CHEM 121 FINAL EXAM QUESTIONS WITH VERIFIED ACCURATE ANSWERS || ALREADY GRADED A+ < 2024 UPDATED VERSION >
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Course
CHEM 121
Institution
CHEM 121
CHEM 121 FINAL EXAM QUESTIONS
WITH VERIFIED ACCURATE ANSWERS
|| ALREADY GRADED A+ < 2024
UPDATED VERSION >
1. What is the percentage of oxygen, by mass, in calcium phosphate? - ANSWER 41.3%
2. How many number of moles are present in 200. g of sodium
bicarbonate (NaHC...
CHEM 121 FINAL EXAM QUESTIONS
WITH VERIFIED ACCURATE ANSWERS
|| ALREADY GRADED A+ < 2024
UPDATED VERSION >
1. What is the percentage of oxygen, by mass, in calcium phosphate?
- ANSWER ✔ 41.3%
2. How many number of moles are present in 200. g of sodium
bicarbonate (NaHCO3)? - ANSWER ✔ 2.38 mole
3. What is the molecular formula for a compound with an empirical
formula of CH2O if its experimentally determined molecular
weight is 180 amu? - ANSWER ✔ C6H12O6
4. Give the empirical formula of the following compound if a sample
contains 0.0130 molC, 0.0390 molH, and 0.0065 molO. -
ANSWER ✔ C2H6O
5. Give the empirical formula of the following compound if a sample
contains 11.66 g iron and 5.01 g oxygen. - ANSWER ✔ Fe2O3
6. Give the empirical formula of the following compound if a sample
contains 40.0% C, 6.7% H, and 53.3% O by mass. - ANSWER ✔
CH2O
7. What is the empirical formula for valproic acid? - ANSWER ✔
C4H8O
, 8. If the molar mass is 144 g/mol, what is the molecular formula? -
ANSWER ✔ C8H16O2
9. What is the maximum number of moles H2 that can be produced
by the reaction of 3.00 mol of Ni with 4.50 mol of HCl according
to the equation: Ni + 2HCl → NiCl2 + H2 - ANSWER ✔ 2.25 mol
Chemistry - ANSWER ✔ The study of the properties of matter and
how matter changes
Matter - ANSWER ✔ Anything that has mass and takes up space
Nanoscale - ANSWER ✔ 1000 times smaller than the microscale
Scientific Notation - ANSWER ✔ A method of writing or displaying
numbers in terms of a decimal number between 1 and 10 multiplied by a
power of 10.
International System of Units - ANSWER ✔ Mega, M (10^6)
Kilo, k (10^3)
Deci, d (10^-1)
Centi, c (10^-2)
Milli, m (10^-3)
Micro, µ (10^-6)
Nano, n (10^-9)
Pico, p (10^-12)
By volume conversion - ANSWER ✔ (mL or L of liquid) / (mL or L
solution)
By mass conversion - ANSWER ✔ (mass of part) / (100 g of whole)
,Kinetic Molecular Theory - ANSWER ✔ All matter consists of tiny
particles that are in constant motion
As temperature increases, the motion of the particles increase
Fundmental Particle - ANSWER ✔ The smallest piece of a substance,
that is still represents the substance
Atom - ANSWER ✔ Fundamental particle that is unattached to other
atoms
Molecule - ANSWER ✔ When two atoms are chemically bound
Element - ANSWER ✔ Fundamental particle that only contains only
one kind of atom
Compound - ANSWER ✔ Fundamental particle is a combination of two
or more different kinds of atoms
Pure Substance - ANSWER ✔ All fundamental particles are the same
with fixed composition and properties
Mixture - ANSWER ✔ Contains two or more fundamental with varied
composition and properties
Heterogenous Mixture - ANSWER ✔ Type of mixture with properties
and composition that varies from point to point
Homogenous Mixture - ANSWER ✔ Type of mixture with properties
and composition that is uniform throughout
Physical Property - ANSWER ✔ Can be measured using the naked eye
, ex. Mass, volume, phase, shape, melting point, boiling point, density,
color
Density - ANSWER ✔ (mass) / (volume)
1 mL = 1 cm^3
Physical Change - ANSWER ✔ Changes to shape or state that does not
alter the chemical identity of a substance
Chemical Property - ANSWER ✔ Explanations for how chemical
changes happen to a substance based on contact with other matter or
energy
Chemical Changes - ANSWER ✔ Changes that alter the fundamental
particles of a substance
Reactant - ANSWER ✔ The starting substance(s) in a chemical
reactions
Product - ANSWER ✔ The ending substance(s) in a chemical reactions
Characteristics of Nonmetals - ANSWER ✔ Come in physical states
Do not conduct electricity
Forms molecules (diatomic molecules)
Characteristics of Metalloids - ANSWER ✔ Shiny semiconductors
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