ACS General Chemistry First Term Final 38 Questions with Verified Answers,100% CORRECT

ACS General Chemistry First Term Final 38 Questions with Verified Answers Temp Conversions: Kelvin - CORRECT ANSWER K= C°+273.15 Farenheit - CORRECT ANSWER F°= 9/5(C°)+32 Celsius - CORRECT ANSWER C°= (F°-32) 5/9 Significant Figure Rules - CORRECT ANSWER 1. Leading zeros not sig 2. Zeros btw 2 digits are sig 3. Trailing zeros to right of decimal are sig 4. Trailing zeros before decimal are sig How many sig figs? 0.0005004 - CORRECT ANSWER 4 sig figs How many sig figs? 74,000 - CORRECT ANSWER 2 sig figs How many sig figs? 103.500 - CORRECT ANSWER 6 sig figs How many sig figs? 1.90️10^2 - CORRECT ANSWER 3 sig figs Unit Conversions 1 kilogram = grams? 1 meter = centimeters? 1 kilometer = meters? 1 Liter = milliliters? - CORRECT ANSWER 1000 grams or 10^3 100 centimeters 1000 meters 1000 milliliters Chemical Properties - CORRECT ANSWER Characteristic that cannot be observed without altering the substance ex. burning paper Physical Properies - CORRECT ANSWER Those that we can measure without changing the basic identiy of substance ex. color: blue, red Chemical Process - CORRECT ANSWER a process in which the identity of matter changes Physical Process - CORRECT ANSWER A transformation of a sample of matter, such as a change in physical state, that does not alter the chemical identity of any substance in the sample Random Error - CORRECT ANSWER Error that is due to chance and is not standardized. Decreases precision. Systematic Error - CORRECT ANSWER Error that shifts all measurements in a standardized way. Decreases accuracy Pure substances - CORRECT ANSWER elements(Na) and compounds(NaCl) Mixtures - CORRECT ANSWER A combination of two or more substances that are not chemically combined - Homogeneous- (same) salt+water - Heterogeneous- (diff) salt+sand Who's gold foil experiment discovered the nucleus? - CORRECT ANSWER Rutherford Standard Deviation Formula - CORRECT ANSWER Subatomic particles of atoms - CORRECT ANSWER Electron-, protons+, neutrons 0 Mass # = - CORRECT ANSWER # of protons + # of neutrons Atomic # = - CORRECT ANSWER # of protons - protons and e- are equal if no charge on the atom Isotopes - CORRECT ANSWER differ in # of neutrons Radioactive Isotopes - CORRECT ANSWER unstable and lose neutrons Beta particles - CORRECT ANSWER a negatively charged particle (an electron) emitted from the nucleus of an atom during radioactive decay Alpha particles - CORRECT ANSWER 2 protons and 2 neutrons, positively charged Y gamma rays - CORRECT ANSWER high energy, no mass Periods of the periodic table - CORRECT ANSWER horizontal rows Groups of the periodic table - CORRECT ANSWER vertical columns Metals - CORRECT ANSWER conduct electricity, malleable ex: Lithium Non-metals - CORRECT ANSWER Low conductivity, not ductile, not malleable, brittle, dull, gas at room temp ex: oxygen Metalloids (semimetals) - CORRECT ANSWER elements that have physical and chemical properties of both metals and nonmetals ex: silicon Ions - CORRECT ANSWER positively and negatively charged atoms Cation - CORRECT ANSWER A positively charged ion Anion - CORRECT ANSWER A negatively charged ion Electron Affinity - CORRECT ANSWER the energy needed to remove an electron from a negative ion to form a neutral atom or molecule - energy needed increases when you go up and along the periodic table ^ Ionization Energy - CORRECT ANSWER The amount of energy required to remove an electron from an atom ^ Properties of Light - CORRECT ANSWER