General Questions and Answers

3 points Balance the chemical equation for the reaction of sodium metal with chlorine gas to produce sodium chloride choose your answer Na choose your answer Cl choose your answer NaCl

Place the following in order of increasing radius 1 the smallest 5 the largest S 52341 53214 12354 14352 Na Ar Sc3 CI

A dose of aspirin of 5 0 mg per kilogram of body weight has been prescribed to reduce the fever of an infant weighing 12 5 pounds The number of milligrams to the nearest whole milligram of aspirin that should be administered is

The heat of fusion for water is 80 cal g How many calories of heat are released when 20 0 g of water at 0 C is frozen to ice

The Latent Heat of Fusion for water Lf is 80 cal g C How many calories are needed to melt 100 g of ice at C

An alkyne is an organic compound that contains a single double triple aromatic hydrogen bond

Which of the following numbers contains the designated correct number of significant figures 0 04300 5 significant figures 0 00302 2 significant figures 3 significant figures 2 significant figures 4 significant figures 156 000 1 04 3 0650

In a neutralization reaction two acids react to form water water and a salt react to form an acid and a base an acid and a salt react to form water and a base a base and a salt react to form water and an acid an acid and a base react to form a salt and water

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 1 7 g mL 0 59 g mL 0 587 g mL 45 0 g mL

How many grams of NO are required to produce 145 g of N 2 in the following reaction 4NH3 6NO 5N2 6H 20 Please show your work O 186 g 155 g 125 g 129 g 145 g

What is the symbol for the ion with 19 protons and 18 electrons F F Ar K

Rubbing alcohol is 70 m v isopropyl alcohol by volume How many mL of isopropyl alcohol are in a 1 pint 473 mL container

How many significant figures are in the number 0 00506 O six two three four five

Which element would have physical and chemical properties similar to chlorine Ar Br 000 OP

The H 30 of a solution with pH 9 7 is Molar

The beryllium 10 nuclide radioactively decays by beta emission Write a balanced nuclear chemical equation that describes this process X 3 Y

A 50 0 mL urine sample has a mass of 50 7 g The specific gravity of the urine is 1 014 g mL 0 986 g L 1 01 0 986 50 7

At STP what is the mass in grams of 13 0 L of methane CH4 Find moles of CH4 first Show your work

Points 2 Question 4 Which of the following questions should you ask yourself during the revision process O Do I use connectives when addressing counterclaims OIs my tone appropriately formal O Do I use connectives when introducing evidence and supporting arguments O All of the choices

If the temperature is 55 F what is the corresponding temperature on the Kelvin scale 225 K 218 K 55 K 273 K 328 K OOO

Valence electrons are electrons located in the outermost energy level of an atom in the nucleus of an atom in the innermost energy level of an atom throughout the atom in the first three shells of an atom 00

1 Balance the following redox reactions in an acidic solution using the oxidation number method A 2 Fe H NO3 2 Fe NO H O

Which statement is true about the excess reactant a It is not completely used up in a reaction c It is the substance with the largest molar mass d It is the reactant which has the most mass b It is always one of the products

Using data in Appendix E in the textbook calculate the standard emf for each of the following reactions H g F2 g 2H aq 2F aq Express the potential in volts to two decimal places E Submit Part B VAZO Request Answer Cu aq Ca s Cu s Ca aq V

Among 5 different species VO VO v V how many are stable in water under pH 0 Acidic solution 5 vo 1 000 01 02 03 4 VO 0 337 3 V 0 255 2 V 1 13 V

T 7 1 Quiz A Which particle diagram below best represents each chemical C Na O aq GMgBr s H NaOH aq A B E F D H aq AgBrO4 s issociation

Remdesivir is an antiviral medication that was approved in numerous countries for the emergency treatment of Covid 19 The medicine is industrially prepared and distributed as a solution of 5 0 mg of Remdesivir per 1 0 mL aqueous solution 5 0 mg mL If an emergency dose of 40 0 mL of solution is given to a patient using an intravenous technique how many moles of Remdesivir are delivered The molecular formula of Remdesivir is C27H35N6OgP Choose the closest answer 06 14x10 3 mol O3 32x10 4 mol 3 32x10 mol 08 30 10 3 mol 8 30 x 10 6 mol

Which of the following factors affect s the specific heat capacity of an Object 1 Temperature given 2 Nature of the object 3 Mass of the object 1 and 3 O 1 and 2 O 2 only 1 aphr

Which of the following molecules has more than one lone pair of electrons on the central atom OCC14 BrF 5

15 2AlBr3 3K SO4 KBr Al2 SO4 3 What mass of KBr is produced when 18 5 moles of K SO4 reacts

12 2Fe O3 3C4Fe 300 Calculate the number of moles of Fe2O3 needed to produce 2 16 g of Fe

Match the colors emitted by fireworks with their corresponding metal salts Metal Salts Color i Calcium chloride ii Copper chloride iii Sodium chloride a Yellow b blue c Orange Oi a ii b iii c Oi c ii b iii a Oi b ii c iii a Oi a ii c iii b

How much heat energy is required to melt 5 g of ice at its melting point AHfusion 334 J g O 200J 1750 J 10001

A 64 gram sample of O2 gas has a volume of 9 1 L and a pressure of 0 75 atm What is the temperature of the gas

Given the equation below 27 11 grams of Fe2O3 and excess CO what mass of CO2 can be produced Round your answer to two digits after the decimal point Fe O3 3 CO 2 Fe 3 CO2 Your Answer

a POSA 6 e 4 33 The che a a b b Assume C 2 3A c A d 1 2 B none d 4 Consider ti equilibriun 1 Add 2 Rem 3 Rem 1 and 2 1 and 3 2 and 3 e d All of 1 e Neither 1 b 1 19 x 10 4 8 43 x 103 1 33 104 e d e a b 0 26 e 2 1 d 38 e none of the above 13 For the reaction 2 A B the equilibrium concentrations are as follows A 0 056 M and B 0 12 M Calculate the equilibrium constant Keq for the reaction 2 6 10 Key C D D 07 9 378 b d none of the above 14 Reduction involves which of the following 1 Loss of electron s 2 Gain of electron s 3 Decrease in oxidation state 1 only 2 only X 3 only 1 and 2 only 2 and 3 only 2 082 shifts to the left shifts to the right 1 32 000430 BS For the reaction Ag2S s 2 Ag aq 2 aq what happens to the equilibrium position if aqueous ammonium sulfide is added b e does nothing d doubles halves uilibrium constant is P an acid Basic 3 441 ped on it te the Sulfuric is Hz 804 ralize

PAH O reduction 33 Write the concentration equilibrium expression for each reaction Keq of matter 1 point each a 2PbS s 30 2PbO s 2SO g 2 Key in Pb0 s0 1 Pbs 0 7 b CS s 4H g CH4 g 2H S g Keq CH4 H S CS 4 h Pay attention to the states products reactants 34 What would happen to the position of the equilibrium when the following changes are made to the reaction below 1 point each 2HgO s Hg 1 O2 g X a HgO is added to the system Shis b The pressure on the system increases Doubled X an isomer 7 12 comer uld equal paper with th id in the blar s acetic acid rous acid 20 ontium hydr OH

d the gain of water none of the above a b B 23 23 What is the molar solubility S of FeS if the Ksp 5 9 x 10 19 for this substance 1 2 10 18 M 5 9 10 19 M P ly Vedochun C 7 7 x 10 10 M d 3 5 x 10 37 M none of the above 2 b 227 3 M 24 Calculate the concentration of NO in an equilibrium mixture given that the concentration of N204 0 200 M and Keq 45 5 for the reaction 2NO2 g N2O4 g 0 0663 M I 0 00440 M e d 15 1 M munad baroqmos binol od to pottamuk O none of the above C NO 2 1 d N03 2 e NH3 stoldo molagation 067 25 Which substance below would contain a nitrogen atom with the highest oxidation number of all those shown NH 14 4 sniwoligt so ni b N 3 OnMiJ aper wit 1 in the acetic a us acid tium h H

Experiment Reactants 1 3 Does Magnesium reduce Zinc 2 g Mg s 150 mL Zn aq

21 For the reaction 2 H O 1 2H g O 8 the equilibrium expression is a Keq H O b C Keq H 2 0 H 0 H O 2 Keq H O d Keq H O 2 e none of the above 22 Oxidation typically involves the loss of electrons b the gain of electrons a

D 2 AgCl Ksp 1 77 10 10 d Agl Ksp 8 51 10 17 not enough information munditivos adi 9 ST USTES 7 In which compound does manganese have the highest oxidation state 2 a MnO 6 Mn Mn 03 KMnO4 C d e none of the above G a 0 017 11 b 0 018 58 d 55 e none of the above 1 951 T ll 15 18 Calculate the equilibrium constant for the reaction below given that Cl2 0 11 M H 0 15 M a HC 0 95 M at equilibrium Given Cl g H2 g 2HCl g dilante sai sultats ils 95 Z 19 Identify the equation for which Keq Cu 2 S Cut aq 25 ag enobross 700 wallat b Orxas

Experiment 2 Does Copper reduce Zinc Reactants 1 g Cu s 150 mL Zn aq

Which among the following is an example of a suspension Sugar in water Oxygen dissolved in nitrogen Carbonated water Clay in water

Experiment 5 Does Lead reduce Copper Reactants 4 g Pb s 150 mL Cu aq

A B none of the above the A The oxidation number of Cr in Cr O72 is A 2 7 6 d 2 a C8 For the reaction Co Cl CoCl which statement is TRUE a b C pa doleasingo muindiliapo sit sterenog bloow jari noitaupo lesinsdo od T hobrosos aidi ai 252 18 250sleduz le omuzzA AE 8 0 none of the above a b c d e 9 The effect of a catalyst is to The cobalt is oxidized because its oxidation state changed from 0 to 2 The cobalt is oxidized because it gained two electrons The oxidation state of each chlorine atom in Cl is 1 Each chlorine atom oxidized none of the above increase the number of collisions between reactants 3 AS AE d 5 8 A 8 10 In which compound is the oxidation state of oxygen not 2 a Al O3 b Li O increase the temperature of the reactants whereby more products are formed Lan change the position of the equilibrium vino E bas T change the stoichiometry of the reaction lower the activation energy of a reaction whereby making it easier for the reactants to get over the energy hump MgO Na O OMS aikoon silt sobiano Virgin edt of myindilimps Ork oom bbA J O svoms R be ar 7 of an acid 1 student B M2503 de is used D

Petunia needs 88 51 grams of potassium hydroxide KOH to run a reaction in class How many moles of potassium hydroxide does she need Please round your answer to two digits after the decimal point and remember to include correct complete units including substance formula Your Answer

How many moles of C6H12O6 are needed to produce 25 14 grams of CO Round your answer to three digits after the decimal point C6H12O6 6 O2 6 CO 6 H O Your Answer

A it would be an Arrhenius acid 10 Which of the following compounds is a weak acid a perchloric acid hydrofluoric acid A 16 Doesn t make sense send a Strong Strong B IS nitric acid A sulfuric acid vrwo

A 18 A 5 00 liter balloon of gas at 25 C is cooled to 0 C What is the new volume liters of the Alom balloon V 5 00 0 liters Tz a B 22 4 liters 5 46 liters 4 58 liters e none of the above A a 9 5 b 4 4 12 V d T c 19 How many moles of gas were added to a balloon that started with 2 3 moles of gas and a volume of 1 4 L given that the final volume was 7 2 L 1 4L 2 3 P V n 0 085 none of the above a 8 42 atm b 0 784 atm C 0 00842 atm d 7 84 x 10 4 atm none of the above V n C 25 C P put in cm 7 22 11 8 e oa bevem a 20 A sample of 0 255 mole of gas has a volume of 748 mL at 28 C Calculate the pressure of this gas R 0 0821 L atm mol K P 748 2556821301 0 C V 748 mL 748 n 255 mol Y 0821 T 28 C 301 k sures avo 0 To M 2 P 748 6 3015855 748 ow 11 avode od to 8 42

2 1 A chemical equilibrium exists when X a reactants are completely changed to products b there are equal amounts of reactants and products the rate at which reactants form products becomes zero d the sum of reactant and product concentrations equals one mole e the rate at which reactants form products is the same as the rate at which products form reactants 32