General Questions and Answers

What is the formula for carbonic acid A H CO3 B H SO4 OC HNO OD HNO3 E HCI

An element with the electron configuration noble gas ns n 1 d 0np3 has electrons 02 0 3 05 O 10 O 15 valence

An unknown substance dissolves in water but separates and floats in oil Substance Water Oil Chloroform Ammonia Gasoline Polyethylene Chloroform Ammonia What is the identity of the unknown substance Gasoline Bond Type Polyethylene Polar covalent Nonpolar covalent Polar covalent Polar covalent Nonpolar covalent Nonpolar covalent Density 1 0 g mL 0 91 g mL 1 49 g mL 0 73 g mL 0 70 g mL 0 98 g mL

Exercise F Write equations for dissolving strong and weak bases Water is a reactant in the dissolving process when a weak base or a base which does not contain a hydroxide ion dissolves Write equations for the ionization of the following bases in water Solid Mg OH 2 a strong base Solid NaOH a strong base Gaseous NH3 a weak base tol OpH norit anoi 110 ALOE esteet bna zbioc poin

1 point What is the solvent in engine coolant containing 70 C H6O2 1 and 30 H O OC H602 O Water Coolant

The T 356 60 C Tm following information is given for mercury at 1 atm AHvap 356 60 C 295 6 J g AHfus 39 00 C 11 60 J g Submit Answer 39 00 C Specific heat solid 0 1410 J g C Specific heat liquid 0 1390 J g C A 37 40 g sample of solid mercury is initially at 59 00 C If the sample is heated at constant pressure P 1 atm Try Another Version References Use the References to access important values if needed for this question 1 item attempt remainin kJ of heat are needed to raise the temperature of the sample to 78 00 C

7 agos iros galio Calculate the molarity of a solution that contains 966 grams of potassium carbonate K CO in 50 0 liters DICE of water The molar mass of K3CO3 is 138 mol as nosaurus

5 1 point What is the solvent in Cranberry apple juice O Cranberry juice O Water Apple juice

Tap the arrows to set the value for the oxidation state chlorine

References What is the maximum number of electrons that can be identified with each of following sets of quantum numbe there are none enter 0 1 a n 4 l 0 me 0 m 2 2 b n 6 1 m 1 6 C n 3 10 d n 3 3 0 Submit Answer Try Another Version

How do we measure the difference in the energy of the reactant and product a Temperature b The size of the reactants and products c Heat d Number of molecules

e Predict what would happen to the Earth s temperature if there were no greenhouse gasses

on Al Tap the arrows to set the value for the oxidation state aluminum

On a spring morning 16 C you fill your tires to a pressure or the tire heats up to 37 8 C from the friction on the road What is the pressure in your tires now Give your answer in 2 decimals Question 9 2 pts Boyle s Gas Law A 500 0 mL sample of a gas at 3 9 atm pressure changes to a volume of 1 3 L What is the new

1 2 3 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 Fe Fe Pt CaO MgBrz NHANOI NaCl Al Na Mg Na2CO3 Mg H CO AgNO3 H O2 FeSO4 Na O C4H10 CeHe Cu S Be 1 Cr3Sb2 NH OH K N Na COCO NO NaOH CH4 HBr CaCO3 0 HCI St Mg3P 27 Fe2O3 12 O2 H O Cla N H SO4 P Cl 02 H O O2 02 MgO CaCl2 CaCO3 N ZnCl S S H O NH4 2S H O FexO FeCl H 02 PtSa Nal 02 Al2O3 K FeCl3 Mg3P HCI COO H SO4 Al O3 CO Ca OH 2 MgCl2 Brz H O H SO4 Mg 02 Be3N Na2SO4 HCI Fe CUS NO N CO CO NaOH AgCl P Na S CO FeS Cr OH 2 CO AlBr3 H O NH4Cl H O Na2SO4 H O CaSO4 Zn NO3 2 NaCl NH4 2SO4 H O SbH3 Fe OH H O H2O CO2

m 8 When a 351 g piece of silver metal is heated from 24 5 C to 123 C the metal absorbs 8 19 kJ cal of heat Calculate the specific heat of silver in g C q Smst solve for D 6 1kfn ikt use M 1230 2415 8 19

What is the effect on the volume or an doubled Edit View Insert Format Tools Table 12pt Paragraph v V gas B BI I UAV T V there will be no effect on the volume It remains unchanged

What is the relationship between pressure in atm and torr

A patient having radiotherapy uses radioactivity to kill infected cells while trying to minimize the effect on the healthy cells True False

17 How much energy would be required for photosynthesis if 5 0 mol of carbon dioxide are available to react 6H 0 1 6C0 g C6H 2O6 s 60 g AH 2803 kJ mol change TA Over time s O mol co reation raters the Ok a product Din contention in trime A rate the co final contato intal final timo intal

A chemist determines by measurements that 0 0750 moles of oxygen gas participate in a chemical reaction Calculate the mass of oxygen gas that participat Round your answer to 3 significant digits 0 118 x10

Chemical Equations Activity Purpose To gain an understanding of a balanced chemical equation Direction On the sheet of paper 1 Write the equation assigned to you and then balance this equation 2 Draw the balance equation 3 Write the number of atoms of each type on the left and the right of the equation Explain the law of conservation of mass by using complete sentences referring to the number of atoms in your equation 4 Identify and explain the type of reaction Fe OH Fe H

10 8 Calculate the H3O for the 0 10 M CH3COOH solution with a pH 4 34

3 points The weak acid HCN has K 6 2 x 10 10 Determine the pH of a 4 275 M solution of HCN Report your answer with 2 places past the decimal point Type your answer

Convert 59 6 C to Kelvin Give your answer in 1 decimal

Select the sets of conditions that will produce a spontaneous process AG 0 Select all that apply Incorrect responses will be penalized AH 0 AS 0 low temperatures AH 0 AS 0 all tempeartures AH 0 AS 0 all temperatures AH 0 AS 0 low temperatures

3 points If the intensity of radiation from a radioactive sources is 4 3 units at a distance of 7 7 m how many meters from the source would you have to move to reduce the intensity to 0 33 unit Report your answer in whole number Do not put unit in your answer Type your answer

7 MODEL Draw a model with explanations showing how you think hurricanes form

32 3 points The rest mass of a proton is 1 0072737408 u and that of a neutron is 1 0086643921 u The 1271 nucleus weighs 126 933958 u Calculate the mass defect of the nucleus in amu Report your answer with 5 places after the decimal point Do not report unit in your answer

The rest mass of a proton is 1 0072737408 u and that of a neutron is 1 0086643921 u The 1271 nucleus weighs 126 933958 u Calculate the mass defect of the nucleus Report your answer with 5 places after the decimal point Do not report unit in your answer

Hydrogen atom wave functions contain 4 distinct quantum numbers QN Which of the following statements is not correct a the principal QN n is the sole determining factor of the energy b the orbital angular momentum QN I determines the subshell energy c the magnetic momentum QN mi represents z component of orbital angular momentum d the spin QN ms can only be or e all orbitals with the same principal QN have the same number of nodes

10 9 Name the following acids to zbias el g ne KH PO4 HCI HCN H SO4 2

The effort to build an atomic bomb during WWII was prompted by a fear that Germany was already working on nuclear weapons True False

How do the ionizing power and penetrating power of beta particles compare to other types of radiation A Beta particles have low ionizing power and high penetrating power Beta particles have low ionizing power and low penetrating power B C Beta particles have intermediate ionizing power and penetrating power Beta particles have high ionizing power and high penetrating power D Beta particles have high ionizing power and very low penetrating power E OC A

Vvital is the at constant pressure Give your answer in 1 decimal Question 13 2 pts Combined Gas Law What is the volume of 6 6 moles of carbon dioxide at 29 1 C when 1 mole has a volume of 22 38 L at 0 C

Rank the following compounds from lowest bottom to highest top boiling point There is no partial credit for this problem Highest boiling point 1 2 3 CH3 CH2 CH2 CI CH3 CH2 CH2 CH3 CH3 CH2 CH2 NH2 Lowest boiling point

Give your answer in 3 significant figures Question 18 Molar Density What is the density of Ne at 28 C and 1 4 atm

Exercise E Write equation for dissolving strong and weak acids When do you use the double arrows in dissociation equations Write equations for the ionization of the following acids in water Use a double headed arrow to indicate a weak acid Liquid HNO3 a strong acid Gaseous HCI a strong acid Gaseous HF a weak acid

A 40 0 L tank of ammonia has a pressure of 12 7 kPa Calculate the volume of the ammonia if i pressure is changed to 8 4 kPa while its temperature remains constant 60 48 L

Select the conjugate acid base pairs Select all that apply incorrect choices will be penalized H SO3 HSO3 HC H3O2 H C H3O2 H SO4 H SO3 HF F HCIO CIO H3PO4 HPO4 2

Which nuclear equation accurately represents the beta decay of Pb 208 A 208 Pb 20 Tl e 81 B 209 Pb 204Hg He 82 80 C 208 Pb 208 Bi e 83 D 209 Pb e 208 Tl 82 81 C OA B

10 2 Write the formula for the conjugate acids of the following BL Bases HPO4 2 CH3NH2 OH HCO

Select the compounds that you would expect to be soluble in water Select all that apply incorrect choices will be penalized CH3NH2 HF CBr4 CC14 CH OH

Write a net ionic equation to show that trimethylamine CH3 3N behaves as a Bronsted Lowry base in water BL base BL acid H O BL acid BL base

Exercise G Neutralizations equations Write neutralization equations for the reactions between the following acids and bases Here all of the compounds are assumed to be in water and therefore the aq symbol has been omitted for clarity and space Sulfuric acid and ammonia Hydrochloric acid and magnesium hydroxide Sulfuric acid and sodium hydroxide Nitric acid and potassium hydroxide Phosphoric acid and sodium hydroxide

What role did Marie Sklodowska Curie play in the discovery of radioactivity She has discovered two new elements that were both radioactive She has discovered the strontium element She has discovered the decay of the uranium nucleus She has discovered the uranium element

Exercise C Characteristics of acids and bases Indicate whether the following characteristics describe and acid A or a base B 101 enottsupa sthW 5 A B Tastes bitter 6 A B A B Turns red litmus blue A B Contains more H3O ions than OH ions A B Tastes sour A B Contains more OH ions than H3O ions Neutralizes acids 7 A B Turns blue litmus red 8 A B Neutralizes bases

d changing the temperature What is always product of an acid base neutralization reaction a water b OH c H3O d gas An aqueous solution with a pH of 8 would have H n OH

Exercise B Dissociation of strong weak and non electrolytes Write an equation for the dissolving of the following solutes in water Indicate whether the resultant solution will have mainly ions molecules or both lons molecules or both circle one Glucose C6H12O6 a nonelectrolyte Equation describing the dissolving of the solute 01 0 oil tenaitulo NaOH a strong electrolyte Equation describing the dissolving of the solute mun eit an emse odreus NH3 a weak electrolyte that also a base Equation describing the dissolving of the solute K2SO4 a strong electrolyte Equation describing the dissolving of the solute insoone Vintoms lons molecules or both circle one suley Hq enladost lons molecules or both circle one lons molecules or both circle one

An acid when dissolved in water will 1 point increase the number of ions O hydroxide O hydronium A base when dissolved in water will increase the number of ions O hydroxide O hydronium O an acid 1 point An unknown liquid has a slippery feel 1 point to it It is most likely