CHEM 103 FINAL TAKE EXAM 2 2025

How many neutrons are in a neutral atom of thorium - answer-140 How many protons are in a neutral atom of argon - answer-18 How many outer shell electrons does silicon have - answer-4 How many bonds does carbon normally make - answer-4 How many bonds does nitrogen normally make - answer-3 How many electrons are in the calcium ion - answer-18 How many bonds does hydrogen normally make - answer-1 Whole milk contains water, milk sugar (lactose), milk fat and various other water soluble substances. Milk is - answer-a mixture Which of the following is not a compound - answer-kr The molecular shape (not the electronic shape) around a nitrogen that has three other atoms bonded to it and one lone pair is - answer-trigonal pyramidal The molecular shape (not the electronic shape) around a sulfur that has a double bond to one oxygen and single bonds to two other oxygen is - answer-trigonal planar How many atoms are in the molecule of toluene - answer-15 Is vegetable oil hydrophobic or hydrophilic - answer-hydrophobic Which of the following functional group is found in the molecule shown to the right - answer-an ester Here are four sketches at the molecular level of samples of matter. Decide whether each sketch shows a sample of an element, a compound, or mixture - answer-c. Mixture, element, compound, element Which of the following functional groups is found in this molecule - answer-carboxylic acid How many carbons in this molecule - answer-6 Chemistry Chemistry Chemistry How many hydrogens are on the carbon labeled c - answer-0 What is the shape around the atom pointed to by the arrow labeled c - answer-trigonal planar How many hydrogens are on the carbon labeled b - answer-1 What is the shape around the atom pointed to by the arrow labeled a - answer tetrahedral Which, if any, of the carbons in the structure above are stereocenters, i.e. Able to make a pair of stereoisomers - answer-b If lone pairs were drawn around the oxygens (either one), how many pairs should be drawn - answer-2 Which list gives the components of dry air - answer-n2, o2, ar, co2 Which of the following is not a major component of sea water - answer-hydrogen gas (h2) How many electrons (bonding and non bonding) should be in the final correct lewis structure of ethyl acetate (c5h10o2) - answer-42-49 Which of these molecules would have a three dimensional shape (vs. A flat only two dimensional shape) - answer-ch4 Which of the following molecules has an odd number of electrons in the final correct lewis - answer-no2 Is the molecule shown to the right hydrophobic or hydrophilic - answer-hydrophilic Three lewis structures are shown to the right. Which one is incorrectly written? - answer-c2h4 Which statement s not true about capsaicin - answer-capsaicin is highly soluble in water, so drinking water is a good way to relieve the burning sensation resulting from eating spicy foods Two structures are shown to the right - answer-the two structures are non superimposable, mirror images of each other A condensation reaction between an alcohol and a carboxylic acid yields what two products - answer-an ester and water ... Is a structural isomer of which of the following structures - answer-c Chemistry Chemistry For a fat or oil made from he molecule shown to the right, what is its physical state (solid, liquid or gas) at room temperature - answer-liquid Are the double bonds in the molecule shown to the right cis or trans - answer-cis Which level of protein structure includes the alpha helix and the beta sheet and involves regular, local (short ranged), and hydrogen bonded elements of structure - answer secondary Which of the following is not among the chemical and structural differences between dna and rna - answer-dna is a polymer of nucleotides; rna is a polymer of amino acids Which basic principle of chemistry is involved in sickle cell disease - answer-like dissolves like Which of the following statements is true about the term "essential" when referring to essential fatty acids - answer-humans cannot synthesize these substances so they must be included in the diet Soaps detergents and similar molecules are able to dissolve hydrophobic substances like oils in water because - answer-they surround the oil with a hydrophobic end of the soap molecule but allow the hydrophilic end to interact with the aqueous solvent Both starch and cellulose are poly-glucose. Why can cows eat both but we (human being's) can't? - answer-all of the above Polyester (polythylene terphthalate) is - answer-a synthetic, condensation polymer Which level of protein structure refers to the amino acid sequence - answer-primary Which level of protein structure has multiple protein chains involved in forming the functional protein as in hemoglobin where four monomers are required - answer quaternary The 3 dimensional structure of protein composed of a single polypeptide chain as illustrated by the structure shown to the right is known as - answer-the tertiary structure A hormone is a molecule produced by cells in one part of the body that produces a response in a far removed part of the body. An example of a hormone-like molecule involved in the pain response is - answer-a prostaglandin What kind of reaction is the reaction shown immediately above - answer-condensation What kind of reaction is the reaction shown immediately above - answer-addition polymerization Chemistry Chemistry How many different amino acids are there in naturally occurring proteins - answer-20 What kind of reaction is the reaction shown immediately above - answer-hydrolysis What kind of reaction is the reaction occurs when starch breaks down into glucose by the action of the enzyme amylase in your saliva - answer-hydrolysis Nsaids, like aspirin, work directly by - answer-inhibiting the enzyme cox so that prostaglandins are not produced What is the monomer that makes up the polymer in wool - answer-an amino acid Polystyrene (styrofoam) is - answer-a synthetic, addition polymer Solid water (ice) floats on liquid water because - answer-hydrogen bonds make the solid less dense than the liquid Based on your knowledge of the polarity of water molecules, he solute molecule shown in the figure is most likely - answer-positively charged The piece of structure shown in the figure above is a short stretch of a(n) - answer-beta sheet Can there be a hydrogen bond between the 2 groups shown in the rectangle - answer no Can there be a hydrogen bond between the 2 groups shown in the oval - answer-yes What is the functional group in the triangle - answer-amide Silk is - answer-a natural, condensation polymer Which type of bond must be broken for water to be converted to steam - answer hydrogen bonds Which one of these structures to the right does not illustrate a valid hydrogen-bonding pattern - answer-c Biofuels/biomass make up what percentage of renewables? Don't count nuclear as a renewable - answer-more than 60% If 2 moles of diesel (c12h24) undergo complete combustion, how many moles of co2 are produced - answer-24 Chemistry Chemistry A device put on a car to remove nox's, volatile organic compounds, and carbon monoxide is - answer-a catalytic converter Ethanol (c2h6o) is an important biofuel that is added to gasoline and burned in a complete combustion reaction. What is the mole ratio of ethanol to co2 in the combustion of ethano - answer-1 ethanol:2 co2 Which of the following are pros (for) for the use of coal as an energy source - answer-t is located in nearly every part of the world Energy independence is the idea that - answer-rhe us makes more energy than it needs and exports or stores the extra Where do nox's come from - answer-nitrogen in the atmosphere reacts with oxygen in the atmosphere when high temperature combustion occurs Suppose us energy use efficiency is 40%. Our total (primary) energy use in 2019 was 105.7 ej. How much energy is actually used in our energy requiring processes (electricity, heating a house, moving the car) - answer-40-50 ej How many kilograms of co2 is emitted when you burn (assume complete combustion) 10 kilograms of charcoal (c7h4o) in your charcoal grill? That's about a 20 lb bag. (1000 g = 1 kg) - answer-10-35 kg Based on the above figure, which of the following does not contribute co2 to the atmosphere - answer-photosynthesis All of these are arguments against fracking except - answer-fracking provides abundant and cheaper natural gas Burning coal is an ________________ reaction; boiling water is an __________________ reaction - answer-exothermic...endothermic Wood is a biofuel and is mostly made of cellulose, a polymer of glucose. Consider the formula of wood to be c12h22o11. How much co2 when 1.00 kj of he