CHEM 1211 TEST 3 QUESTIONS WITH VERIFIED SOLUTIONS LATEST UPDATE 2026

CHEM 1211 TEST 3 QUESTIONS WITH VERIFIED SOLUTIONS LATEST UPDATE 2026 Reaction of a chemical species with molecular oxygen that produces energy in the form of heat and light. - Answers combustion reaction Energy needed to vaporize 1 gram or 1 mole of that substance - Answers heat of vaporization When measured at a constant pressure, the energy released is the - Answers enthalpy change for a reaction What type of variable is dependent on the amount of substance present? - Answers extensive variable Experiments that measure heat exchange - Answers calorimetry Measurement device for calorimetry - Answers calorimeter Constant-pressure calorimetry - Answers coffee cup calorimetry Constant-volume calorimetry - Answers bomb calorimetry coffee cup calorimetry equation - Answers q surroundings= (mass of calorimeter contents)(specific heat of solution)(change in temperature) DeltaH = q system = -q surroundings In coffee cup calorimetry if.. q surroundings = + and q system = - , what type of reaction is it? - Answers exothermic IN coffee cup calorimetry, if... q surroundings = - and q system = +, what type of reaction is it? - Answers endothermic Amount of energy as heat involved in the process of solution formation - Answers enthalpy of dissolution Enthalpy of dissolution equation - Answers q dissolution/ mols of whatever bomb calorimetry equation - Answers 0 = q reaction + q bomb + q water Type of function whose value for a system depends only on the current state of the system and not its history - Answers state function Law stating that if a chemical reaction can be expressed as the sum of two or more chemical reactions, the enthalpy change for the net reaction is equal to the sum of the enthalpy changes for the individual steps - Answers Hess's Law ________________ _______________ conditions for enthalpy values: -gases, liquids and solids in their pure form at a pressure of 1 barr at a specified temperature. -solutions with concentrations of 1 mol/L at a specified temperature - Answers standard state Enthalpy change for the formation of one mole of a species from its constituent elements in their most stable form - Answers standard heat of formation Enthalpy change for a reaction under standard conditions - Answers standard enthalpy of reaction DeltaH rxn equation - Answers Sum of DeltaH formation products - sum of DeltaH formation reactants Energy that travels through space as a wave - Answers electromagnetic radiation Distance between two consecutive peaks or troughs in a wave - Answers wavelength Number of consecutive waves that pass a point in space in a given amount of time - Answers frequency Maximum positive displacement from the medium to the top of a crest of a wave - Answers amplitude Speed at which all electromagnetic radiation travels in a vacuum - Answers speed of light speed of light constant - Answers 2.998x10^8 Equation relating c, wavelength, and frequency - Answers c = wavelength x frequency Shows the different types of electromagnetic radiation arranged by wavelength - Answers electromagnetic spectrum Order of electromagnetic spectrum from large frequency to small frequency - Answers gamma rays, x rays, far UV, near UV, visible, near infrared, far infrared, microwaves, radio waves Exhibited when light is shone on a metal and electrons are ejected from the surface of the metal - Answers photoelectric effect packets of traveling light - Answers photons Equation for energy of a photon - Answers Photon = h x frequency Value of Planck's constant - Answers 6.626x10-34 White light separated into a band showing the colors of the rainbow - Answers continuous spectrum Observation showing only very specific wavelengths of light - Answers line spectrum What is a large field of chemistry that revolves around the need to analyze samples to determine the nature and amount of chemical species present? - Answers chemical analysis What is the number to each energy level? - Answers principal quantum number Electron in lowest energy level - Answers ground state Most common technique used to determine the chemical formula of a compound containing carbon and hydrogen - Answers combustion analysis Where does an electron move when it absorbs energy? - Answers excited state Ability to do work - Answers energy Force involved in moving an object some distance - Answers work Study of how energy in the from of heat is involved in chemical change - Answers thermochemistry Energy associated with motion - Answers kinetic energy Energy associated with position - Answers potential energy Sum of kinetic and potential energy of an object as a whole - Answers mechanical energy Sum of the kinetic and potential energies of all the atoms, molecules, or ions within a system - Answers thermal energy Form of potential energy that can be released when new chemical bonds are formed - Answers chemical energy 1/2 mv^2 - Answers kinetic energy Study of relationships between heat, energy, and work, and the conversion of one into the other - Answers thermodynamics