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Is burning paper a chemical or physical change?
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Is cutting firewood a chemical or physical change?
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Chem 100 Final

Final review questions

QuestionAnswer
Is burning paper a chemical or physical change? chemical
Is cutting firewood a chemical or physical change? physical
Is snow melting a chemical or physical change? physical
Is tea a substance or mixture? mixture
Is table salt (NaCl) a substance or mixture? substance
Is Nitrogen a a substance or mixture? substance
Is gasoline a homogeneous mixture or heterogeneous mixture? homogeneous
Is chocolate chip ice cream a homogeneous mixture or heterogeneous mixture? heterogeneous
(T/F) a scientific law summarizes data and observations while a scientific theory explains the data and observations. True
(T/F) all samples of pure copper (Cu) will have the same density, regardless of size. True
(T/F) According to MODERN atomic structure theory, ALL carbon atoms are identical False
(T/F) Electrons have the same mass as protons and neutrons. False
(T/F) Gases can be compressed (have their volume changed) because the particles are NOT packed closed together. True
(T/F) Electrons are found in the nucleus of the atom. False
(T/F) According to the law of conservation of mass, matter is neither created nor destroyed in a chemical reaction. True
(T/F) One conclusion from Rutherford's gold foil experiment was that atoms contain a lot of empty space. True
(T/F) If an object's density is less than the density of water, it will sink to the bottom of the water. False
Is Br a metal, metalloid, or nonmetal? nonmetal
Is K a metal, metalloid, or nonmetal? metal
Is C a metal, metalloid, or nonmetal? nonmetal
Is Si a metal, metalloid, or nonmetal? metalloid (semi-metal)
Is Na a noble gas, halogen, or alkali metal? alkali metal
Is a F a noble gas, halogen, or alkali metal? halogen
Is Ne a noble gas, halogen, or alkali metal? noble gas
What's the element symbol for nitrogen? N
What's the element symbol for potassium? K
What's the element symbol for phosphorus? P
What's the element symbol for nickel? Ni
What's the element symbol for iodine? I
What's the element symbol for iron? Fe
What's the element symbol for sulfur? S
What's the element symbol for sodium? Na
What's the element symbol for silicon? Si
(T/F) Cations are positively charged ions. True
(T/F) Outer (valance) electrons are the most important electrons when atoms form chemical bonds. True
(T/F) The noble gases are unstable elements because they contain the maximum number of electrons in their orbits/orbitals. False
(T/F) According to their positions on the periodic table, the elements O and Se will have some similar chemical properties. True
(T/F) According to the octet rule, when Ca forms an ion, it will be Ca 2+ True
(T/F) The formula of the ionic compound that forms between K and O is KO False
(T/F) The first two Bohr orbits (n=1 and n=2) can hold a max. of 16 electrons total. False
What chemical substance is the organic molecule that was used as the first anesthetic in the 1800's? Ether
What chemical substance is the organic molecule that often have a sour taste? Carboxylic acids
What chemical substance is the organic molecule that is found in drinks such as beer, wine, or hard liquor? Alcohols
What chemical substance is the organic molecule that often smell badly like decaying fish and flesh? Amines
What chemical substance is the organic molecule that is commonly used in food flavoring and perfumes? Ester
What chemical substance is an illegal stimulant that can uncommonly be used to treat ADHD, obesity, and narcolepsy? methamphetamine
What chemical substance is an anticancer drug that resembles substance essential to normal body functions antimetabolite
What chemical substance is a drug once used in a couples therapy and to treat depression but is now known exclusively as an abusive drug with dangerous side effects? Ecstasy
What chemical substance is a naturally occurring narcotic found in opium poppy plants? morphine
What chemical substance is a mildly addictive stimulant found in some foods and beverages? Caffeine
(T/F) food that shows 0.0g of trans fat on the nutritional label must contain no trace of trans fat. False
(T/F) Penicillin attacks bacteria by not allowing bacteria to properly form cell walls. True
(T/F) Cocaine, caffeine, and nicotine are all in the same class of drugs: stimulants. True
(T/F) The octane rating of gasoline refers to the amount of the organic substance octane that is present in the fuel. False
(T/F) The chlorinated hydrocarbon pesticide DDT is chemically unstable and reacts immediately with anything it comes in contact with in the environment. False
(T/F) Toxic chemicals are added to ethanol not intended for human consumption (i.e. for use in lab) to prevent abuse and for taxation purposes. True
(T/F) Heart disease was the leading cause of death in 1900. False
(T/F) Bases are commonly found in foods because they have a sour taste. False
(T/F) Vitamin C can cure the common cold. False
(T/F) Elevated levels of acid rain has endangered marine life in some lakes in Canada and the US. True
(T/F) A nuclear power plant has the potential to explode like a nuclear bomb. False
(T/F) An acid donates a proton (H+) in a chemical reaction. True
(T/F) So far, there are no studies showing a direct link between cell phone usage and increased risk of forming brain tumors. True
(T/F) When baking, baking powder and baking soda contain the same substance(s) and are completely interchangeable. False
(T/F) Vitamin C is an important part of a healthy diet. True
(T/F) The US is one of the top energy consumers in the world. True
(T/F) Food that is irradiated to delay ripening or decay remains slightly radioactive afterwards. False
Created by: yulissalira
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