Description Circle the answer What is the density of a substance with a mass of 45.00 g an ...
Description Circle the answer What is the density of a substance with a mass of 45.00 g and a volume of 26.4 mL??? 1.70 g/mL? 0.59 g/mL? 0.587 g/mL? 45.0 g/mL? ??? 2 points QUESTION 9 Which of the following matters is a compound??? Copper? Water? Saline solution? Air? ??? 2 points QUESTION 10 A dose of aspirin of 5.0 milligram per kilogram has been prescribed to reduce the fever of an infant weighing 8.5 pounds. The number of milligram of aspirin that should be administered is?? 53 mg? 19 mg? 1.6 mg? 5.0 mg? ??? 2 points QUESTION 11 The number of valence shell electrons in all noble gases (except helium) is?? 6? 7? 8? 9? ??? 2 points QUESTION 12 The number of electrons in a neutral atom with 30 protons and 34 neutrons is?? 30? 64? 34? 94? ??? 2 points QUESTION 13 How many electrons is in the valence shell of a calcium atom??? 20? 8? 2? 1? ??? 2 points QUESTION 14 How many protons, neutrons, and electrons are in the following isotope, respectively??? 3, 3, 3? 3, 6, 3? 6, 3, 6? 6, 3, 3? ??? 2 points QUESTION 15 What is the ground state of a hydrogen atom??? Three electrons in the n=1 level? One electron in the n=2 level? One electron in the n=1 level? One electron in the n=1 level and one electron in the n=2 level? ??? 2 points QUESTION 16 Which substance would be present in the greatest concentration during the morning rush hour on a smoggy day in Los Angeles??? NO? O3? NO2? SO3? ??? 2 points QUESTION 17 When coal and fuel oil are burned, what two primary pollutants are formed??? SO2 and CO2? HNO3 and H2SO4? CO and O3? Hydrocarbons and NO2? ??? 2 points QUESTION 18 Why are small particulates in the atmosphere dangerous to human beings??? They can enter into and lodge in very small crevices of the lungs and cause concentrated abrasive injury.? They grind the enamel off of teeth.? They absorb and concentrate other pollutants.? They dissolve in rivers and lakes and fill them up.? ??? 2 points QUESTION 19 Convert 0.000053% to ppb?? 53 ppb? 530 ppb? 5300 ppb? 5.3 ppb? ??? 2 points QUESTION 20 Magnesium nitride is made up of magnesium ions and nitride ions. What is the expected formula of magnesium nitride??? MgN? Mg2N3? MgN2? Mg3N2? ??? 2 points QUESTION 21 How many nonbonding electrons are in the water molecule??? 0? 2? 4? 6? ??? 2 points QUESTION 22 How many nonbonding electrons are in the water molecule??? 0? 2? 4? 6? ??? 2 points QUESTION 23 Which of the following substances has polar covalent bonds??? CaF2? KBr? NH3? CH4? ??? 2 points QUESTION 24 What is the charge on an ion with 7 protons, 7 neutrons, and 10 electrons??? 0? +3? -3? -7? ??? 2 points QUESTION 25 How are carbon dioxide concentrations determined from thousands of years ago??? Analysis of decayed plant material? Analysis of ice samples? Analysis of the atmosphere? Analysis of the Earth’s core? ??? 2 points QUESTION 26 The highest recorded temperature on earth was 136°F in El Azizia, Libya. What is this temperature in Celsius??? 104 °C? 277 °C? 58 °C? 76 °C? ??? 2 points QUESTION 27 How much energy is in a gamma ray with a frequency of 2.5 x 1020 s-1 (E = hv where h = 1.58 x 10-34 cal • s)?? 4.0 x 1020 cal? 4.0 x 1054 cal? 4.0 x 10-20 cal? 4.0 x 10-14 cal? ??? 2 points QUESTION 28 What is the problem with increasing amounts of carbon dioxide in the atmosphere??? Its lack of consumption in respiration? A rise in pH of ocean water? Too much UV radiation being absorbed? Global warming? ??? 2 points QUESTION 29 What chemical bond is broken by a photon of light in a typical CFC molecule??? C-H? Cl-Cl? H-Cl? C-Cl? ??? 2 points QUESTION 30 Which type of chemical bond requires the least amount of energy to break??? Single? Double? Triple? Quadruple? ??? 2 points QUESTION 31 Approximately how many ozone molecules can one chlorine atom derived from one CFC molecule react with??? 1 molecule O3? 100 molecules O3? 1000 molecules O3? 100000 molecules O3? ??? 2 points QUESTION 32 Which of the following explains why CFCs are not removed from the atmosphere by rainout??? CFCs are not water solublen water.? CFCs are chemically inactive in the troposphere? UV radiation removes them more quickly.? This is due to both their chemical stability and solubility in water.? ??? 2 points QUESTION 33 Which will have the largest molar mass??? 1 mole of Ar, argon? 1 mole of CO, carbon monoxide? 1 mole of N2, nitrogen? 1 mole of Sn, tin? ??? 2 points QUESTION 34 What numbers are needed to balance the following equation, respectively? ____CO2 + ____H2O ---> ____C6H12O6 + ____O2?? 1, 1, 1, 1? 6, 6, 6, 6? 6, 6, 1, 6? 6, 1, 1, 6? ??? 2 points QUESTION 35 How many atoms are represented in the formula Ca3(PO4)2??? 9? 11? 13? 1? ??? 2 points QUESTION 36 What is the number of atoms in 1.0 mol of nitrogen dioxide, NO2??? 1.8 x 1024 atoms? 1.8 x 1023 atoms? 2.0 x 1023 atoms? 3 atoms? ??? 2 points QUESTION 37 The balanced equation for the decomposition of hydrogen peroxide, H2O2, is given below. What number of grams of O2 result from 3 . g of hydrogen peroxide??? 300. g O2? 3 . g O2? 320. g O2? 338. g O2? ??? 2 points QUESTION 38 The strength of an acid is related to its?? Extent of ionization? Reaction with a salt? Concentration? Commercial ranking in the economy? ??? 2 points QUESTION 39 What volume (in liters) of 1 M NaOH contains g sodium hydroxide??? 100 L? 1 L? 10 L? 1000 L? ??? 2 points QUESTION 40 What is the pH of a 0.0001 M HCl solution??? 10-4? 0.0001? -4? 4? ??? 2 points QUESTION 41 What is the salt formed when an HCl solution reacts with Mg(OH)2??? MgCl2? Mg2Cl? MgCl? Mg2Cl2? ??? 2 points QUESTION 42 How many moles of sulfuric acid, H2SO4(aq) are in 2.0 liters of 18 M H2SO4??? 9.0 mol? 20. mol? 36 mol? 98 mol? ??? 2 points QUESTION 43 In the equation 2 Na(s) + Cl2(g) ---> 2 Na+ + 2 Cl–, the oxidizing agent is?? Na (s)? Cl2 (g)? Na+? Cl-? ??? 2 points QUESTION 44 Identify the reduced species in the following equation CH4(g) + 2O2(g) ---> CO2(g) + 2H2O(g)?? ??? 2 points QUESTION 45 In an electrolysis reaction, oxidation occurs at which electrode??? Cathode? Anode? Both electrodes? Neither electrode? ??? 2 points QUESTION 46 Which of the following is a free radical??? Ozone, O3? Fluorine, F2? Chlorine, Cl2? Nitrogen dioxide, NO2? ??? 2 points QUESTION 47 How much heat is required to heat 25 g of liquid water from 20 °C to 100 °C?? 25 cal? 1000 cal? 2000 cal? 1 00 cal? ??? 2 points QUESTION 48 The phrase "acid rain" applies to rain water with a pH of?? 7? 6-7? < 5.6? 5.6? ??? 2 points QUESTION 49 Identify the exothermic process among the following.?? Wood burning? Boiling water? Melting ice? 100 cal of energy are absorbed? ??? 2 points QUESTION 50 Fertilizers such as nitrates and phosphates are examples of what type of pollutant??? Minerals and chemicals? Infectious agents? Plant nutrients? Oxygen-demanding wastes?
