3(aq)
... 1. water is formed 2. a tremendous amount of energy is released. • Burning of coal, which occurs in power plants to create electricity, is a reaction between carbon & oxygen to produce carbon dioxide. C(s) + O2 CO2(g) (a combustion & synthesis rxn) ...
... 1. water is formed 2. a tremendous amount of energy is released. • Burning of coal, which occurs in power plants to create electricity, is a reaction between carbon & oxygen to produce carbon dioxide. C(s) + O2 CO2(g) (a combustion & synthesis rxn) ...
Exam Review Chapter 18-Equilibrium
... b. decrease. d. vary unpredictably. 10. Which of the following is true concerning the impact of increasing temperature on reaction rates? a. The number of collisions between reactant atoms is increased. b. The energy of each reactant atom is increased. c. The percentage of collisions with sufficient ...
... b. decrease. d. vary unpredictably. 10. Which of the following is true concerning the impact of increasing temperature on reaction rates? a. The number of collisions between reactant atoms is increased. b. The energy of each reactant atom is increased. c. The percentage of collisions with sufficient ...
Bonding 1. Which one of the following is most likely to be an ionic
... 7. Consider the following gas-phase equilibrium: H2(g) + I2(g) ↔ 2HI(g) At a certain temperature, the equilibrium constant Kc is 4.0. Starting with equimolar quantities of H2 and I2 and no HI, when equilibrium was established, 0.20 moles of HI was present. How much H2 was used to start the reaction ...
... 7. Consider the following gas-phase equilibrium: H2(g) + I2(g) ↔ 2HI(g) At a certain temperature, the equilibrium constant Kc is 4.0. Starting with equimolar quantities of H2 and I2 and no HI, when equilibrium was established, 0.20 moles of HI was present. How much H2 was used to start the reaction ...
1st Semester Exam in High School Chemistry
... 7. Which of the following BEST describes what happens when most substances change from a solid state to a liquid state? A. The molecules slow down. B. The molecules move farther apart. C. The molecules get smaller. D. The molecules lose energy. ...
... 7. Which of the following BEST describes what happens when most substances change from a solid state to a liquid state? A. The molecules slow down. B. The molecules move farther apart. C. The molecules get smaller. D. The molecules lose energy. ...
+ H 2 (g)
... b. equation must contain the correct formulas for the reactants and products. c. law of conservation of mass must be satisfied. ...
... b. equation must contain the correct formulas for the reactants and products. c. law of conservation of mass must be satisfied. ...
Chemical Reactions
... the chemical reaction • Law of conservation of mass (or matter)- mass is neither created or destroyed in ordinary chemical or physical changes • Subscript - number (representing atoms) written below and to the right of a chemical symbol ...
... the chemical reaction • Law of conservation of mass (or matter)- mass is neither created or destroyed in ordinary chemical or physical changes • Subscript - number (representing atoms) written below and to the right of a chemical symbol ...
Problem Set 2
... Then indicate: a) The oxidation step: ----------------------------------------------------b) The reduction step: ------------------------------------------------------c) The oxidizing agent: ------------------------------------------------------d) The reducing agent: -------------------------------- ...
... Then indicate: a) The oxidation step: ----------------------------------------------------b) The reduction step: ------------------------------------------------------c) The oxidizing agent: ------------------------------------------------------d) The reducing agent: -------------------------------- ...
Chapter 6 Chemical reactions Classification And Mass Relationships
... • When two things have different sizes you can't get equal numbers by taking equal weights. For example since one grape weighs less than one cabbage, one pound of each will have different numbers. • The same is true for atoms or molecules of different substances. Equal numbers hydrogen and glucose m ...
... • When two things have different sizes you can't get equal numbers by taking equal weights. For example since one grape weighs less than one cabbage, one pound of each will have different numbers. • The same is true for atoms or molecules of different substances. Equal numbers hydrogen and glucose m ...
EXPERIMENT 11 (2 Weeks)!
... NaF(aq) + HNO3 (aq) HF (aq) + NaNO3 (aq) HF is a weak acid E. Combustion Reactions A combustion reaction is the reaction of an organic compound with oxygen producing carbon dioxide and water. This reaction gives off heat and light. An organic compound will contain carbon and hydrogen in its formul ...
... NaF(aq) + HNO3 (aq) HF (aq) + NaNO3 (aq) HF is a weak acid E. Combustion Reactions A combustion reaction is the reaction of an organic compound with oxygen producing carbon dioxide and water. This reaction gives off heat and light. An organic compound will contain carbon and hydrogen in its formul ...
quarter 4 final exam guide - District 196 e
... and cooled to 20.0 degrees Celcius. How much energy is given off in this entire process? (Use a diagram “temperature versus time” to visualize what happens as energy is removed from the system – identify the potential and kinetic energy changes on this diagram.) ...
... and cooled to 20.0 degrees Celcius. How much energy is given off in this entire process? (Use a diagram “temperature versus time” to visualize what happens as energy is removed from the system – identify the potential and kinetic energy changes on this diagram.) ...
Chemistry 432: Final Exam Review Sheet
... 1. Layout of the periodic table: metals, non- metals, metalloids, alkali metals, alkali earth metals, halogens, noble gases, groups and charges, oxidation numbers, general properties of metals, nonmetals, and metaloids; transition metals/elements. (8 questions) 2. Types of chemical reactions, writin ...
... 1. Layout of the periodic table: metals, non- metals, metalloids, alkali metals, alkali earth metals, halogens, noble gases, groups and charges, oxidation numbers, general properties of metals, nonmetals, and metaloids; transition metals/elements. (8 questions) 2. Types of chemical reactions, writin ...
final-H-2006-07-v1
... 40. In Figure 14-4, where do the three phases exist in equilibrium? a. only at the origin c. on any solid line b. only at the triple point d. between any two solid lines 41. In Figure 14-4, what phase would be present at 15 oC and 20 mmHg? a. solid b. liquid c. gas d. vapor 42. Which of the followin ...
... 40. In Figure 14-4, where do the three phases exist in equilibrium? a. only at the origin c. on any solid line b. only at the triple point d. between any two solid lines 41. In Figure 14-4, what phase would be present at 15 oC and 20 mmHg? a. solid b. liquid c. gas d. vapor 42. Which of the followin ...
final-H-2006-07-v2
... d. being represented by the symbol M e. all of the above 77. Mole fraction is a. moles of reactant compared to moles product b. moles of acid compared to moles of base c. moles of substance compared to total moles 78. A solution which, upon mixing for a long period of time, still contains undissolve ...
... d. being represented by the symbol M e. all of the above 77. Mole fraction is a. moles of reactant compared to moles product b. moles of acid compared to moles of base c. moles of substance compared to total moles 78. A solution which, upon mixing for a long period of time, still contains undissolve ...
Classifying Chemical Reactions by What Atoms Do
... Acid-Base Titrations The difficulty is determining when there has been just enough titrant added to complete the reaction. In acid-base titrations, because both the reactant and product solutions are colorless, a chemical (indicator) is added that changes color when the solution undergoes large cha ...
... Acid-Base Titrations The difficulty is determining when there has been just enough titrant added to complete the reaction. In acid-base titrations, because both the reactant and product solutions are colorless, a chemical (indicator) is added that changes color when the solution undergoes large cha ...
Chemical reaction
A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. Classically, chemical reactions encompass changes that only involve the positions of electrons in the forming and breaking of chemical bonds between atoms, with no change to the nuclei (no change to the elements present), and can often be described by a chemical equation. Nuclear chemistry is a sub-discipline of chemistry that involves the chemical reactions of unstable and radioactive elements where both electronic and nuclear changes may occur.The substance (or substances) initially involved in a chemical reaction are called reactants or reagents. Chemical reactions are usually characterized by a chemical change, and they yield one or more products, which usually have properties different from the reactants. Reactions often consist of a sequence of individual sub-steps, the so-called elementary reactions, and the information on the precise course of action is part of the reaction mechanism. Chemical reactions are described with chemical equations, which symbolically present the starting materials, end products, and sometimes intermediate products and reaction conditions.Chemical reactions happen at a characteristic reaction rate at a given temperature and chemical concentration. Typically, reaction rates increase with increasing temperature because there is more thermal energy available to reach the activation energy necessary for breaking bonds between atoms.Reactions may proceed in the forward or reverse direction until they go to completion or reach equilibrium. Reactions that proceed in the forward direction to approach equilibrium are often described as spontaneous, requiring no input of free energy to go forward. Non-spontaneous reactions require input of free energy to go forward (examples include charging a battery by applying an external electrical power source, or photosynthesis driven by absorption of electromagnetic radiation in the form of sunlight).Different chemical reactions are used in combinations during chemical synthesis in order to obtain a desired product. In biochemistry, a consecutive series of chemical reactions (where the product of one reaction is the reactant of the next reaction) form metabolic pathways. These reactions are often catalyzed by protein enzymes. Enzymes increase the rates of biochemical reactions, so that metabolic syntheses and decompositions impossible under ordinary conditions can occur at the temperatures and concentrations present within a cell.The general concept of a chemical reaction has been extended to reactions between entities smaller than atoms, including nuclear reactions, radioactive decays, and reactions between elementary particles as described by quantum field theory.