CHEM 121 UNR FINAL EXAM WITH CORRECT QUESTIONS AND ANSWERS 2025

CHEM 121 UNR FINAL EXAM WITH
CORRECT QUESTIONS AND ANSWERS
2025

Homogenous Mixture - CORRECT-ANSWERSmixture same throughout EX) Air


Heterogenous Mixture - CORRECT-ANSWERSMixture different throughout EX) Smoke


Density= - CORRECT-ANSWERSMass(g)/Volume(l)


Filtration - CORRECT-ANSWERSUsed to sperate a hetro mixture


Distillation - CORRECT-ANSWERSfrom Homo Mixture, Use boiling points


Kilo - CORRECT-ANSWERS1x10^3


Centi - CORRECT-ANSWERS1x10^-2


Mili - CORRECT-ANSWERS1x10^-3


Micro - CORRECT-ANSWERS1x10^-6


Nano - CORRECT-ANSWERS1x10^9


Pico - CORRECT-ANSWERS1x10^-12


Add or Subtract = - CORRECT-ANSWERSnumber of decimal places


multiply or divide = - CORRECT-ANSWERSnumber of sig figs


Never a sig fig - CORRECT-ANSWERS0's at the beginning of a number

, 0's between 2 sig fig - CORRECT-ANSWERSAre significant


all non zero - CORRECT-ANSWERSare significant


0's at the end, when decimal place is present - CORRECT-ANSWERSare significant


Law of conservation of mass - CORRECT-ANSWERSmatter cannot be created or


destroyed


law of constant composition - CORRECT-ANSWERSrelative proportions of mass are the


same


Ernest Ruthford's Experiment - CORRECT-ANSWERSshot particles at a relevance:


discovered positively charged particles, the Nucleus


Atomic Number - CORRECT-ANSWERSTop number on Element, Number of Protons


Number Below Element Symbol - CORRECT-ANSWERSAtomic Weight


Isotope - CORRECT-ANSWERSsame number of protons different number or neutrons


Ion - CORRECT-ANSWERSsame number of protons different number of electrons


Group 1 - CORRECT-ANSWERSalkaline metals


group 2 - CORRECT-ANSWERSalkali earth metals


group 16 - CORRECT-ANSWERSchalogens


group 17 - CORRECT-ANSWERShalogens