Please plz select the correct answer for each question! (steps won\'t be necessa
ID: 712471 • Letter: P
Question
Please plz select the correct answer for each question!
(steps won't be necessary)
Sodium chloride melts at 804 °C. Sodium iodide melts at 651 °C. The difference in melting points can be mainly attributed to:
Consider CH3CH2OH (ethanol) and CH3OCH3 (dimethyl ether). Which of the following statements is false?
How many compounds, of the four listed below, exhibit hydrogen bonding?
CH3CH2CH2NH2 CH3CH2NHCH2CH3 (CH3)2NCH2CH3 CH3CH2OCH2CH3
Which of the following statements is not supported by the data plotted below?
Consider the generic phase diagram below. Which answer best describes the sequence of events on starting at point A and going to point D?
A metal crystallizes in a face centered cubic structure and has a density of 12.02 g/cm3. If the radius of the metal atom is 137 pm, determine the Molar Mass and then search to match to identify the metal from the list below.
Consider the plot below. Which of the following is FALSE?
A student takes 400 mL of a 2.00 M aqueous solution of (NH4)2S and adds 400 mL of water. What is the concentration of NH4+ ions in the resulting solution?
Consider the mixture of two aqueous solutions: one of potassium phosphate and one of calcium nitrate. The net ionic equation for the process that occurs is:
The freezing point of 0.125 moles Na2CO3 dissolved in 250 grams of water is:
Which of the following statements is generally TRUE?
A solution of 100.0 mL with 2.00 g of a peptide dissolved shows an osmotic pressure of 0.980 atm at 20.0 °C. What is the molar mass of this peptide?
A student obtains a 10.0 gram sample of 131I (t1/2 = 8.00 days) which follows first-order decay. How long will it take so that only 3.00 grams of 131I remain?
Consider the profile below. Which of the following statements is correct?
Which of the following is true for a second order reaction having only one reactant?
Consider the following reaction mechanism:
What is the reaction intermediate in this mechanism?
Which of the following is NOT true about a catalyst?
Experiment
Initial [A]
Initial [B]
Initial Rate (M/s)
1
0.10
0.10
5.1
2
0.20
0.10
10.2
3
0.10
0.25
80.
What are the concentrations of ions in a solution prepared by dissolving 2.0 moles of ammonium sulfide in sufficient water to make 0.50 L of solution?
The larger iodide ion has larger dispersion forces. H2o 100°- HF H2Te 0° NH3 HzSe sbH3 HzS Ha SnH4 HBr PH3 -100° GeH4 SiH4 CH4 200° 20 35 80 130Explanation / Answer
Q no 1
Since both the compounds are ionic, We generally compare melting point of these compounds on the following basis :-
1.Charge of the cation /anion : More the charge of cation or anion, stronger will be the forces of attraction between the ions and higher will be the melting point.
Here charge on both compounds is same.
2.Ionic radii: More the distance between ions, lesser will be the strength of the bond giving rise to lesser melting point.
Here size of Iodine in NaI is large as compared to Chlorine in NaCl therefore lesser will be strength of bond in NaI. Hence lesser melting point.
Hence option (c) is correct
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