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Chem 120 EXAM 1-Questions with Correct Answers/ Verified/ Latest Update (2024/2025)
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Chem 120 EXAM 1-Questions with Correct Answers/ Verified/ Latest Update (2024/2025)
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Chem 120 EXAM 1-Questions with Correct Answers/ Verified/Latest Update (2024/2025)
Fahrenheit to Celsius Equation - ✔✔C=(F-32)/1.8
Celsius to Fahrenheit Equation - ✔✔F=1.8C+32
Celsius to Kelvin Equation - ✔✔C=K-273.15
Kelvin to Celsius Equation - ✔✔K=C+273.15
Rutherford - ✔✔-Nuclear Theory of the Atom
- Directed Alpha particles at a thin sheet of gold and observed they did not go straight
through as expected
-Principles
1: Most of atom's mass is in nucleus
2:All positive charges are in nucleus
3: Majority of atom's volume is empty space
4: Positive and negative charges (protons and
electrons) should be equal to make atom charge
neutral
Charge of Gold (Au) - ✔✔Au+
Charge of Al - ✔✔Al3+
Charge of Zn - ✔✔Zn(2+)
Charge of Hg - ✔✔-Hg2+
-Hg is always Hg2
, Dmitri Mendeleev - ✔✔-Organized elements in order of increasing mass L ->R
-Aligned elements with similar properties into columns
-Set basis for periodic table
-Currently organized L->R by increasing Atomic #
Bohr - ✔✔-Bohr Model- Electrons orbit the nucleus
-Studied Prisms and spectrums
-Saw only 4 colors instead of a spectrum which would have implied electrons were free
floating
Transition Elements - ✔✔-Elements in middle of Periodic Table (3B-2B)
Main Group Elements - ✔✔-In Columns labeled with a # and an A (eg. 2A)
-Columns belong to names families/groups (eg. alkali metals, alkaline earth metals,
Halogens, Noble gases)
Chlorate - ✔✔ClO3 (-)
Ammonium - ✔✔NH4 (+)
Hydroxide - ✔✔OH (-)
Bi-Carbonate - ✔✔HCO3 (-)
Ammonia - ✔✔NH3
Nitrate - ✔✔NO4 (2-)
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