General Questions and Answers

11 Which of the following would decrease the rate of solution when dissolving a solid in water A Raise the temperature of the solution B Crush the solid before mixing C Stir the solution after mixing D Use a single cube of solid

A 11 1 g sample of a gas occupies 2 03 L at 775 torr and 25 0 C What is the formula mass of the unknown gas i g mol If the gas is an element which element is it Enter element symbol the answer is case sensitive

Consider the two molecules Hexane and cyclohexane below Which of these has the largest absolute entropy and why HHHHHH H C H H C HHHHHH Hexane H C H Hexane because it has a smaller number of microstates O Cyclohexane because it has a larger number of microstates C C C C H HH HH Cyclohexane OCyclohexane because it has a smaller number of microstates O Hexane because it has a larger number of microstates H C H C H H

b What is the mass in grams of 0 0287 mol of iron III phosphate 9

What would you predict as the temperature dependence for the following chemical reaction 3H2 g N2 g 2NH3 g O This reaction does not occur at any temperature O This reaction occurs at any temperature O This reaction is more likely to occur at higher temperature This reaction is more likely to occur at lower temperature

4 The temperature of a sample of titanium increases from 30 C to 71 8 C as it absorbs 5771 joules of heat What is the mass of the sample Specific heat of titanium is 0 523 J g C

Current Attempt in Progress In one lab the gas collecting apparatus used a gas bulb with a volume of 223 mL How many grams of CaCO3 s need to be heated to prepare enough CO g to fill this bulb to a pressure of 794 torr at a temperature of 23 C The equation is CaCO3 s CaO s CO g

3 Balance the following dox reaction 7 8 1 6 4 2 2 2 0 5 8 2 2 6 MnO4 aq SO3 aq MnO s SO4 aq SO32 504 20 R

Your di A sample of carbon dioxide has a volume of 28 mL at 28 C and 629 torr How many grams of CO2 are in the sample i 0441 g CO

Procedure 1 Select two compounds in Group 1 two compounds in Group 2 and two compounds in Group 3 tc use in experiments 1 2 and 3 You will focus on these six compounds in all three experiments or activities in today s lab Group 1 1 CH4 2 PC13 3 PCI s Group 2 1 2 3 CO NH3 H O Group 3 1 BH3 2 3 BeCl CH3OH

12 Approximately how many times will your heart thump over the course of your life A 3 Zillion B 3 Million C 3 Trillion D 3 Billion

1 How many muscles does your body use each time you take a step A 400 B 300 C 200 D 100

the interactive to observe how the pressure changes when the volume 0 Volume Amount of gas Temperature Pressure 2 7 atm 2 38 15 L 1 5 mol 323 K What is the pressure in atm of 1 4 moles of gas at a temperature of 353 K and a volume of 17 L

a Give the IUPAC names for the following compounds OH

Thinking about Earth what factors do you think generate these regular climate cycles

Find the Molarity of the concentrated HCI if you know that its density is 1 19 g mL and it contains 37 wt HCI

a Give the expected hybridization of the central atom of SC1 b Give the expected hybridization of the central atom of PC1 and drop your selection from the following list to complete the answer dsn 188 sn 3 sn d sp 3

1 Proton 2 Neutron 3 Electron 4 Nucleus 5 Atom Milk in water Vinegar in water Sand in water Oil and water 1 If it gets cold 2 If it gets hot 3 Condensation a b 4 Vaporization 5 If it absorbs heat 5 If it releases heat Melting Freezing 0 Positively charged particle in the nucleus of the atom The smallest part of an element or molecule Negative particles in the nucleus of the atom d Negatively charged particle that exists in the space around the nucleus Solution So Colloid C Suspension Sp e Particles with no charge that exists in the nucleus of most atoms Center of the atom contains most of the atom s mass f Doesn t settle scatters light Doesn t scatter light or settle Settles and scatters light Fog Milk Endothermic or Exothermic 1 Atomic Number 2 Molecule 3 Compound 4 Mass Number neutrons in the nucleus of an atom b Number of protons in an atom also the way the elements are numbered An atom with a different number of neutrons Two or more elements combined Two or more atoms that are C d e combined f 5 Isotope Number of electrons in an atom The temperature at which a solid turns to liquid is called The temperature at which a liquid turns to a gas is called The temperature at which a gas turns to liquid The temperature at which a liquid turns to a solid When a solid turns straight to a gas is called At what temperature does water melt At what temperature does water boil Give the group family name for the following groups on periodic table Group 1 Group 2 Group 13 Group 14 Group 15 Group 16 Group 17 Group 18

How does the conclusion of a narrative essay differ from the conclusion of other essays OIt tells an interesting story OIt summarizes the main ideas O It does not summarize the main ideas

Scenario 6 6 9 g of sodium carbonate solution is placed in a test tube containing a 5 0 g sample of hydrobromic acid Balanced Chemical Equation Write the balanced chemical reaction by completing the table below For each of the product determine what the product will be and place it in the appropriate blank For example for the reaction of strontium chloride and sodium iodide for the strontium product type in the formula of the product that contains Sr Likewise for sodium product type in the formula of the product that contains Na Please remember to 1 Write the correct coefficients for all reactants and products 2 Write the correct states for all reactants and products Remember Do not write 1 s in balanced equations 3 Write NO RXN for each product if a reaction does NOT occur DO NOT worry about formatting subscripts Thus if two moles of aqueous strontium hydroxide please type it as 2 Sr OH 2 aq DO NOT a space between the formula and the state of the compound such as 2 Sr OH 2 aq DO add a space between the coefficient and the formula such as 2 Sr OH 2 aq

From numbers 9 to 15 refer to the following chemical reaction Cr O7 12 Cr 11 The total number of electrons gained in the oxidation reaction under acidic media is a 6 b 2 c 12 d 3 e None of the choices 12 The total number of electrons lost in the reduction reaction under basic media is a 6 b 2 c 12 d 3 e None of the choices 13 The total number of coefficients if the reaction is balanced under acidic media is a 21 b 12 c 33 d 40 e None of the choices 14 The total number of coefficients if the reaction is balanced under basic media is a 14 b 19 c 33 d 40 e None of the choices 15 The number of electrons gained lost in the reaction is a 2 b 3 c 6 d 10 e None of the choices

6 Consider the following reaction 3 Na S 2 AIF Al S3 6 NaF A student combines 35 9 mol Na S with 27 9 mol AIF and they react a What is the limiting reactant b How much NaF will be produced BO flip to the back side

Dichlorine pentoxide decompose to form chlorine gas and oxygen gas according to the equation 2Cl2O5 2Cl2 502 What amount of oxygen is produced from the decomposition of 6 2 mol of dichlorine pentoxide 2 48 mol 31 0 mol 15 5 mol 12 4 mol

A nucleus of Uranium 235 that reaction undergoes alpha decay Write the decay equation fo

2 How many muscles cover the body A 250 B 650 C 350 D 550 Highlight the correct answer

Possible Lewis symbols for several atoms and ions are shown below Select all Lewis symbols that are drawn correctly A O Al B O Lit C D Ar Al L 3 r Select all that apply 8 points

When the following carbohydrate cyclizes which of the following Haworth Projections is formed HO H H CH OH 0 H OH OH CH OH

Fusion requires extremely high temperatures to begin because 1 electrons interfere with the process 2 releasing more energy requires a greater input of energy first 3 positive nuclei repel each other 4 nuclei without neutrons can t create larger nuclei that DO contain neutrons 5 hydrogen and helium are gases

Which of the following phase changes would you predict to have the largest NEGATIVE change in entropy O H O s H O 1 O H O H O s O CO2 g CO2 s H 011 H O g

Hydrogen has an electronegativity value between boron and carbon and identical to phosphorus With this in mind rank the following bonds in order of decreasing po decreasing polarity Drag and drop your selection from the following list to complete the answer C H 0 H N H P H F H

What is the votal number of molecules reacting 6 Recheck 22nd attempt X Next 4 of 7 Incorrect

14 What percentage does muscle provide for warmth A 55 B 65 C 75 D 9504

Hide Full Description Find the structure of a common prescription drug on Wikipedia google etc and tell me what functional groups are in the struc

2 The temperature of a sample of iron with a mass of 10 0 g changed from 50 4 C to 25 0 C with the release of 197 J of heat What is the specific heat of iron in J g C

5 What does the cardiac muscle attach to A The tendons and bones B The heart C The blood vessels

25 g of chlorine reacts with 18g of sodium What mass of sodium chloride results More Stoich

In a certain zinc copper cell Zn s Cu aq Zn aq Cu s the ion concentrations are Cu 0 0235 M and Zn 1 9 M What is the cell potential at 25 C 11 V

What is the pH of a 0 250 M solution of oxalic acid Ka 5 6 x 10 4

1 Answer these questions based on the results and data analysis for the Derivation of a Gas Law Experiment USE THE SPECIFIED GUIDELINES FOR ROUNDING DO NOT INCLUDE UNITS IN YOUR ANSWER Your grade out of 10 on this assignment will be added to your grade out of 90 for the report submission to give you an overall grade out of 100 2 points Determine the molecular mass of a gas where 2 19 g occupies 0 99 L at standard conditions of temperature and pressure to THE NEAREST WHOLE NUMBER To

Which of the following is the correct Lewis structure for CaCl A O B O C O d ca C ci Ca Cl Select one answer 5 points

The antibiotic thiarubrine A was discovered by studying the feeding habits of wild chimpanzees in Tanzania The structure of thiarubrine A 1 2 3 4 H3C C C C H 1 S 1 H C6 2 C CEC CEC CH CH 10 11 12 7 8 9 How many n bonds are in thiarubrine A 13

1 point Convert the value for R 0 0661 L atm mol K 1 to one that has units of J mol K ROUND ANSWER TO 2 DECIMAL PLACES DO NOT INCLUDE UNITS 1 L atm 101 325 J 1 cal 4 184 J

Draw the Lewis Structure for each species below Then for each species determine i its electron group geometry ii its molecular shape iii whether the species follows the octet rule is electron deficient or has an expanded octet iv whether the species exhibits resonance i electron group geometry ii molecular shape iii octet rule NI C 2 CO Fill in the blanks by sele one option from each me aby Part 1 3 points ab Part 2 3 points ab Part 3 3 points ab Part 4 3 points ab Part 5 2 points ab Part 6 2 points aby Part 7 2 points ab Part 8 2 points 20 points

2 points Which of the following could cause your R value to be higher than the literature value for the constant MORE THAN ONE ANSWER CAN BE SELECTED pressure is too high temperature of gas is too low volume too high mass of metal is too low volume too low mass of metal is too high pressure is too low temperature of gas is too high

How many liters of a 0 209 M KI solution is needed to completely react with 2 43 g of Cu NO3 2 according to the balanced chemical reaction 2 Cu NO3 2 aq 4 Kl aq 2 Cul aq 1 s 4 KNO3 aq

1 The Hellenistic World was made up of Greece Southwest Asia and Egypt

Draw the Lewis structure for each species below Then state i the electron group geometry ii the molecular shape iii the approximate bond angle and iv whether the species follows the octet rule is electron deficient or has an expanded octet i electron group geometry ii molecular shape iii bond angle iv octet rule SF 1 XeF Fill in the blanks by selec one option from each me ab Part 1 3 points ab Part 2 3 points ab Part 3 3 points ab Part 4 3 points ab Part 5 2 points aby Part 6 2 points aby Part 7 2 points ab Part 8 2 points 20 points

How much di chloro benzene could she have made with the 10 grams of benzene

ON ON ONION AND 17 1500 STABLE NET ZERO sucrose C12H22O11 0 Cation Max 1500g 19 48 d 0 1g AND 1 1500 STABLE NET O ZERO ON OF potassium carbonate Max 1500g 317 Ci ig 3 What type of particle entity is present in your sample 4 Calculate the number of particles entities present in your vial Make sure you include the correct entity in your units 2 marks 5 Depending on your sample type calculate the number of each ION in your vial 4 marks d 0 1g 1 mark

A organ system is a group of organs and tissues that work together to perform important functions in the body Some are in more than one system There are skeletal major body systems within the human body system cardiovascular nervous urinary and the systems respiratory