Master Chemistry with Fun Quizzes & Brain Teasers!

APredict the missing componentin the nuclear equation.-10231 Th 90B231 Pa + X91He07
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The table compares some characteristics of two atoms.Charged ParticlesAtom Number of Neutrons Mass NumberX 4 7Y 5 9Use the table to determine the number of protons for each atom. Then, choose the statement below that is true about the two atoms. Atoms X and Atom Y are in the same family. Atom X is in a column to the right of Atom Y on the periodic table. Atom X and Atom Y are in the same row on the periodic table. Atoms X and Atom Y are isotopes.
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What is the formula for cobalt (III) oxide? Co3O2 Co2O3 Co3O CoO3
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When a mixture of carbon and water is filtered what is the residue
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The speed of light constant (c) is:3.00 x 108(m/s)9.8m/s6.626 x 10-34(J)101.325kPa
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When a mixture of carbon and water is FILTERED, which of theseis the RESIDUE?Options: The UNDISSOLVED SOLID: carbonThe LIQUID: waterThe MIXTURE: carbon + water[NONE of these]: You cannot filter carbon+ water
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T/F. during recovery from exercise in a hot, humid environment, rehydration should be designed to replace 100-150% of the water lost during exercise and contain approximately 3.5 g of sodium per liter of fluid.
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T/F. some seashells are affected by more acidic water conditions because hydrogen ions tend to bond with the carbonate ions necessary for seashell formation.
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The Cori cycle is a metabolic pathway that involves active muscles and the liver. fatty acids glucose glucose glycolysis ATP gluconeo- genesis ATP CO2 + H2O lactate lactate LIVER MUSCLE Complete the sentences about the Cori cycle. Muscles break down into , which undergoes glycolysis. The end product of glycolysis in active muscles is , which is transported in the blood. The liver uses energy from to drive The produced in the liver is transported to the muscle in the bloodstream. Answer Banklactate pyruvate fatty acid oxidation glycolysis glycogen gluconeogenesis glucose
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Two identical flasks of equal volume are kept at the same temperature. Flask A contains argon (Ar) and flask B contains krypton (Kr). If the pressure inside both flasks is measured to be the same and we assume the gases behave as ideal gases, which answer correctly completes the following statements: (i) The average kinetic energy of the atoms in flask A is _______ the average kinetic energy of the atoms in flask B. (ii) On average, the atoms in flask A are moving _______ than the atoms in flask B.O less than, slower than O greater than, faster than O equal to, the same speed as O equal to, faster than O less than, the same speed
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The Solubility Of Fe (OH)2 In Water At 25 C Is Measured To Be 5.2x 10-4 Fe(OH)2 Use This Information To Calculate K Round Your Answer To 2 Significant Digits.
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Place the steps involved in the Fischer esterification reaction in the correct order, starting with the first step at the topAcid protonates the carbonyl oxygen atomThe alcohol attacks the carbonyl carbon atom, causing the C=O pi bond to breakProton exchange results in the formation of a neutral tetrahedral intermediateAn -OH group is protonated, creating a good leaving groupH2O is eliminated and the C=O pi bond is reformedProton exchange produces a neutral product
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a metal oxide with the formula m2o contains 11.18% oxygen by mass. in the box below, type the symbol for the element represented by m. [a]
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the term middle ages was coined by a roman pope to describe the period between the end of the roman empire and the spread of christianity.
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this method of acquiring mw differs from sec and gives dosy nmr many advantages over sec. as stated before, molecules of specific sizes produce indi-vidual diffusion coefficients. due to low sample con-centration, the purity of polymer is not as essential compared to sec; thus, reducing preparation time. dosy also requires minimum amounts of solvent
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the first 32 amino acids from the N terminus of the protein bovine angiogenin were determined by edman degradation and have the sequence: AQDDYRYIHFLTQHYDAKPKGRNDEYCFNMMK (a) Identify the sites of cleavage during trypsin-catalyzed hydrolysis of this protein. (b) What are the cleavage sites using chymotrypsin?
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Compound S (C8H16) reacts with one mole of bromine to form a compound with molecular formula C8H16Br2. The broadband proton-decoupled 13C spectrum of S is given below. Propose a structure for S.Note: All structures should be drawn with no bonds between carbon and hydrogen.
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In a gas chromatogram, the retention time of compounds A and B are 1.25 min and 1.45 min, respectively. If both of these compounds have similar structures, which of the compounds has a higher boiling point?
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Which of the following is an observation of a chemical property?Ozinc reacts with hydrochloric aciddensity of wood is 0.51 g/cmwater boils at 100C.sand paper is roughly textured
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what is the balance chemical reaction for synthesis of sodium and sulfur
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a sodium intake above 2000 milligrams per day may increase and sodium loss in the urine increasing a person's risk for bone loss.
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in general, carboxylic acid derivatives undergo nucleophilic acyl substitution reactions readily because . (select all that apply.)
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Which of the following compounds has a number of electron rich regions that is different from the other compounds? BCI 03 NH3 NO3
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classify the sample according to its composition. check all that apply. classify the sample according to its composition.check all that apply. the sample is a homogeneous mixture. the sample is a compound. the sample is a pure element. the sample is a heterogeneous mixture.
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