Glendale Community College

Consider a neutral atom with 30 protons and 34 neutrons. The number of electrons in this atom is? A. 30 B. 32 C. 34 D. 64 E. 94 - Answer A. 30 Identify the noble gas in the following list. A. oxygen B. Helium C. Chlorine D. Gold E. Nitrogen - Answer B. Helium The formation of a gas resulting from the escape of high-energy particles from the surface of a liquid is known as. A. deposition B. evaporation C. melting D. Boiling E. sublimation - Answer B....

What type of spectrum is emitted by gaseous discharge tubes? - Answer A discontinuous spectrum White light from the sun emits what type of spectrum? - Answer A continuous spectrum from red to violet How are photons emitted in discharge tubes? - Answer As the excited atom returns to a lower energy state, photons are emitted What are 3 common applications of light emission by elements? - Answer 1) The flame test 2) Fireworks 3) Office fluorecent lights The spe...

chemistry - Answer the study of matter and the changes it undergoes scientific method - Answer a systematic approach to research qualitative data - Answer general observations quantitative data - Answer comprising of numbers obtained by measurement hypothesis - Answer a tentative explanation for a set of observations law - Answer a mathematical relationship that is consistently found to be true theory - Answer a general principle or bod...

When should you NOT wear gloves in the lab setting? a. When weighing our reagents at the balances b. When entering in data on your laptop c. When handling clean glassware d. When writing notes on scratch paper using a pen and paper - Answer b and d *also should not wear gloves when opening doors General glove rules - Answer - you should never reuse gloves - dispose of gloves if they are heavily contaminated - dispose of gloves if they are torn - dispose of gloves in the g...

Addition and Subtraction sidings - Answer smallest number of digits right of decimal point, make powers the same Multiplication and Division sidings - Answer smallest number of digits total Logarithms (ex: pH) sidings - Answer number of digits right of pH decimal point, any logarithms must have at least one decimal point (pH = 4 --> 4.0) Mixed Operations sidings - Answer take correct sidings before continuing to next step (email about this) Flammable - Answ...

Energy of the Electron - Answer E= (-kZ^2)/n^2 z=Atomic number Difference in electron energy - Answer E1-E2 Larger core charge - Answer Larger 1s energy Ionization Energy is equal to Coulombic Potential Energy - Answer IE=V=(kq1q2)/d Total Potential Energy - Answer V1+V2+V3 Calculate Core Charge - Answer Atomic #- # inner electrons Core Charge Trends - Answer Increases going left to right across a period Same going down a group Cov...

Law of Conservation of Mass: - Answer there is no change in the total mass of the substances reacting in a balanced chemical reaction; thus, no material is lost or gained as original substances are changed to new substances Theoretical Yield: - Answer amount of product (100%) we would expect if all the reactants were converted to the desired product Actual Yield: - Answer the measure of mass of the product when a reaction ends Percent Yield: - Answer (actual yiel...

Lewis structures? - Answer used to diagram the sharing of valence electrons for single & multiple bonds in molecules Generally, a solution of an organic compound in water will be electrically.... charged nonconductive highly ionized insulated highly conductive. - Answer nonconductive What bonds in an organic compound? - Answer C atoms primarily form with H atoms and other C atoms. But ALWAYS contain C and H Other elements commonly found in organic compounds... -...

what is chemistry? - Answer the study of matter hypothesis - Answer a tentative explanation for a single or small number of observations. can be validated or invalidated by experiments. law - Answer a brief statement that summarizes many past observations and predicts future ones. can be validated or invalidated by experiments (laws don't explain why but summarize with a statement) theory - Answer also called model. a broad and deep explanation for a large num...

Chemical Reactions - Answer the organization of atoms in one or more substances the bonds are broken and formed, with the same number of atoms on each side of the arrow stoichiometry - Answer a mathematical means of getting from one unit to another (utilizing a chemical equation) dependent on: nature of the reaction - the exact nature of the chemicals when dissolved -amount of chemicals present- molarity stoichiometric mixture - Answer one that possesses equivalent ...