Mass-Mass Stoichiometry
... Gases and Gas Laws 35. What four variables affect the behavior of a gas? 36. Know the relationships (direct or inverse) between each pair of the four variables 37. What’s the molar mass of the following: a. O2 b. CO2 c. Rn d. Fe(NO3)3 e. Al2(SO4)3 38. How many moles are in a 45.0 L sample of O2 at S ...
... Gases and Gas Laws 35. What four variables affect the behavior of a gas? 36. Know the relationships (direct or inverse) between each pair of the four variables 37. What’s the molar mass of the following: a. O2 b. CO2 c. Rn d. Fe(NO3)3 e. Al2(SO4)3 38. How many moles are in a 45.0 L sample of O2 at S ...
Types of Chemical Reactions (rxns.)
... Combustion reactions occur when a hydrocarbon reacts with oxygen gas. This is also called burning!!! In order to burn something you need the 3 things in the “fire triangle”: 1) A Fuel (hydrocarbon) 2) Oxygen to burn it with 3) Something to ignite the reaction (spark) ...
... Combustion reactions occur when a hydrocarbon reacts with oxygen gas. This is also called burning!!! In order to burn something you need the 3 things in the “fire triangle”: 1) A Fuel (hydrocarbon) 2) Oxygen to burn it with 3) Something to ignite the reaction (spark) ...
Chemical Reactions - Northside Middle School
... Count the number of atoms of each type appearing on both sides Balance the elements one at a time by adding coefficients (the numbers in front) - save H and O until LAST! Check to make sure it is balanced. ...
... Count the number of atoms of each type appearing on both sides Balance the elements one at a time by adding coefficients (the numbers in front) - save H and O until LAST! Check to make sure it is balanced. ...
200 Ways to Pass the Chemistry - Home 15-16
... Dimercury (I) nitrate ………. 50. Roman numerals are used to show the positive oxidation number of the cation if it has more than one positive oxidation number FeO: ……………………. Nickel (III) sulfate: …………….. 51. Physical changes do not form new substances. They merely change the appearance of the original ...
... Dimercury (I) nitrate ………. 50. Roman numerals are used to show the positive oxidation number of the cation if it has more than one positive oxidation number FeO: ……………………. Nickel (III) sulfate: …………….. 51. Physical changes do not form new substances. They merely change the appearance of the original ...
The Chemical Basis of Life
... have the same number of protons, but have different numbers of neutrons. Radioisotopes – radioactive decay The time it takes for half of a radioactive substance to decay is called its half-life. ...
... have the same number of protons, but have different numbers of neutrons. Radioisotopes – radioactive decay The time it takes for half of a radioactive substance to decay is called its half-life. ...
Masterton and Hurley Chapter 4
... • Masses are additive; volumes are not • The total mass of a solution is the sum of the mass of the solute and the solvent • The total volume of a solution is not the sum of the volumes of the solute and solvent • Molarity as a conversion: Use: # moles = 1 Liter ...
... • Masses are additive; volumes are not • The total mass of a solution is the sum of the mass of the solute and the solvent • The total volume of a solution is not the sum of the volumes of the solute and solvent • Molarity as a conversion: Use: # moles = 1 Liter ...
examples of chemical and physical reactions.
... 1. Chemical reactions make new materials. They are irreversible changes. Which are chemical reactions and which are physical changes. a) lighting a Bunsen burner _________________ b) salt disappearing as it is stirred into a beaker of water ___________ c) water droplets forming on a kitchen window _ ...
... 1. Chemical reactions make new materials. They are irreversible changes. Which are chemical reactions and which are physical changes. a) lighting a Bunsen burner _________________ b) salt disappearing as it is stirred into a beaker of water ___________ c) water droplets forming on a kitchen window _ ...
Types of Chemical Reactions
... can get into a crazy never ending loop. (But, if oxygen is odd, try to make them not odd at the start). 2) If a polyatomic ion exists on both sides of the equation you can keep it together if ...
... can get into a crazy never ending loop. (But, if oxygen is odd, try to make them not odd at the start). 2) If a polyatomic ion exists on both sides of the equation you can keep it together if ...
Oxidation-Reduction Reactions Oxidation-Reduction
... Suppose a 1.00 L sample of polluted water was analyzed for lead(II) ion, Pb2+, by adding an excess of sodium sulfate to it. The mass of lead(II) sulfate that precipitated was 229.8 mg. What is the mass of lead in a liter of the water? Express the answer as mg of lead per liter of solution. ...
... Suppose a 1.00 L sample of polluted water was analyzed for lead(II) ion, Pb2+, by adding an excess of sodium sulfate to it. The mass of lead(II) sulfate that precipitated was 229.8 mg. What is the mass of lead in a liter of the water? Express the answer as mg of lead per liter of solution. ...
Rates of Reaction: Chemical Kinetics 50
... A. increases as temperature decreases. B. decreases when a catalyst is added. C. increases as reactant concentration increases. D. decreases as reactant concentration increases. ...
... A. increases as temperature decreases. B. decreases when a catalyst is added. C. increases as reactant concentration increases. D. decreases as reactant concentration increases. ...
Honors Chemistry
... 5. What are significant figures? How many SF are in 4.500060 cm? 0.0036030 ft? 3.980200 x 1017 mm? 6. What is the rule for SF in calculations such as multiplication, division, addition and subtraction? What is 0.760 cm + 367.8 cm? What is 609 g / 1020 mL? 7. What is the density of a 7.9 lb rock that ...
... 5. What are significant figures? How many SF are in 4.500060 cm? 0.0036030 ft? 3.980200 x 1017 mm? 6. What is the rule for SF in calculations such as multiplication, division, addition and subtraction? What is 0.760 cm + 367.8 cm? What is 609 g / 1020 mL? 7. What is the density of a 7.9 lb rock that ...
Gas Stoichiometry Worksheet
... Ammonium sulfate, an important fertilizer, can be prepared by the reaction of ammonia with sulfuric acid according to the following balanced equation: 2 NH3 (g) + H2SO4 → (NH4)2SO4 (aq) Calculate the volume of NH3 (in liters) needed at 20ºC and 25.0 atm to react with 150 kg of H2SO4. ...
... Ammonium sulfate, an important fertilizer, can be prepared by the reaction of ammonia with sulfuric acid according to the following balanced equation: 2 NH3 (g) + H2SO4 → (NH4)2SO4 (aq) Calculate the volume of NH3 (in liters) needed at 20ºC and 25.0 atm to react with 150 kg of H2SO4. ...
NSCC Chem 121 chapter5
... • The amounts of product calculated in the last three examples are not the amounts that would be produced if the reactions were actually done in the laboratory. • In each case, less product would be obtained than was calculated. There are numerous causes. Some materials are lost during transfers fro ...
... • The amounts of product calculated in the last three examples are not the amounts that would be produced if the reactions were actually done in the laboratory. • In each case, less product would be obtained than was calculated. There are numerous causes. Some materials are lost during transfers fro ...
AP Chemistry Note Outline
... 6. Cancel out any extra water and OH7. Balance Charge with e8. Multiply reactions by factors such that the e- cancel Add both ½ reactions ...
... 6. Cancel out any extra water and OH7. Balance Charge with e8. Multiply reactions by factors such that the e- cancel Add both ½ reactions ...
Conservation of Energy in chemical reactions, Hess`s Law
... (By the way, notice the presence of the sign, °, on the enthalpy. This indicates that the reaction is happening under standard conditions.) ...
... (By the way, notice the presence of the sign, °, on the enthalpy. This indicates that the reaction is happening under standard conditions.) ...
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.