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CHEM 104 Final Exam (Hill) | Questions & Answers (100 %Score) Latest Updated 2024/2025 Comprehensive Questions A+ Graded Answers | With Expert Solutions $13.48   Add to cart

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CHEM 104 Final Exam (Hill) | Questions & Answers (100 %Score) Latest Updated 2024/2025 Comprehensive Questions A+ Graded Answers | With Expert Solutions

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CHEM 104 Final Exam (Hill) | Questions & Answers (100 %Score) Latest Updated 2024/2025 Comprehensive Questions A+ Graded Answers | With Expert Solutions

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  • August 7, 2024
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CHEM 104 Final Exam (Hill) | Questions & Answers (100 %Score) Latest Updated
2024/2025 Comprehensive Questions A+ Graded Answers | With Expert Solutions


Is air a mixture or a pure substance? - Mixture



Mixture - a physical combination of two or more substances present in variable amounts



Composition of Air - 78% Nitrogen, 21% Oxygen, 1% Argon and CO2



Air Particles unchanged by respiration? - Nitrogen and Argon



Air Particles changed by respiration? - Oxygen and CO2



Name 5 kinds of Air Pollutants - Carbon Monoxide, Ozone, Sulfur Dioxide, Nitrogen Dioxide, Particulate
Matter (dust, sand)



Ozone Molecule - O3



Ozone Pollutant - Smelly gas that can cause breathing problems



Air Quality Index - Scale that ranks levels of ozone and other air pollutants (0-500) 500=high



Air Quality index for Healthy-Moderate Air - 0-100



Atom - Smallest particle of an element



Molecule - A group of atoms bonded together



Classification of pure substances - Elements and Compounds

,Compounds - 2 or more elements chemically combined; Completely the same chemical combination
throughout



Elements - A molecule composed of one kind of atom; cannot be broken into simpler units by chemical
reactions



Inventor of Periodic Table - Mendeleev



What does an element's group tell us? - Group is the vertical column. Tells us how many valence
electrons are in the outer shell; tells us how reactive the element is



Hydrocarbons - Organic molecules consisting of only carbon and hydrogen. Have different prefixes than
other molecules used for fuels



Pneumonic for Hydrocarbon prefixed - Mother Eats Peanut Butter



Methane, Ethane, Propane, Cyclopropane



Combustion - Rapid reaction between oxygen and fuel that results in heat and light



PPH to PPM conversion - Move decimal four places to the right



Types of Mixtures - Heterogenous and Homogenous



Heterogenous Mixture - Mixture with uneven distribution of different substances; not the same
throughout



Homogenous Mixture - Mixture in which the composition is uniform throughout

, What do periods mean on the Periodic Table? - How many valence shells there are



Protons - Positively charged particles inside nucleus



Neutrons - Neutrally charged particles inside nucleus



Electrons - Negatively charged particles outside nucleus



To be electronically stable, an atom must have an equal number of ___ and ___ - Protons and Neutrons



What does the Atomic number tell you? - Number of protons in the nucleus. Always equal to the
number of electrons (if stable)



Alkali Metals Properties - Highly reactive metals



Halogens Properties - Reactive non-metals



Noble Gases Properties - Un-reactive nonmetals



Isotope - Atoms of the same element that have different numbers of neutrons



Mass Number - Sum of the number of neutrons and protons in an atomic nucleus; tells you the isotopes



How to get number of neutrons using the Periodic Table? - Subtract atomic number from the mass
number



Valence Electrons - The electrons in the outermost shell of an atom; these are the electrons involved in
forming bonds



Covalent Bond - sharing a pair of electrons between atoms

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