CHEMISTRY 123-07 Midterm #1 – Answer key October 14, 2010
... PART II: SHORT ANSWER (Each short answer question has a 1-point value!!) 31. Molarity is defined as the number of moles of solute per volume of solution in liters. 32. Ions that contain atoms of more than one element are called polyatomic ions. 33. Proton donors are known as Brønsted acids. 34. A co ...
... PART II: SHORT ANSWER (Each short answer question has a 1-point value!!) 31. Molarity is defined as the number of moles of solute per volume of solution in liters. 32. Ions that contain atoms of more than one element are called polyatomic ions. 33. Proton donors are known as Brønsted acids. 34. A co ...
Midterm Practice Exam Key
... 1. A substance is considered ____________ if it will dissolve in a specific solvent. 2. An ____________ in the oxidation number of an atom signifies oxidation, while a ____________ in the oxidation number signifies reduction. 3. A ____________ reaction is one in which the aqueous (dissolved) ions ...
... 1. A substance is considered ____________ if it will dissolve in a specific solvent. 2. An ____________ in the oxidation number of an atom signifies oxidation, while a ____________ in the oxidation number signifies reduction. 3. A ____________ reaction is one in which the aqueous (dissolved) ions ...
File - Junior College Chemistry tuition
... Gaseous particle U has an atomic number n and a charge of +1. Gaseous particle V has an atomic number of (n + 1) and is isoelectronic with U. Which of the following statements is always true? ...
... Gaseous particle U has an atomic number n and a charge of +1. Gaseous particle V has an atomic number of (n + 1) and is isoelectronic with U. Which of the following statements is always true? ...
Unit 8: Reactions - Mark Rosengarten
... balanced, there should be two chlorine atoms on each side. There are already two on the right, so put a 2 coefficient in front of NaCl: 2 NaCl Na + Cl2 * This messes up the balancing of Na, so place a 2 in front of the Na on the right side to balance this off: 2 NaCl 2 Na + Cl2 * There are now 2 ...
... balanced, there should be two chlorine atoms on each side. There are already two on the right, so put a 2 coefficient in front of NaCl: 2 NaCl Na + Cl2 * This messes up the balancing of Na, so place a 2 in front of the Na on the right side to balance this off: 2 NaCl 2 Na + Cl2 * There are now 2 ...
Chap. 5 "Properties of Enzymes" Reading Assignment: pp. 130
... Enzymes are able to increase rates of reactions by 103 to 1017 fold over the rate of the uncatalyzed reaction. It is important to note that enzymes do not change the positions of chemical equilibrium, they just increase the rate at which equilibrium is attained. By having a shape complementary to th ...
... Enzymes are able to increase rates of reactions by 103 to 1017 fold over the rate of the uncatalyzed reaction. It is important to note that enzymes do not change the positions of chemical equilibrium, they just increase the rate at which equilibrium is attained. By having a shape complementary to th ...
UNIT I: Introduction to Chemistry
... c. Differentiate between nuclear fission and fusion. d. Identify the common uses of nuclear fission and fusion. e. Balance a nuclear equation. [GT] f. Explain how the process of decay can change the isotope’s atomic and mass numbers. [GT] g. Compare the relative amounts of energy released from chemi ...
... c. Differentiate between nuclear fission and fusion. d. Identify the common uses of nuclear fission and fusion. e. Balance a nuclear equation. [GT] f. Explain how the process of decay can change the isotope’s atomic and mass numbers. [GT] g. Compare the relative amounts of energy released from chemi ...
ΔH - GCC
... Calculate the overall change in internal energy, ΔU, (in joules) for a system that absorbs 188 J of heat and does 141 J of work on its surroundings. Strategy Combine the two contributions to internal energy using ΔU = q + w and the sign conventions for q and w. Solution The system absorbs heat, so q ...
... Calculate the overall change in internal energy, ΔU, (in joules) for a system that absorbs 188 J of heat and does 141 J of work on its surroundings. Strategy Combine the two contributions to internal energy using ΔU = q + w and the sign conventions for q and w. Solution The system absorbs heat, so q ...
Section 4.9 Oxidation–Reduction Reactions
... results from the combustion of fossil fuels. • This is the balanced equation for the combustion of octane (gasoline) • 2 C8H18 (l) + 25 O2 (g) → 16 CO2 (g) + 18 H2O (g) ...
... results from the combustion of fossil fuels. • This is the balanced equation for the combustion of octane (gasoline) • 2 C8H18 (l) + 25 O2 (g) → 16 CO2 (g) + 18 H2O (g) ...
〈541〉 TITRIMETRY
... titrate), with an appropriate standardized solution (the titrant), the endpoint being determined instrumentally or visually with the aid of a suitable indicator. The titrant is added from a suitable buret and is so chosen, with respect to its strength (normality), that the volume added is between 30 ...
... titrate), with an appropriate standardized solution (the titrant), the endpoint being determined instrumentally or visually with the aid of a suitable indicator. The titrant is added from a suitable buret and is so chosen, with respect to its strength (normality), that the volume added is between 30 ...
Chem 1202
... However, most chemical reactions are not carried out at constant volume. They are usually carried out at constant pressure (in the open atmosphere). So a new state function was invented for contant pressure processes. Watkins ...
... However, most chemical reactions are not carried out at constant volume. They are usually carried out at constant pressure (in the open atmosphere). So a new state function was invented for contant pressure processes. Watkins ...
H o - CashmereChemistry
... which appear on both sides of the arrows. Use the bracket keys on your calculator to add up the ∆H values. It’s very easy to make errors in the exam, so do ...
... which appear on both sides of the arrows. Use the bracket keys on your calculator to add up the ∆H values. It’s very easy to make errors in the exam, so do ...
Thermodynamics of Combustion
... Combustion is an oxidation process and is usually exothermic (i.e. releases the chemical (or bond) energy contained in a fuel as thermal energy). The most common combustion processes encountered in engineering are those which convert a hydrocarbon fuel (which might range from pure hydrogen to almost ...
... Combustion is an oxidation process and is usually exothermic (i.e. releases the chemical (or bond) energy contained in a fuel as thermal energy). The most common combustion processes encountered in engineering are those which convert a hydrocarbon fuel (which might range from pure hydrogen to almost ...
Researches of the system of neutralization process control in the
... the silver-chlorine electrodes, is described by the following equation: EB ...
... the silver-chlorine electrodes, is described by the following equation: EB ...
Chapter 4 Aqueous Reactions and Solution Stoichiometry
... Check: We can check our result by confirming that both the elements and the electric charge are balanced. Each side has one Ca, one C, and three O, and the net charge on each side equals 0. Comment: If none of the ions in an ionic equation is removed from solution or changed in some way, then they a ...
... Check: We can check our result by confirming that both the elements and the electric charge are balanced. Each side has one Ca, one C, and three O, and the net charge on each side equals 0. Comment: If none of the ions in an ionic equation is removed from solution or changed in some way, then they a ...
Chemical equilibrium
In a chemical reaction, chemical equilibrium is the state in which both reactants and products are present in concentrations which have no further tendency to change with time. Usually, this state results when the forward reaction proceeds at the same rate as the reverse reaction. The reaction rates of the forward and backward reactions are generally not zero, but equal. Thus, there are no net changes in the concentrations of the reactant(s) and product(s). Such a state is known as dynamic equilibrium.