travel in orbits. In fact, the exact path of a moving electron Schrödinger & Heisenberg cannot be predicted. © Fall 2005, Pflugerville ISD, 8th Grade ...
Chapter 6: Thermochemistry
... 29. A gas is compressed in a cylinder from a volume of 20.0 L to 2.0 L by a constant pressure of 10.0 atm. Calculate the amount of work done on the system. A) 1.01 104 J B) –180 J C) 1.81 104 J D) –1.81 104 J E) 180 J 30. Calculate the amount of work done against an atmospheric pressure of 1.0 ...
... 29. A gas is compressed in a cylinder from a volume of 20.0 L to 2.0 L by a constant pressure of 10.0 atm. Calculate the amount of work done on the system. A) 1.01 104 J B) –180 J C) 1.81 104 J D) –1.81 104 J E) 180 J 30. Calculate the amount of work done against an atmospheric pressure of 1.0 ...
Porous silicon-based nanostructured microparticles as degradable
... Synthesis of 11-undecenylamine (Schematic 1 (2)): LiAlH4 (2.7 g, 71.1 mmol) was placed in a 250 mL round-bottom flask containing 50 mL of anhydrous THF, and the mixture was heated at reflux for 30 minutes under N2. Heating was stopped and a solution of 9-undecenamide (5.0 g, 27.3 mmol) in 100 mL of ...
... Synthesis of 11-undecenylamine (Schematic 1 (2)): LiAlH4 (2.7 g, 71.1 mmol) was placed in a 250 mL round-bottom flask containing 50 mL of anhydrous THF, and the mixture was heated at reflux for 30 minutes under N2. Heating was stopped and a solution of 9-undecenamide (5.0 g, 27.3 mmol) in 100 mL of ...
Atoms, Molecules, and Ions
... There are many substances that exist as two or more atoms connected together so strongly that they behave as a single particle. These multiatom combinations are called molecules13. A molecule is the smallest part of a substance that has the physical and chemical properties of that substance. In some ...
... There are many substances that exist as two or more atoms connected together so strongly that they behave as a single particle. These multiatom combinations are called molecules13. A molecule is the smallest part of a substance that has the physical and chemical properties of that substance. In some ...
Comparison of 2008 to 2000 SCH3U_ud
... chemical reactions (e.g., electronegativity, chemical bond, periodic trend, ionization energy, electron affinity); -predict the products of, and write chemical equations to represent, synthesis, decomposition, substitution, and double displacement reactions, and test the predictions through experime ...
... chemical reactions (e.g., electronegativity, chemical bond, periodic trend, ionization energy, electron affinity); -predict the products of, and write chemical equations to represent, synthesis, decomposition, substitution, and double displacement reactions, and test the predictions through experime ...
1. True
... ΔScond = q/T = ΔHfus /TMP = 5020 J · mol−1 · K−1 /159 K = +31.5723 J · mol ·K 19.1. Which of the following statements is FALSE? 1. The total amount of energy and matter in the Universe is constant. 2. Breaking chemical bonds is an endothermic process. 3. It is more efficient to use a primary energy ...
... ΔScond = q/T = ΔHfus /TMP = 5020 J · mol−1 · K−1 /159 K = +31.5723 J · mol ·K 19.1. Which of the following statements is FALSE? 1. The total amount of energy and matter in the Universe is constant. 2. Breaking chemical bonds is an endothermic process. 3. It is more efficient to use a primary energy ...
A Review of High School Chemistry
... materials and not only came up with the law of multiple proportions, but also a relative ratio of weights of the different elements. For example, they found that by assigning hydrogen, the lightest element, an ATOMIC MASS UNIT of one, the following approximate relative ratios of other elements were: ...
... materials and not only came up with the law of multiple proportions, but also a relative ratio of weights of the different elements. For example, they found that by assigning hydrogen, the lightest element, an ATOMIC MASS UNIT of one, the following approximate relative ratios of other elements were: ...
PDF w
... more properly that the phosphorus atom in the ester is a class (a) electrophilic center. The oxygen atom of peroxides is a class (b) electrophilic center. Nucleophiles also can be classified as hard (nonpolarizable) or soft (polarizable). Furthermore we can now examine equilibrium data for other Lew ...
... more properly that the phosphorus atom in the ester is a class (a) electrophilic center. The oxygen atom of peroxides is a class (b) electrophilic center. Nucleophiles also can be classified as hard (nonpolarizable) or soft (polarizable). Furthermore we can now examine equilibrium data for other Lew ...
The Discovery of the Atomic World and the Constituents of
... were in constant motion around the nucleus in particular orbits then they would not fall into the nucleus due to centrifugal force. Electrons could jump from one orbit to another and could not occupy any position between the orbits. The reason why nuclei of two or more protons do not fly apart is du ...
... were in constant motion around the nucleus in particular orbits then they would not fall into the nucleus due to centrifugal force. Electrons could jump from one orbit to another and could not occupy any position between the orbits. The reason why nuclei of two or more protons do not fly apart is du ...
Ch. 8.3 – Bonding Theories
... When two atoms combine, the molecular orbital model assumes that their atomic orbitals overlap to produce molecular orbitals, or orbitals that apply to the entire molecule. ...
... When two atoms combine, the molecular orbital model assumes that their atomic orbitals overlap to produce molecular orbitals, or orbitals that apply to the entire molecule. ...
Homework Chapter 6 - Chemistry
... 23. During volcanic eruptions, hydrogen sulfide gas is given off and oxidized by air according to the following chemical equation: 2H2S(g) + 3O2(g) 2SO2(g) + 2H2O(g) Calculate the standard enthalpy change for the above reaction given: 3S(s) + 2H2O(g) 2H2S(g) + SO2(g) H° = 146.9 kJ/mol S(s) + O2 ...
... 23. During volcanic eruptions, hydrogen sulfide gas is given off and oxidized by air according to the following chemical equation: 2H2S(g) + 3O2(g) 2SO2(g) + 2H2O(g) Calculate the standard enthalpy change for the above reaction given: 3S(s) + 2H2O(g) 2H2S(g) + SO2(g) H° = 146.9 kJ/mol S(s) + O2 ...
Theoretical Competition - Austrian Chemistry Olympiad
... Write your answers in the boxes provided for them. Only these answers will be marked. If you don’t have enough space, then you may use draft paper with the remark “belongs to part x.xx“, whereby x.xx means the part of the task in italics. You may take the PTE and the draft paper with you after the c ...
... Write your answers in the boxes provided for them. Only these answers will be marked. If you don’t have enough space, then you may use draft paper with the remark “belongs to part x.xx“, whereby x.xx means the part of the task in italics. You may take the PTE and the draft paper with you after the c ...
Molarity = M (Concentration of Solutions)
... Gas Law Stoichiometry - I - NH3 + HCl Problem: A slide separating two containers is removed, and the gases are allowed to mix and react. The first container with a volume of 2.79 L contains Ammonia gas at a pressure of 0.776 atm and a temperature of 18.7 oC. The second with a volume of 1.16 L conta ...
... Gas Law Stoichiometry - I - NH3 + HCl Problem: A slide separating two containers is removed, and the gases are allowed to mix and react. The first container with a volume of 2.79 L contains Ammonia gas at a pressure of 0.776 atm and a temperature of 18.7 oC. The second with a volume of 1.16 L conta ...
H 2 O
... Effect of Linear Energy Transfer (LET) • The distribution of energy deposits vary: the probably of short tracks increases with LET depending on the placement of the clusters of radicals (spurs). • The recombinations in the heterogenous zones are much more probable as the LET is elevated because the ...
... Effect of Linear Energy Transfer (LET) • The distribution of energy deposits vary: the probably of short tracks increases with LET depending on the placement of the clusters of radicals (spurs). • The recombinations in the heterogenous zones are much more probable as the LET is elevated because the ...