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Uc Davis ; Chem Placement Questions And Answers Latest Update 2024/2025
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Uc Davis ; Chem Placement Questions And Answers Latest Update 2024/2025
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Uc Davis ; Chem Placement Questions AndAnswers Latest Update 2024/2025
scientific notation rules Answer: - if the number is positive, the decimal moves to the right.
e.g.: 6.66 x 10^-6 = 0.00000666
- if the number is negative, the decimal moves to the left.
e.g.: 6.66 x 10^6 = 6660000
unit conversion calculations Answer: - metric system acronym: KHDUDCM ;
> kilo (10^3)
> hecto (10^2)
> deca (10)
> unit (1)
> deci (10^-1)
> centi (10^-2)
> milli (10^-3)
density calculations Answer: - density = mass/volume ; d = m/v
- when doing stoich, remember to use the correct units
percent mass calculations Answer: mass percent tells you the percentage of each element that
makes up the compound.
- mass % = (mass of chemical/total mass of compound) x 100
> in grams
solving for mass when not given masses ;
, - mass % = (molar mass of element/total molecular mass of compound) x 100
> in (g/mol)
> find molar masses in periodic table!
reading and balancing chemical formulas Answer: - subscripts of formulas may not be changed; only
allowed to change coefficients ;
1. write out number of atoms below each side of equation
e.g.: __C4H10 + __O2 → __CO2 + __H2O
C=4C=1
H = 10 H = 2
O=2O=3
2. then, toy with the coefficients until the numbers balance on each side.*
e.g.: 2 C4H10 + 13 O2 → 8 CO2 + 10 H2O
C=8C=8
H = 20 H = 20
O = 26 O = 26
*you can simplify if all coefficients have a common divisor that produces whole numbers.
types of reactions Answer: - synthesis: two or more chemicals combine to form a more complex
product.
> A + B → AB
- decomposition: a compound is broken down into smaller chemical species
> AB → A + B
- single replacement: one element is displaced from a compound by another element
> A + BC → AC + B
- double replacement: two compounds exchange bonds or ions in order to form different compounds
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