Calorimetry Key - Iowa State University
... Consider the reverse reaction, namely, the formation of H2 (g) and O2 (g) from H2O (l). a. Is this reaction exothermic or endothermic? (Circle one) 4. Given the following information, circle the term that best completes the statement. Ag2O(s) 2 Ag(s) + ½ O2(g) ΔH° = 31.05 kJ a. Heat is released/ab ...
... Consider the reverse reaction, namely, the formation of H2 (g) and O2 (g) from H2O (l). a. Is this reaction exothermic or endothermic? (Circle one) 4. Given the following information, circle the term that best completes the statement. Ag2O(s) 2 Ag(s) + ½ O2(g) ΔH° = 31.05 kJ a. Heat is released/ab ...
Advanced Physical Chemistry Problems (VIII)
... three gases, and use this datum with the volume to obtain the final density. 7. N H4 H S(s) dissociates according to the equation: N H4 H S(s)* ) N H3 (g) + H2 S(g) At a certain temperature, the dissociation pressure of the pure solid is 50 mm Hg. This represents the total pressure when N H4 HS(s) i ...
... three gases, and use this datum with the volume to obtain the final density. 7. N H4 H S(s) dissociates according to the equation: N H4 H S(s)* ) N H3 (g) + H2 S(g) At a certain temperature, the dissociation pressure of the pure solid is 50 mm Hg. This represents the total pressure when N H4 HS(s) i ...
CC9 Word sheet
... When substances cannot enter or leave an observed environment, e.g. a stoppered test tube. ...
... When substances cannot enter or leave an observed environment, e.g. a stoppered test tube. ...
PowerPoint Template
... matter usually occurs as mixtures, such as air, seawater, soil, and organisms A heterogeneous mixture has one or more visible boundaries between the components Example: rocks A homogeneous mixture has no visible boundaries because the components are mixed as individual atoms, ions, and ...
... matter usually occurs as mixtures, such as air, seawater, soil, and organisms A heterogeneous mixture has one or more visible boundaries between the components Example: rocks A homogeneous mixture has no visible boundaries because the components are mixed as individual atoms, ions, and ...
CH100: Fundamentals for Chemistry
... Exact Numbers are numbers known with certainty Unlimited number of significant figures They are either counting numbers number of sides on a square ...
... Exact Numbers are numbers known with certainty Unlimited number of significant figures They are either counting numbers number of sides on a square ...
Final Exam Review 2010 UbD
... 16. What is the charge, location and mass of a proton? ___________________________________________ 17. What is the charge, location and mass of a neutron? __________________________________________ 18. What is the charge, location and mass of an electron? _________________________________________ 19 ...
... 16. What is the charge, location and mass of a proton? ___________________________________________ 17. What is the charge, location and mass of a neutron? __________________________________________ 18. What is the charge, location and mass of an electron? _________________________________________ 19 ...
Oxidation And Degradation Products Of Common Oxygen Scavengers
... During the search it became apparent that strong reducing agents (oxygen scavengers) should do more than react with and remove dissolved oxygen. They should also form protective oxide films on the metal surfaces of the steam/water system. Thus, the reaction with metal oxides is equally as important ...
... During the search it became apparent that strong reducing agents (oxygen scavengers) should do more than react with and remove dissolved oxygen. They should also form protective oxide films on the metal surfaces of the steam/water system. Thus, the reaction with metal oxides is equally as important ...
KEY + + - UIC Department of Chemistry
... 2. A reaction between an acid and a metal produces __________. (a) salt + water (b) salt + H2(g) (c) salt + CO2(g) (d) salt + CO2(g) + H 2 O 3. A compound was found to contain 54.5% carbon, 9.2% hydrogen, and 36.3% oxygen by mass. What is the empirical formula of the compound? (a) C6 HO4 (b) C4 H8 O ...
... 2. A reaction between an acid and a metal produces __________. (a) salt + water (b) salt + H2(g) (c) salt + CO2(g) (d) salt + CO2(g) + H 2 O 3. A compound was found to contain 54.5% carbon, 9.2% hydrogen, and 36.3% oxygen by mass. What is the empirical formula of the compound? (a) C6 HO4 (b) C4 H8 O ...
Calculations Booklet
... Radioactivity and Halflife Half-life is the time taken for half of a radioisotope to decay. This value is constant for that particular isotope. ...
... Radioactivity and Halflife Half-life is the time taken for half of a radioisotope to decay. This value is constant for that particular isotope. ...
The Atom - Effingham County Schools
... • Atoms are divisible into even smaller particles • A given element can have atoms with different masses Some important concepts remain unchanged • All matter is composed of atoms • Atoms of any one element differ in properties from atoms of another element ...
... • Atoms are divisible into even smaller particles • A given element can have atoms with different masses Some important concepts remain unchanged • All matter is composed of atoms • Atoms of any one element differ in properties from atoms of another element ...
Balancing Equations (A visual aid)
... I. Obtain a container of colored beads. If your container of beads does not have enough, get them from the reserve stockpile at the teacher’s desk. The numbers shown below are the minimum for you to be able to do the equation balancing. II. For equations (1) - (7) below, complete the following steps ...
... I. Obtain a container of colored beads. If your container of beads does not have enough, get them from the reserve stockpile at the teacher’s desk. The numbers shown below are the minimum for you to be able to do the equation balancing. II. For equations (1) - (7) below, complete the following steps ...
PPT: Chemical Reactions Review
... 2. Write separate half-reactions for the reduction/oxidation reactions. 3. Balance all the atoms EXCEPT O and H. 4. Balance the oxygen by adding water (H2O). 5. Balance the hydrogen by adding H+. 6. Balance the charge by adding electrons. 7. Multiply each half-reaction by an appropriate number to ma ...
... 2. Write separate half-reactions for the reduction/oxidation reactions. 3. Balance all the atoms EXCEPT O and H. 4. Balance the oxygen by adding water (H2O). 5. Balance the hydrogen by adding H+. 6. Balance the charge by adding electrons. 7. Multiply each half-reaction by an appropriate number to ma ...
What is an Enzym
... The role of enzymes as catalysts that lower the activation energy of biochemical reactions. Identify factors, such as pH and temperature, and their effect on enzyme activity. Appropriateness for Middle/High School Students Students will be able to observe a chemical reaction, identify the substrate ...
... The role of enzymes as catalysts that lower the activation energy of biochemical reactions. Identify factors, such as pH and temperature, and their effect on enzyme activity. Appropriateness for Middle/High School Students Students will be able to observe a chemical reaction, identify the substrate ...
Chapter 1 Matter on the Atomic Scale
... • Slightly larger, fixed volume than a solid. • More randomly arranged than a solid. • Constant collisions with neighbors. • Less confined, can move past each other. ...
... • Slightly larger, fixed volume than a solid. • More randomly arranged than a solid. • Constant collisions with neighbors. • Less confined, can move past each other. ...
thermochermistry ap - Mater Academy Lakes High School
... ΔH = Hfinal – Hinitial The relationship between energy and enthalpy is that ΔE = ΔH – PΔV o ΔE is almost equal to ΔH because PΔV is typically very small 5.4 Enthalpies of Reaction The enthalpy of a reaction, or heat of a reaction, can be found by ΔH = Hproducts – Hreactants ; ΔH can also be writ ...
... ΔH = Hfinal – Hinitial The relationship between energy and enthalpy is that ΔE = ΔH – PΔV o ΔE is almost equal to ΔH because PΔV is typically very small 5.4 Enthalpies of Reaction The enthalpy of a reaction, or heat of a reaction, can be found by ΔH = Hproducts – Hreactants ; ΔH can also be writ ...
Honors Midterm - Stamford High School
... 15. What is an isotope? Isotopes of an element have different numbers of neutrons, they also have different mass numbers 16) What are radioisotopes? Radioisotopes can be used to diagnose medical problems and, in some cases, to treat diseases. Background information:. How do you balance nuclear react ...
... 15. What is an isotope? Isotopes of an element have different numbers of neutrons, they also have different mass numbers 16) What are radioisotopes? Radioisotopes can be used to diagnose medical problems and, in some cases, to treat diseases. Background information:. How do you balance nuclear react ...
Turn in Homework to the front! 9/7 Warm Up
... Significant Figures give the reader an idea of how well you could actually measure/report your data. Rules for significant figures. 1) ALL non-zero numbers (1,2,3,4,5,6,7,8,9) are ALWAYS ...
... Significant Figures give the reader an idea of how well you could actually measure/report your data. Rules for significant figures. 1) ALL non-zero numbers (1,2,3,4,5,6,7,8,9) are ALWAYS ...
Writing And Balancing Equations
... Balance each element by placing whole numbers (coefficients) in front of each formula as needed ...
... Balance each element by placing whole numbers (coefficients) in front of each formula as needed ...
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.