I have an assignment of Chemistry, May you help me pleas

Anonymous
timer Asked: Nov 23rd, 2018
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Question description

Worksheet #9: Solids & Liquids Name:_________________________________________________ Chem 1104 Fall 2018 You MUST show all your work to receive full credit!!! 1) Use the reference information at the end of this worksheet to calculate the amount of heat that must be removed to freeze 235 g of mercury. 2) Use the reference information at the end of this worksheet to calculate the amount of heat that must be removed from a 123 g sample of mercury to reduce its temperature from 400°C to 300°C. Mercury boils at 357°C. 3) Use the reference information at the end of this worksheet to calculate the amount of heat that must be added to melt 15 kg of lead if you begin at 25°C. Lead melts at 328°C. Hint: you must first heat the lead and then melt the sample. 4) Calculate the amount of heat required to vaporize 15 g of Al. Assume the sample is already at the boiling point of Al (78.37°C) 5) Consider the strengths of the possible intermolecular interactions and rank the following substances/mixtures by their boiling points: H2O, CH4, and CH3OH Highest Boiling Point Lowest Boiling Point __________________ ______________________ ________________________ 6) Benzene (C6H6) and toluene (C6H12O) have many commonalities but benzene boils at 80.1°C and toluene boils at 110°C. Which of these substances has the stronger intermolecular interactions. 7) Use the reference information at the end of this worksheet to determine which metal listed will require the most energy to vaporize a 10 g sample. Hint: No calculations needed to answer this question. 8) Use the reference information at the end of this worksheet to calculate the heat required to raise the temperature of a 75 g sample of H2O from −20°C to 120°C. Think carefully about this problem and what will happen to this sample as it is heated. 9) Why are dipole − dipole interactions stronger than induced dipole – induced dipole interactions? 10) Consider the atom sets below and circle ALL the sets that meet the requirements for forming hydrogen bonds. a. C H O b. N H O c. N H N d. F H O e. Si H O f. O H Se Substance Specific Heat (J/g°C) ΔHvap (kJ/mol) ΔHfus (kJ/mol) Water solid 2.03 liquid 4.184 40.6 6.01 gas 2.0 Lead solid 0.13 178 4.77 Iron solid 0.449 347 13.8 Mercury liquid 0.14 59.11 2.29 gas 0.1036 Aluminum solid 0.897 293 10.7

Tutor Answer

yourfavoritetutor
School: Rice University

Hi Dude 😎 , the attached are files for the assignment. Go through them and inform me if any corrections and edits are required. have a nice day.

Running head: Type equation here.

1

Acid and bases
Students name
Institutional Affiliation(s)

2

1) Calculate the pH of each solution below based on the given [H+] concentrations.
a. [H+] =3.45x10−2
pH= -log10 (3.45x10 − 2)
=1.46
b. [H+] =7.42x10−6
pH= -log10 (7.42x10 − 6)
=5.13
c. [H+] =3.95x 10−9
pH= -log10 (3.95x10 − 9)
=8.4
d. [H+] =5.48x 10−7
pH= -log10 (5.48x10 − 7)
=6.26
e. [H+] =1.62x 10−3
pH= -log10 (1.62x10 − 3)
=2.79

2) Calculate the pOH of each solution below based on the given [OH−] concentrations.
a. [OH−]=6.75 x10−4
pOH= -log10 (6.75x10 − 4)

3
=3.17
b. [OH−]=7.49x10−5
pOH= -log10 (7.49x10 − 5)
=4.13
c. [OH−]=5.92 x10−8
pOH= -log10 (5.92x10 − 8)
=7.23
d. [OH−]=6.43x10−2
pOH= -log10 (6.43x10 − 2)
=1.19
e. [OH−]=5.64 x10−9
pOH= -log10 (5.64x10 − 9)
=8.25

3) Calculate the pH of each solution below based on the given [OH−] concentrations.
a. [OH−] = 2.68 x10−8
pH= -log10 (2.68 x10 − 8)
=7.57
pH + pOH = 14
pH= 14 – pOH
=14-7.57
=6.43

4
b. [OH−]=5.64x10−3
pH= -log10 (5.64x10 − 3)
=2.25
pH + pOH = 14
pH= 14 – pOH
=14-2.25
=11.75
c. [OH−]=6.83 x10−7
pH= -log10 (6.83x10 − 7)
=6.17
pH + pOH = 14
pH= 14 – pOH
=14-6.17
=7.83
d. [OH−]=9.38x10−1
pH= -log10 (9.38x10 − 1)
=0.028
pH + pOH = 14
pH= 14 – pOH
=14-0.028
=13.972
e. [OH−]=1.44 x10−6
pH= -log10 (1.44x10 − 6)

5
=5.84
pH + pOH = 14
pH= 14 – pOH
=14-5.84
=8.16

4) Label the following solutions as either acidic or basic based on the information provided.
a. pH=4.6

acid

b. pOH =3.5 acid
c. pH =8.7 base
d. pOH =7.5 base
5) Identify the conjugate base for ...

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Anonymous
Top quality work from this guy! I'll be back!

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