BSC 114-Exam 1 Practice Questions And Answers Fully Solved

the element is required in very small amounts - correct answers In the term trace element, the adjective trace means that one more neutron - correct answers Compared with ^31P, the radioactive isotope ^32P has the existence of unpaired electrons in the valence shell - correct answers The reactivity of an atom arises from The atom has more electrons than protons - correct answers Which statements is true of all atoms that are anions? The rates of the forward and reverse reactions are equal - correct answers Which of the following statements correctly describes any chemical reaction that has reached equilibrium? 8p+, 10n^0, 8e- - correct answers We can represent atoms by listing the number of protons, neutrons, and electrons-for example, 2p+, 2n^0, 2e- for helium. Which of the following represents the ^18O isotope of oxygen? H2S - correct answers The atomic number of sulfur is 16. Sulfur combines with hydrogen by covalent bonding to form a compound, hydrogen sulfide. Based on the number of valence electrons in a sulfur atom, predict the molecular formula of the compound. 2;2 - correct answers What coefficients must be placed in the following blanks so that all atoms are accounted for in the products? C6H12O6 S _____ C2H6O + _____ CO2 wax - correct answers Which of the following is a hydrophobic material? number of moles - correct answers We can be sure that a mole of table sugar and a mole of vitamin C are equal in their 10^-4 M - correct answers Measurements show that the pH of a particular lake is 4.0. What is the hydrogen ion concentration of the lake? 10^-10 M - correct answers What is the hydroxide ion concentration of the lake described in question 5? 10 degrees C - correct answers A slice of pizza has 500 kcal. If we could burn the pizza and use all the heat to warm a 50-L container of cold water, what would be the approximate increase in the temperature of the water? (Note: A liter of cold water weighs about 1 kg.) carbon, nitrogen, oxygen, hydrogen, phosphate, sulfur - correct answers What are the six most important chemical elements of life? carbon - correct answers Which element is always associated with organic chemistry? The isomers are enantiomers, with one having toxic effects on humans. - correct answers A pharmaceutical company was forced to recall a pain reliever medication that had been linked to the fatalities of several hundred people. Analysis of the recalled drug revealed the presence of two isomers due to an asymmetrical carbon atom in the drug molecule. What can be hypothesized from this observation? 6 hydrogen atoms and 3 carbon atoms - correct answers A straight-chain carbon compound constructed from __________ must contain at least one carbon-carbon double bond. Each carbon atom acts as an intersection point from which a molecule can branch off in up to four directions. - correct answers What is the reason carbon atoms are the most versatile building blocks of the molecules used by living organisms? hydrophobic, nonpolar, good source of stored energy - correct answers Which of the following are properties of hydrocarbons? 2 - correct answers A molecule has one carbon-carbon double bond and four monovalent atoms or groups. How many different cis-trans isomers exist for this molecule? -NH2 - correct answers Which of the following functional groups is present in all amino acids? (eText Concept 4.3) both —COOH and —NH2 - correct answers Which of these is found in all amino acids? (eText Concept 4.3) share the same functional group: a hydroxyl - correct answers Ethanol, propanol, and methanol are three simple alcohols. They can be grouped together because they __________. (eText Concept 4.3) The covalent bond between oxygen and hydrogen is so polar that hydrogen ions tend to dissociate from oxygen reversibly. - correct answers Which of the following examples best describes a unique functional property of the carboxyl group? (eText Concept 4.3) phosphate group - correct answers Which of the following functional groups is associated with a release of energy when removed from the carbon skeleton with water? (eText Concept 4.3) acid ... amino - correct answers Choose the pair of terms that correctly completes this sentence about functional groups in organic chemistry: Carboxyl is to __________ as __________ is to base. (eText Concept 4.3) ATP stores the potential to react with water, thereby removing a phosphate group and releasing energy for cellular processes. - correct answers What is ATP's importance in the cell? (eText Concept 4.3) They have double bonds in the carbon chains of their fatty acids. - correct answers Which of the following statements concerning unsaturated fats is true? primary level. - correct answers The structural level of a protein least affected by a disruption in hydrogen bonding is the The phosphodiester linkages of the polynucleotide backbone would be broken. - correct answers Enzymes that break down DNA catalyze the hydrolysis of the covalent bonds that join nucleotides together. What would happen to DNA molecules treated with these enzymes?