Unit 1 science of chemistry
... Evidence of chemical change Production of gas (observed as bubbles or change of odor) Release or absorption of energy (change in temperature or giving off light) A color change Formation of a precipitate (solid formed when two clear solutions combine and become cloudy) Ex. Burning, diges ...
... Evidence of chemical change Production of gas (observed as bubbles or change of odor) Release or absorption of energy (change in temperature or giving off light) A color change Formation of a precipitate (solid formed when two clear solutions combine and become cloudy) Ex. Burning, diges ...
Chem 221 Quiz
... dispersion forces holding them together Methyl ether has polar bonds (2 C-O), but does not have a partial plus on hydrogen, only carbon. As a result, its strongest intermolecular force is dipole-dipole attractions. It has a lot of hydrogens, but cannot hydrogen bond because there aren’t any partial ...
... dispersion forces holding them together Methyl ether has polar bonds (2 C-O), but does not have a partial plus on hydrogen, only carbon. As a result, its strongest intermolecular force is dipole-dipole attractions. It has a lot of hydrogens, but cannot hydrogen bond because there aren’t any partial ...
H - JMap
... to bottom of the Periodic Table? (1) The number of principal energy levels increases, and the number of valence electrons increases. (2) The number of principal energy levels increases, and the number of valence electrons remains the same. (3) The number of principal energy levels remains the same, ...
... to bottom of the Periodic Table? (1) The number of principal energy levels increases, and the number of valence electrons increases. (2) The number of principal energy levels increases, and the number of valence electrons remains the same. (3) The number of principal energy levels remains the same, ...
Chapter 5
... can occur when atoms, ions, and molecules collide Activation energy is needed to disrupt electronic configurations Reaction rate is the frequency of collisions with enough energy to bring about a reaction. Reaction rate can be increased by enzymes or by increasing temperature or pressure ...
... can occur when atoms, ions, and molecules collide Activation energy is needed to disrupt electronic configurations Reaction rate is the frequency of collisions with enough energy to bring about a reaction. Reaction rate can be increased by enzymes or by increasing temperature or pressure ...
unit 4: chemical reaction rates
... Scientists discovered that by simply determining the mass of the substance, it was possible to count particles or atoms. A mole (mol) is the amount of a pure substance that contains the same amount of chemical units as there are atoms in exactly 12 grams of carbon, namely 12. In order to avoid confu ...
... Scientists discovered that by simply determining the mass of the substance, it was possible to count particles or atoms. A mole (mol) is the amount of a pure substance that contains the same amount of chemical units as there are atoms in exactly 12 grams of carbon, namely 12. In order to avoid confu ...
Chapter 5 ppt
... The arrow points towards the products formed by the reaction Individual products and reactants are separated by a plus sign Chemical Equation: A written statement using symbols and formulas to describe the changes that occur in a reaction Example: 2H2(g) + O2 (g) 2H2O (l) Letter in parentheses in ...
... The arrow points towards the products formed by the reaction Individual products and reactants are separated by a plus sign Chemical Equation: A written statement using symbols and formulas to describe the changes that occur in a reaction Example: 2H2(g) + O2 (g) 2H2O (l) Letter in parentheses in ...
+ 2 H2O(l Ca(OH)2 aq)
... c) 2 KMnO4(aq) + 3 Na2SO3(aq) + H2O(l) 2 MnO2(s) + 3 Na2SO4(aq) + 2 KOH(aq) KMnO4 is the oxidizing agent (O.N.(Mn) goes from +7 to +4). Na2SO3 is the reducing agent (O.N.(S) goes from +4 to +6). d) 2 CrO42–(aq) + 3 HSnO2–(aq) + H2O(l) 2 CrO2–(aq) + 3 HSnO3–(aq) + 2 OH–(aq) CrO42– is the oxidizin ...
... c) 2 KMnO4(aq) + 3 Na2SO3(aq) + H2O(l) 2 MnO2(s) + 3 Na2SO4(aq) + 2 KOH(aq) KMnO4 is the oxidizing agent (O.N.(Mn) goes from +7 to +4). Na2SO3 is the reducing agent (O.N.(S) goes from +4 to +6). d) 2 CrO42–(aq) + 3 HSnO2–(aq) + H2O(l) 2 CrO2–(aq) + 3 HSnO3–(aq) + 2 OH–(aq) CrO42– is the oxidizin ...
Chemical Reactions
... 9. Give the students the reaction and ask them to identify the element oxidized, the element reduced, the oxidizing reactant and the reducing reactant Observations: As the yeast combines with the sugar solution bubbling will occur. Let your students know that bubbling is a sign of a chemical reactio ...
... 9. Give the students the reaction and ask them to identify the element oxidized, the element reduced, the oxidizing reactant and the reducing reactant Observations: As the yeast combines with the sugar solution bubbling will occur. Let your students know that bubbling is a sign of a chemical reactio ...
Wizard Test Maker
... 5822 Which element is malleable and can conduct electricity in the solid phase? (1) iodine (3) sulfur (2) phosphorus (4) tin 5747 Which substance can not be decomposed by ordinary chemical means? (1) methane (3) ethanol (4) ammonia (2) mercury 5655 The elements located in the lower left corner of th ...
... 5822 Which element is malleable and can conduct electricity in the solid phase? (1) iodine (3) sulfur (2) phosphorus (4) tin 5747 Which substance can not be decomposed by ordinary chemical means? (1) methane (3) ethanol (4) ammonia (2) mercury 5655 The elements located in the lower left corner of th ...
Solving Equilibrium Problems
... Now, fill the table with all known concentrations These are the concentrations that are given in the problem Example - Suppose for the equilibrium reaction below, the initial concentrations of A and B were given as 0.750 M in A and 1.500 M in B The table will look as follows: aA I C E ...
... Now, fill the table with all known concentrations These are the concentrations that are given in the problem Example - Suppose for the equilibrium reaction below, the initial concentrations of A and B were given as 0.750 M in A and 1.500 M in B The table will look as follows: aA I C E ...
Gas review
... L of C2H4 measured at 21°C and 1.038 atm burns completely with O2, calculate the volume of CO2 produced assuming the CO2 is measured at 44°C and 0.989 atm. ...
... L of C2H4 measured at 21°C and 1.038 atm burns completely with O2, calculate the volume of CO2 produced assuming the CO2 is measured at 44°C and 0.989 atm. ...
Chapter 2 1
... b) the relative number of atoms of each element. c) how the atoms are connected to one another. Compounds do not necessarily have the same chemical properties as their elements. NaCl is the example usually given: Sodium is a shiny malleable metal which reduces water to give an explosive mixture of h ...
... b) the relative number of atoms of each element. c) how the atoms are connected to one another. Compounds do not necessarily have the same chemical properties as their elements. NaCl is the example usually given: Sodium is a shiny malleable metal which reduces water to give an explosive mixture of h ...
Chemistry
... Chapter 18 (electrochemistry) is not included on this Review Guide but will be on the Exam. Use the notes, handouts, homework, and textbook to review. It’s a short chapter and the topic we covered most recently, so it should be fresh in your mind. Chapter 8 – The Mole and Chemical Composition Topics ...
... Chapter 18 (electrochemistry) is not included on this Review Guide but will be on the Exam. Use the notes, handouts, homework, and textbook to review. It’s a short chapter and the topic we covered most recently, so it should be fresh in your mind. Chapter 8 – The Mole and Chemical Composition Topics ...
Unit 4 - cloudfront.net
... unless we change to renewable sources (such as: ____________________________________). 3. Coal is a complex organic material with ______________ as the primary element. It also contains H, O, N, and S. Complete combustion of carbon produces__________. a. Burning coal also produces CO and soot (unbur ...
... unless we change to renewable sources (such as: ____________________________________). 3. Coal is a complex organic material with ______________ as the primary element. It also contains H, O, N, and S. Complete combustion of carbon produces__________. a. Burning coal also produces CO and soot (unbur ...
Chemical formulae Worksheet
... Organic compounds are composed of carbon and hydrogen and sometimes a few other elements. Many organic compounds contain carbon, hydrogen, oxygen and/or nitogen. Organic compounds may be divided into hydrocarbons containing carbon and hydrogen(e.g. methane CH4, ethene, C2H4) and functionalised hydro ...
... Organic compounds are composed of carbon and hydrogen and sometimes a few other elements. Many organic compounds contain carbon, hydrogen, oxygen and/or nitogen. Organic compounds may be divided into hydrocarbons containing carbon and hydrogen(e.g. methane CH4, ethene, C2H4) and functionalised hydro ...
Chemical Equations and Reactions
... between substances that are dissolved in liquids. If a solid appears after two solutions are mixed, a reaction has likely occurred. A solid that is produced as a result of a chemical reaction in solution and that separates from the solution is known as a precipitate. A precipitateforming reaction is ...
... between substances that are dissolved in liquids. If a solid appears after two solutions are mixed, a reaction has likely occurred. A solid that is produced as a result of a chemical reaction in solution and that separates from the solution is known as a precipitate. A precipitateforming reaction is ...
Thermochemistry Review
... 44. When graphite and diamond burn, the reactions can be represented by the thermochemical equations: C(graphite) + O2(g) ¼ CO2(g) ∆H = –393 kJ ∆H = –395 kJ C(diamond) + O2(g) ¼ CO2(g) If 1.0 mol of graphite is converted into 1.0 mol of diamond under the same conditions, what is the heat energy chan ...
... 44. When graphite and diamond burn, the reactions can be represented by the thermochemical equations: C(graphite) + O2(g) ¼ CO2(g) ∆H = –393 kJ ∆H = –395 kJ C(diamond) + O2(g) ¼ CO2(g) If 1.0 mol of graphite is converted into 1.0 mol of diamond under the same conditions, what is the heat energy chan ...
CHEMICAL FORMULAE AND EQUATIONS Molecule Empirical
... Organic compounds are composed of carbon and hydrogen and sometimes a few other elements. Many organic compounds contain carbon, hydrogen, oxygen and/or nitogen. Organic compounds may be divided into hydrocarbons containing carbon and hydrogen(e.g. methane CH4, ethene, C2H4) and functionalised hydro ...
... Organic compounds are composed of carbon and hydrogen and sometimes a few other elements. Many organic compounds contain carbon, hydrogen, oxygen and/or nitogen. Organic compounds may be divided into hydrocarbons containing carbon and hydrogen(e.g. methane CH4, ethene, C2H4) and functionalised hydro ...
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.