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