General Questions and Answers

Convert the Following 3 2 kilometers 0 23 centimeters 0 12 liter 2500 millileters 4500 grams PO 9 kilograms 54 megaliters meter millimeters HF milliliters liters kilograms grams centiliters Circle the acids and underline the bases Ca OH Identify Physical or Chemical Change Sugar dissolved in water Wood burning Digestion Water Boiling Two liquids bubble when mixed Cooking food Melting butter Circle the indicators of physical changes Underline the indicators of a chemical change

efer to the chemical equation representing the blood buffer system below to answer the following questions Indicate yes or no as your answer in each box CO H O H CO3 H 0 HCO3 H30 Which of the following are ways the body compensates for alkalosis More Information Question Breathing faster hyperventilating Adding H30 from kidneys to blood Adding HCO3 from kidneys to blood Other buffers adding H30 to blood Answer

A prescription is given that reads 100 mg three times a day The available medication is a bottle that contains 0 5 g and the instructions say to recon with water to a concentration of 0 5g 5 ml How many mL of the reconstituted medication would you need each day

For the reaction of molecular iodine gas into atomic iodine gas the equilibrium constant Ke is 0 00213958778017127 at 707 C for the following reaction 112 g 2 g if the initial concentration of 1 2 g s 0 15M what is the equilibrium concentration of itg

If lung problems like emphysema occur the blood pH of the patient is expected to saturate increase decrease stay the same concentrate

Suppose 80 6 mL of a 0 136 M solution of Na SO reacts with 161 mL of a 0 372 M solution of MgCl to produce MgSO an NaCl as shown in the balanced reaction Na SO aq MgCI aq MgSO s 2NaCl aq Determine the limiting reactant for the given reaction O MgCl O NaCl O MgSO4 Na SO4 Calculate the mass of MgSO that can be produced in the given reaction mass of MgSO Only 0 299 g of MgSO are isolated after carrying out the reaction Calculate the percent yield of MgSO 60

plete the table There is enough information given for each element to determine all missing numbers Symbol Mass Number Number of Atomic Number Number of Protons Electrons 23 Na K F 1311 368 20 50 1 40 41 109 2 47 19 18 50 46 1 Number of Neutrons 10 72

solution with OH of 5 x 10 3 has a pH of 2 3 2 3 11 7 7 0 5 0

The Titration Fill a buret to the 0 00 mL mark with the Standard 0 100 M KHP solution Fill a second buret to the 0 00 mL mark with the unknown sodium hydroxide solution Using the buret add about 10 00 mL of the acid KHP solution to an Erlenmeyer flask Add two to three drops of phenolphthalein indicator to this flask Titrate the standard acid KHP solution in the flask with the unknown NaOH solution To titrate the acid slowly add the sodium hydroxide from the proper buret until the solution in the Erlenmeyer flask is a faint pink color This should take from between 5 to 10 mL of base Titrate at least 3 samples of base NaOH The three samples should have molarities that are close together A good titration is one where the individual molarity values do not change by more than a few thousandths between all three titrations NaOH sample I Final Volume NaOH 22 7 Final Volume of Acid KHP 222 Initial Volume NaOH 0 00 mL Initial Volume of Acid KHP 0 00 mL Ilm of NaOH Used 22 7MLVolume of Acid KHP Used ML

Write the balanced molecular chemical equation for the reaction of solid lithium with aqueous chromium III acetate If no reaction occurs write NR

A leak occurs in a chemical reactor with an equimolar mixture of O CH4 C3Hg CO CO gases After a few minutes a CO detector located on the other side of that room triggers an alarm At that exact moment select among the following sentences THE ONE THAT APPLIES re O a The fraction of all these 5 gases left inside the container after the leak will remain equimolar O b The CO was the first gas that made it to the detector because it is the lightest of them all Oc Methane was detected first because its lower molar mass makes its average kinetic energy lower Od The concentration of CO is higher than that of the other gases because it is the heaviest molecule Oe Among the gases left inside the container CH4 will be the one in smaller proportion

Categorize each partial electron configuration and Lewis electron dot symbol with the correct group in the periodic table ns np Be Mg ns np ns ns ns np N B Na Ar ns np F Li AI ns np5 i P ns np4 Ne

What must be the new volume of a sample of nitrogen in L if 2 89 L at 747 torr and 24 4 C is heated to 377 8 C unde conditions that let the pressure change to 769 torr

How many grams are in 5 10 x 1015 molecules of CO

How many grams of carbon dioxide would be required to react with 82 0 g of LiOH in the following chemical reaction 2 LiOH s CO g Li CO3 s H O 1

An aqueous solution of sodium sulfate Na2SO4 contains 1 53 grams of sodium sulfate and 17 8 grams of water The percentage by mass of sodium sulfate in the solution is

4 Refer to the filled in Closing Disclosure The property taxes of 365 04 fit into which categories a a debit to both the buyer and seller b a credit to both the buyer and seller c a debit to the seller and a credit to the buyer d a credit to the seller and a debit to the buyer

A balloon contains 7 00 L of gas at sea level 1 00 atm If the balloon is taken to a point with air pressure of 0 860 atm what will the new volume be in liters Assume no change in temperature Report your answer using three significant figures Provide your answer below

Select the molecules that are polar CH CL ASF IOF S CF4

Rank the following ionic compounds lattice energies from lowest to highest SrF2 CaO RbCl and BaF2 Select Select BaF2 SrF2 RbCl Select V Select V Select

5 1 point A tidal wave traveling across the ocean at 45 miles per hour Does this have more kinetic or potential energy potential kinetic

A large raindrop contains 1 45 x 1022 atoms What is the mass of the raindrop in grams O 0 289 g 0 145 g 0 848 g O 0 434 g

When calcium carbonate is added to hydrochloric acid calcium chloride carbon dioxide and water are produced CaCO3 s 2 HCl aq CaCl aq H O 1 CO g How many grams of calcium chloride will be produced when 31 0 g of calcium carbonate is combined with 12 0 g of hydrochloric acid mass of CaCl O CaCO HCI 5 13 Which reactant is in excess Incorrect Incorrect How many grams of the excess reactant will remain after the reaction is complete

Te prod of the reaction ap to select or deselect answer N and H O N and H3 N2 O N and H N and H3 NH and H

Using the reaction bank devise a synthetic route should use several reactions to convert the starting material into the product Remember order is important Step 1 Reaction C Step 2 Reaction A Step 1 Reaction A Step 2 Reaction B Step 1 Reaction A Step 2 Reaction C Step 1 Reaction C Step 2 Reaction B OCH3 Reaction Bank A H CRO4 heat B CH OH HCI C NBS H O heat

se the precipitation interactive to select the solution that reacts with the KI K CO3 K S entify the precipitate that forms and the spectator ions that remain in the solution following this reaction PbCO s Answer Bank S aq I aq PbS s CO3 aq Pbl s K aq Pb aq KNO s

termine whether the combination of each pair of solutions can or cannot be tested in the precipitation interactive Can be tested in the interactive K CO NO3 2 Answer Bank Cannot be tested in the interactive

How many moles of Ag are needed to react with 40 moles of HNO3 3Ag s 4HNO3 aq 3AgNO3 aq 2H O l NO g 120 g 53 mol 40 mol 3 mol 30 mol

termine whether each compound is soluble or insoluble in water Soluble Hg Cl k Insoluble

An aqueous potassium iodate KIO solution is made by dissolving 5 20 x 10 grams of KIO in sufficient water so that t final volume of the solution is 4 00 L Calculate the molarity of the KIO solution KIO

A cyanide solution with a volume of 13 84 mL was treated with 23 00 mL of Ni solution containing excess Ni to convert the cyanide into tetracyanonickelate II 4 CN Ni Ni CN 2 The excess Ni2 was then titrated with 11 09 mL of 0 01331 M ethylenediaminetetraacetic acid EDTA Ni EDTA4 Ni EDTA Ni CN does not react with EDTA If 38 21 mL of EDTA were required to react with 29 14 mL of the original Ni solution calculate the molarity of CN in the 13 84 mL cyanide sample

M V M V where M and V are the initial concentration and volume respectively and M 2 and V represent the final concentration and volume respectively When preparing a dilute solution it is necessary to first calculate the volume of stock solution needed Which of the expressions is equal to the volume of stock solution V M M V M V M M V

Calculate the final molarity of H O if 5 3 mL of a 3 0 w w H O solution which has a density of 1 0 g mL is added to 5 3 mL of a starch iodide solution final H O Calculate the final molarity of H O if 1 3 mL of the 3 0 w w H O solution is diluted with 3 7 mL water then added to 5 0 mL of a starch iodide solution final H O M M

tion 5 1 pt stion 6 1 pt stion 7 1 pt stion 8 1 pt K3PO4 aq CrCl3 aq CrPO4 s KCl aq K3PO4 aq CrCl3 aq CrPO4 s 3KCl aq K3PO4 aq CrCl3 aq CrPO4 s 2KCl aq K3PO4 aq CrCl3 aq CrPO4 s KCl aq K3PO4 aq 2CrCl3 aq CrPO4 s 2KCl aq b Balance the following chemical equation Fe s H SO4 aq FeSO4 aq H g Fe s H SO4 aq 2FeSO4 aq H g 2Fe s H SO4 aq 2FeSO4 aq H 9 Fe s H SO4 aq FeSO4 aq H g 5Fe s H SO4 aq FeSO4 aq H g Balance the following chemical equation NaOH aq HCl aq NaCl aq H O l 3NaOH aq HCl aq 3NaCl aq H O 1 2NaOH aq 2HCl aq 2NaCl aq H O l NaOH aq HCl aq NaCl aq H O l NaOH aq 3HCl aq 5NaCl aq 3H O l Balance the following chemical equation FeCl3 aq KI aq 1 s FeCl aq KCl aq 2FeCl3 aq 2KI aq 1 s 2FeCl2 aq 2KCl aq FeCl3 aq 2KI aq 12 s FeCl aq KCl aq FeCl3 aq KI aq 1 s FeCl aq KCl aq

6 Sulfur dioxide can be produced in the laboratory by the reaction of hydrochloric acid and sodium sulfite Sodium chloride and water are also produced What mass of SO can be n from 25 0 g of Na SO3 and 22 0 g HCI Be sure to first balance the following unbalanced equation HCl aq Na SO3 SO H O NaCl

Find the total resistance from points A to B A 100 400 400 350 200 300

A nitrogen can undergo sp hybridization and then become joined to carbon by a triple bond to give the structural unit CEN This triple bond consists of one and two bonds Using the carbon carbon triple bond as an anology and drawing pictures to show which atomic orbitals overlap with which show how the three bonds of the triple bond in CEN form Select the best description of the a bonding and the best description of the bonding The o bond is overlap of two p orbitals one from C and the other from N The o bond is overlap of two sp hybridized orbitals one from C and the other from N Each bond is overlap of two sp hybridized orbitals one from C and the other from N Each bond is overlap of two p orbitals one from C and the other from N None of these

How many moles of precipitate will be formed when 74 0 mL of 2 00 M Nal is reacted with 100 0 mL of 0 900 M Pb NO in the following chemical reaction 2 Nal aq Pb NO 2 aq Pbl s 2 NaNO aq

How many moles of precipitate are formed when 74 9 mL of 0 250 M Ca NO is mixed with excess LiPO in the following chemical reaction 3 Ca NO 2 aq 2 LiPO aq Ca PO s 6 LINO aq 1

Which one of the following correctly shows the weak acid equilibrium for trichloroacetic acid CCI COOH A CCI COOH aq CCI CO aq OH aq B CCI COOH aq H O 1 CCI COOH aq OH aq C CCI COOH aq H O 1 CCI COO aq H O aq D CCI COOH aq H O 1 CCI CO OH aq H aq

READ THE PASSAGE Cause and Effect Think about why engineers would want to build a robot like ASIMO ASIMO I In 1986 engineers at Honda the car and motorcycle company wanted to create a robot that could walk Z like a person This might sound like a strange goal but building a robot that walks like a person has been one of the most difficult challenges for robot designers and builders If you think about it most robots invented today have wheels or do not have movement at all The first walking robot that the Honda team built was just a pair of legs It took teams of workers almost 15 years and several generations of robots C before they finally created a true humanoid robot called ASIMO which stands for Advanced Step in 7 Innovative Mobility ASIMO looks like a small astronaut The robot stands at 4 feet 3 inches tall and weighs 119 pounds 9 ASIMO has motors and joints that allow it to move its head arms hands legs and feet much like humans Odo ASIMO has danced jogged and conducted orchestras at public demonstrations in order to help inspire kids to stay interested in science as well as to show off some of the new inventions and discoveries that Zscientists have made while creating ASIMO ASIMO is even a featured attraction at Disneyland in California Can you imagine a team of firefighting robots rushing into a burning building or clean up robots responding to a chemical spill Some people are hoping that human like robots such as ASIMO will one day be able to perform dangerous jobs so that humans will not have to In the meantime scientists have Finvented new devices based on Honda s ASIMO to help people walk stand and work with less back and 17leg strain Scientists hope these devices can help disabled people move and work more easily SKILL PRACTICE Read each question Fill in the bubble next to the correct answer 1 Why did it take scientists almost 15 years to build ASIMO A People were not interested in a walking robot Building a walking robot was very difficult Honda did not assign many workers to the ASIMO project WEEK 29 DAY 1 The engineers could not agree on the design of the robot 2 Why has ASIMO conducted orchestras A to replace human orchestra conductors to encourage children to join orchestras Oto keep humans from doing a dangerous job to show one of the surprising things the robot can do 3 One reason ASIMO performs at public demonstrations is to inspire students to study science make other companies jealous sell robots made by Honda O generate interest in Disneyland 4 What has ASIMO development research already led to the elimination of dangerous jobs B devices to help people move increased space exploration O improved fire safety STRATEGY PRACTICE Write a question that can be answered with information from the passage Ask a partner to answer it

n plant cells and animal cells have cell walls True False

A sample of nitrogen has a volume of 838 mL and a pressure P of 782 torr What pressure P2 will change the volu to 828 mL at the same temperature P2 i torr

2 CHEMICAL REACTIONS Complete each reaction Classify the reactions below as synthesis decomposition single replacement cationic or anionic or double replacement 4 5 1 6 H O H O 1 2 3 Zn H SO Zn 504 H Vonmetals CO 0 HgO KBr Cl 7 CaO H O 9 H O H O H O 8 AgNO3 NaCl CO Name Czaring Tela H O O Synthesis reaction Decomposition reaction Single replacement Combustion reaction

3 only in science fiction inspired scientists are now creating toys me 4 that are controlled directly by the brain what you want for dinner a part of your brain becomes active It receives more oxygen blood flow and Every time you think about something whether it is noticing that your nose is itchy or thinking about g and scientists can program machinery and software to respond to these signals 7 electrical impulses from the rest of your body Electronic sensors can detect these changes in the brain The most obvious and perhaps most important use of this new technology is to help people who are lo paralyzed or severely disabled For many people with diseases that affect the brain muscles or nervous system it is difficult or impossible to do things that most people take for granted such as smiling speaking 13may still be able to communicate or perform tasks that were previously impossible 2 or moving their arms or legs With brain controlled devices people who cannot move or speak on their own 11 Of course there are fun uses of this technology too Several toy companies around the world have Teleased games that rely on people concentrating doing things such as making a ball levitate with their lemind While the technology is still limited scientists are hoping that one day we will not need to use our hands to turn on an oven or our voices to talk on the phone it will all happen by just using our brains SKILL PRACTICE Read each question Fill in the bubble next to the correct answer 1 How has science fiction affected the development of brain controlled devices A Scientists worked from book and movie plots B Scientists were motivated to be superheroes Scientists were inspired by ideas and possibilities Scientists used these devices to do their work 2 Hearing a familiar song causes an increase in A oxygen to part of the brain volume on a music player software to detect brain signals O development of helpful technology STRATEGY PRACTICE 3 How do brain controlled devices work A Devices send electrical impulses Machines are implanted in people s brains Scientists mimic the movements of machines O Sensors record activity in the brain 4 What effect could a brain controlled device have on the life of someone with a disability It could cure the disability It could help the person communicate or perform tasks It could control the person It could prevent someone from using his or her hands Name a movie television show book or toy you are familiar with that includes a brain controlled device How does the device work

elect the chemical equation that is correctly balanced Pb NO3 aq KI aq Pbl s KNO aq NaBr aq AgNO aq NaNO aq AgBr s O 2 AL SO aq 4 NH PO aq BaCl aq Na SO aq BaSO4 s NaCl aq 4 AIPO s 4 NH4 SO4

X What is the number of moles of glucose CHO in 0 500 solution L of a 0 40

What is the mass in grams of NaCN in 120 0 mL of a 2 40 solution

Consider the C H g O g CO g H O g Select the coefficients that will properly balance the equation O2 13 8 10 01 3 4 1 2 4 5 1 7 4 5 O4 26 16 20

Ig 1 S s HgS s oxidation reduction decomposition single displacement combustion synthesis combination double displacement precipitation acid base neutralization Pb NO3 aq 2 Kl aq Pbl s 2 KNO aq synthesis combination single displacement double displacement combustion oxidation reduction acid base neutralization precipitation decomposition H SO aq Mg OH aq 2 H O 1 MgSO aq acid base neutralization synthesis combination single displacement decomposition double displacement combustion oxidation reduction precipitation Fe s Cu C H O aq Cu s Fe C H O 0000000 combustion precipitation double displacement single displacement oxidation reduction acid base neutralization decomposition synthesis combination 2 K s 2 H O 1 2 KOH aq H g combustion double displacement oxidation reduction synthesis combination single displacement precipitation acid base neutralization decomposition CH 6 1 120 g 8 CO g 16 H O g double displacement acid base neutralization synthesis combination oxidation reduction single displacement combustion decomposition precipitation