General Questions and Answers

1 2 What is an indicator and how is it used

What type of reaction is shown in the LOL Diagram Energy 1 O Echemical Ethermal Endothermic O Exothemic O There is something wrong with this diagram Energy Echemical Ethermal

21 The molecular formula and boiling points of hydrocarbons are given in the table below Table 1 Hydrocarbon Bealing Feints Hydrocarbon Formula Butane Decane Ethane Heptane Hexane Methane Nonane Octane Pentane Propane C4H10 C10H22 C H6 C H16 CH14 CH4 C H 0 CgH 18 C5H12 C3H8 Boiling Point 0 5 174 0 88 6 98 4 68 7 161 7 150 8 125 7 36 1 42 1 Based on the information in the table what is the trend in the boiling point as the number of carbons

17 HF

Read the following paragraph from the section Key Points An ionic bond essentially donates an electron to the other atom participating in the bond while electrons in a covalent bond are shared equally between the atoms Which idea is BEST supported by this paragraph A B C D The distinction between ionic and covalent bonds is determined by how equally the atoms in the bond share their electrons lonic bonds have atoms that donate one electron to another atom in the bond while atoms in covalent bonds have a tendency to donate all their electrons Electrons in a covalent bond always share their electrons equally between the atoms but electrons in ionic bonds only share equally occasionally Covalent bonds sometimes have bonds between identical atoms so they can share electrons equally while ionic bonds always

19 HCIO4

The rust that appears on steel surfaces is iron III oxide If the rust found spread over the surfaces of a steel boat hull contains a total of 1 324 x 1023 oxygen atoms how many grams of rust are present on the boat hull

Which of the following values represents the enthalpy change for the reaction CH4 g H O g CO g H g TABLE Single Bonds C H 55555 ISUOU T Si Average Bond Enthalpies kJ mol 413 348 293 358 185 328 276 259 323 226 368 461 Multiple Bonds IN 179 ZZZZZZ N H H NOFUE CI Br H H H F CI Br I P C 391 163 201 272 200 243 436 431 366 299 00000 HOFUL 140 4 S Br 463 146 190 203 234 339 327 253 218 266 F F CI F Cl Cl Br F Br CI Br Br Br 155 253 242 37 218 193 208 175 151

A 1 81 mol sample of Xe gas is confined in a 44 3 liter container at 25 0 C If the temperature of the gas sample is increased to 49 2 C holding the volume constant the pressure will increase because Choose all that apply With higher average speeds on average the molecules hit the walls of the container with more force With lower average speeds the molecules hit the walls of the container less often At higher temperatures molecules have higher average speeds As the average speed increases the number of molecule wall collisions decreases None of the Above

Which best describ the The individual particles are atoms of different types O There are too many particles in the diagram The diagram shows a balanced chemical equation O Mass is created in the diagram Mas is neither created nor destroyed in the diagram

Below is a particle diagram for a homogenenous mixture of two substances What do the hexagons 6 sided particles represent in the diagram O The solution The solute O The solvent

A scientist has a 100mL solution of HCI with an unknown concentration They titrate it with an LIOH solution and a pH indicator until it shows a neutral pH If the solution required 200mL of a 1M LIOH solution to be fully titrated what is the concentration of the HCI solution HCl aq LiOH aq H O aq LiCl aq O2M O 0 2M 0 4M O 3M 1M

A pencil is viewed through a concave lens Which of the following best describes the image Object OA Enlarged B Reduced O C Real OD Inverted Image F F

Which chemical equation best represents the particle model below 4 O 4P s 502 g 2P205 s OP O2 g P O5 s 2P s 202 g P O s O 2P2O5 s 4P s 502 g 3P 40 BO

What is the insoluble solid substance that is produced during some aqueous chemical reactions In this reaction example that would be AgF s NaF aq AgNO3 aq AgF s NaNO3 aq solute O precipitate O titrant reactant

Select the compound with the greatest molar mass silicon tetrabromide Osilicon tetrafluoride O carbon tetrafluoride Ophosphorus trichloride Ophosphorus trifluoride O carbon tetrabromide