CHEM 104 Final Exam (Hill); Questions and Answers 100% Solved
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Course
Chem 104
Institution
Chem 104
CHEM 104 Final Exam (Hill); Questions and
Answers 100% Solved
Is air a mixture or a pure substance? Correct answer-Mixture
Mixture Correct answer-a physical combination of two or more substances present in
variable amounts
Composition of Air Correct answer-78% Nitrogen, 21% Oxygen, 1% Argon ...
CHEM 104 Final Exam (Hill) ; Questions and Answers 100% Solved Is air a mixture or a pure substance? Correct answer -Mixture Mixture Correct answer -a physical combination of two or more substances present in variable amounts Composition of Air Correct answer -78% Nitrogen, 21% Oxygen, 1% Argon and CO2 Air Particles unchanged by respiration? Correct answer -Nitrogen and Argon Air Particles changed by respiration? Correct answer -Oxygen and CO2 Name 5 kinds of Air Pollutants Correct answer -Carbon Monoxide, Ozone, Sulfur Dioxide, Nitrogen Dioxide, Particulate Matter (dust, sand) Ozone Molecule Correct answer -O3 Ozone Pollutant Correct answer -Smelly gas that can cause breathing problems Air Quality Index Correct answer -Scale that ranks levels of ozone and other air pollutants (0-500) 500=high Air Quality index for Healthy -Moderate Air Correct answer -0-100 Atom Correct answer -Smallest particle of an element Molecule Correct answer -A group of atoms bonded together CHEM 104 Final Exam (Hill) ; Questions and Answers 100% Solved Classification of pure substances Correct answer -Elements and Compounds Compounds Correct answer -2 or more elements chemically combined; Completely the same chemical combination throughout Elements Correct answer -A molecule composed of one kind of atom; cannot be broken into simpler units by chemical reactions Inventor of Periodic Table Correct answer -Mendeleev What does an element's group tell us? Correct answer -Group is the vertical column. Tells us how many valence electrons are in the outer shell; tells us how reactive the element is Hydrocarbons Correct answer -Organic molecules consisting of only carbon and hydrogen. Have different prefixes than other molecules used for fuels Pneumonic for Hydrocarbon prefixed Correct answer -Mother Eats Peanut Butter Methane, Ethane, Propane, Cyclopropane Combustion Correct answer -Rapid reaction between oxygen and fuel that results in heat and light PPH to PPM conversion Correct answer -Move decimal four places to the right Types of Mixtures Correct answer -Heterogenous and Homogenous CHEM 104 Final Exam (Hill) ; Questions and Answers 100% Solved Heterogenous Mixture Correct answer -Mixture with uneven distribution of different substances; not the same throughout Homogenous Mixture Correct answer -Mixture in which the composition is uniform throughout What do periods mean on the Periodic Table? Correct answer -How many valence shells there are Protons Correct answer -Positively charged particles inside nucleus Neutrons Correct answer -Neutrally charged particles inside nucleus Electrons Correct answer -Negatively charged particles outside nucleus To be electronically stable, an atom must have an equal number of ___ and ___ Correct answer -Protons and Neutrons What does the Atomic number tell you? Correct answer -Number of protons in the nucleus. Always equal to the number of electrons (if stable) Alkali Metals Properties Correct answer -Highly reactive metals Halogens Properties Correct answer -Reactive non -metals Noble Gases Properties Correct answer -Un-reactive nonmetals
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