Chemistry Questions and Answers July 23, 2020

Which one of the following is a balanced chemical equation? a. H 2 + O 2 ?H 2 O b. 2 KHCO 3 ? K 2 CO 3 +H 2 O c. NH 4 NO 3 ? N 2 O + 2H 2 O d. H 2 SO 4 + Ba(OH) 2 ?BaSO 4 + H 2 O

The maximum solubility of silver cyanide, AgCN, is 1.5x10-8 mol/L at 25 degree celsius. Calculate Ksp for silver cyanide. Pls. show all the steps.

QUESTION 5 Not yet answered Marked out of 2.00 P Flag question The main advantage of fluorescence over UVVis spectroscopy is Select one a. Its sensitivity because fluorescence is measured by attenuation of incident light against zero background Ob. Its sensitivity because fluorescence is measured against zero background O c. Its compatibility with

How much heat 18.14g NH4N2(g)+3H2(g) -------> 2NH3(g) ?H= -91.8 kJ

The osmotic pressure of blood is 7.65 atm at 37 ?C. What mass ofglucose (C6H12O6, molar mass = 180.2 g/mol) is needed to prepare5.00 L of solution for intravenous injection? The osmotic pressureof the glucose solution must equal the osmotic pressure of blood.(R = 0.08206 Latm/molK)

What is (are) the product(s) of the following reaction (CH,CH2),NH mild acid heat N(CHCH)2 I only Il only III only II and III N(CHCH)2 N(CHCH)2

Assume that you are growing 2.5 L of E. coli, the volume of 1000X ampicillin required to add to the growth medium sis 2.5 L 25 L 2.5 mL 25 mL

KINETICS OF THE DECOLORIZATION OF CRYSTAL VIOLET BY SODIUM HYDROXIDE PRELABORATORY QUESTIONS The following preparatory questions should be answered before coming to lab. They are intended to introduce you to several ideas that are important to aspects of the experiment. You must turn in your work to your instructor before you will be allowed to

which one of the following is a buffer solution? a) 0.40 M HCN and 0.10 KCN b) 0.20 CH3COOH c) 1.0 M HNO3 and 1.0 NaNO3 d) 0.10 M KCNe) 0.50 M HCl and 0.10 NaCl

What is the oxidation state of nitrogen in HNO Important If the oxidation state is fractional, enter your answer as a fraction, not as a decimal number (eg. enter 12, 13, 14, 23, etc. not 0.5, 0.33, 0.25, 0.67, etc.) Number

3 21,420 80 F3 4 000 000 F4 Which one of the following is a strong base A) Mg(OH)2 B) Ca(OH)2 C) NH3 D) CH3OH 25 10 S FS 6 1174 MacBook Air F6 7 44 F7 8 DII F8 ( 9 DD F9 ) 0 A F10 1 4 F1

Which one of the following mixtures is not asolution? a. white vinegar b. clear tea c. bottled spring water d. pulpy orange juice e. filtered dry air

Which one of the following cannot act as a buffer solution? 1.0 M KCl and 1.0 M HCl 0.40 M HNO 2 and 0.10 NaNO 2 0.10 M HC 2 H 3 O 2 and 0.10 MNaC 2 H 3 O 2 0.20 M NH 3 and 0.25 MNH 4 Cl 0.50 M HCN and 0.10 NaCN

A noncompetitive inhibitor has a structure that Select one a. does not interfere with the enzymesubstrate complex formation b. does not resemble the substrate structure c. resembles the active site of the enzyme d. can bind to the active site of the enzyme

A sample of neon gas occupies a volume of 6.55 L at 55.0C and 350. torr. If the volume of the gas sample is increased to 7.86 L, while its temperature is increased to 114.0C, the resulting gas pressure will be torr.

A heliumfilled weather balloon has a volume of 898 L at 19.9C and 753 mmHg. It is released and rises to an altitude of 3.06 km, where the pressure is 587 mmHg and the temperature is 0.9C. The volume of the balloon at this altitude is L.

Which one of the following is a strong electrolyte (a) KF (b) HO (c) HF (d) HNO (e) (CH3)3N

Match the pKa values of the following compounds CH3CHCOOH CH3CHCHOH Choose... CH3CHCHNH Choose... CH3CHCHNH3 Choose... Choose...

Please compare viscosities of these three molecules with detailed explanation.

nbtil alkol primer H ROOH H OH OH isobtil alkol sekonder H RCOH R OH x neobtil alkol tersiyer R3 RCOH R

Which one of the following is a conjugate acidbase pair HO and HO2 HI and I HNO3 and HNO2 NaF and F NH4 and NH

How many distinct monochlorinated products, includingstereoisomers, can result when the alkane below is heated in thepresence of Cl2? 1, 2, 3, 4, or 6?

Which one is the balanced chemical equation for the AH for H3BO3(s) O 3H(g) B(s) 30(g) H3BO3(s) OH(g) B(s) O(g) H3BO3(s) OH3BO3(s)2H(g) B(s) 2O(g) OH(g) B(s) O(g) H3BO3(s)

Predict the final product(s) of the following reactions

NO 1) Ch, Fe 2) H, Fe 3) NaNO, HO 4) CuCl NHCH HNi OH

Q1. How to remove Highlighter marks on the book? Q2. How Does Lemon Erase Highlighter?

What is the pH of a solution of 1 x 10 -9 M HCL? Answer: slightly less than 7 Why is the answer less than 7 and please when you answer this question please explain with the reaction?

Molecule of study: K3[Co(C2O4)3] a) Write down the IUPAC name, the oxidation state and electronconfiguration of the transition metal. [3 marks] b) Draw the molecular orbital (MO) diagram of the coordinationcomplex to represent the sigma bonding. [5 marks] c) Use orbital and symmetry symbols to label energy levels andassign electrons to the energy

Part 1: A solution of sodium thiosulfate,Na 2 S 2 O 3 , is 0.0932 M. 25.00 mL ofthis solution reacts with 15.37 mL of I 2 solution.What is the molarity of the I 2 solution? 2(Na 2 S 2 O 3 ) + I 2 ?Na 2 S 4 O 6 + 2(NaI) Part 2:As 2 O 3 + 5(H 2 O) + 2I 2 ?2(H 3 AsO 4 ) + 4HI33.35 mL of theI 2 solution from above is required to titrate asample

Nucleons The term nucleon refers to the particles found in the nucleus of an atom, namely protons and neutrons. A single hydrogen atom (one proton plus one electron) has a mass of 1.007825 amu. A single neutron has a mass of 1.008665 amu. Note that amu stands for "atomic mass unit" and is sometimes abbreviated with the symbol u. Mass Defect The

Which one of the following is the strongest acid? How did youget your answer? a. 1 b. 2 c. 3 d. 4 e. 5

CHCHCH CHCHCHCOH CH3CHCHCOH CH3CHCHCOH CH3CHCHCOH CHCHCOH CH3CHCHCOH 1 CH3 2 F 3 CI 4 Br 5

Iron is found in Earths crust as several iron compounds. Calculate the mass (in kg) of each compound that contains 7.8 x 10 kg of iron. Y Part A FeO3 (hematite) Express your answer in kilograms to two significant figures. Mass Submit 5 Request Answer B,Part B Fe3O4 (magnetite) Express your answer in kilograms to two significant figures. Mass

Q- 0.24 g of a volatile gas, upon vaporisation, gives 45 mL vapour at NTP. What will be the vapour density of the substance? (Density of H2 = 0.089 g/L) (a) 95.93 (b) 59.93 (c) 95.39 (d) 5.993

13. Which of the following compounds have plane of symmetry HC CH3 H3C CH3 (b) CI. CI CI C (d) Br ICH CI

14. The molecule that has formula C,H, with 2 sp Cs, 2 sp Cs, and 1 sp C and chiral isomer is H CH3 CH3 (a) (c) H H HC H CCC CH 3 CCC H CH3 (b) (d) HCC H HCCCC CH3 H CHCH3

15. In which of the following compounds plane of symmetry and center of symmetry both are present , CI H OH OH (a) (c) CH3 H Br CH3 H Br (b) (d) C CI

16. Cis and trans2methyl5tbutyl1, C(CH3)3 for CH3 cisP H3CC(CH3)3 3dioxane each can exist as two conformers as shown below HC cisQ CH3 C(CH3)3 C(CH3)3 transR transS The preferred conformations for the cis and transcompounds will be (a) P and R (b) Q and R (c) S and R (d) Q and P

17. Which of the following pairs of compounds are identical CI wf CH3 (a) F CH3 Br A H Br (c) F CH3 CH3 H Br F Br H H (b) (d) H H H H CI I HI H H H

18. Which of following compound will rotate the plane polarized light at room temperature 33 (c) (b) (d)

19. Which of the following best explains the reason for the relative stabilities of the conformers shown CH CH3 H. (1) H H H H. (II) H CH3 (a) I has more torsional strain. (c) II has more torsional strain H CH3 H (b) I has more steric strain. (d) II has more steric strain.

20. Most stable conformer of compound (a) F H (b) F H H2COH H2C F OH is (c) H H H (d) H F H OH H

21. How many meso isomers are (a) 2 (b) 3 possible for the following compound (c) 6 CI Cl (d) 4

23. Chiral and optically active molecule among the following molecule is, Me H H H (a) I, II H CCC II (b) II, III Me H CCC III (c) II only H (d) I only

24. The absolute configuration of the asymmetric centres in the given molecule is OH CI (a) IR, 2S C6H5 H H CH (b) IS, 2R (c) IR, 2R (d) IS, 2S

25. Cyclo hexane1,3diol has been shown to have (a) the diaxial orientation (c) the axial and equatorial orientations (d) None (b) the diequatorial orientation

26. Which conformation is more stable of 2 fluroethyl trichloro acetate. F H H (c) H H F H H CCI 0 FOCCH3 HH (b) H. H H (d) H H H CCC13 FH H 0CCCI3

27. The total possible stereoisomers of the given compound CH 3 (a) two (b) three H (c) one (d) four

28. Which conformer is identical to the given conformer (a) (b) (d) None

29. Determine the absolute configuration of the molecule Br CI OCH 3 OH (a) along axis, R (c) along chiral centre, R (b) along axis, S (d) along chiral centre, S