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CHEM 210 EXAM 1 REVIEW questions and answers rated A+ 2024/2025
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CHEM 210 EXAM 1 REVIEW questions and answers rated A+ 2024/2025
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CHEM 210 EXAM 1 REVIEWWhat phase alternate is taking region if DHsub = 26.1 kJ/mol is being used to calculate the
heat involved in the procedure)
1)Liquid to solid
2) Gas to strong
3) Solid to liquid
four) Liquid to gasoline
five) Solid to gas - ANS3
Diethyl ether, (CH3CH2)2O , used as a solvent for extraction of natural compounds from
aqueous solutions, has a excessive vapor strain which makes it a capability hearth chance in
laboratories in which it's miles used. How a great deal electricity is launched while 10 g is
cooled from 50.Zero°C to ten.0°C?
Boiling factor 34.Five°C
warmness of vaporization 351 J/g
specific warmness capability, (CH3 CH2)2O(l) three.Seventy four J/(g·K)
particular warmth capacity, (CH3CH2)2O(g) 2.35 J/(g·K)1)
1)6.55 kJ
2) 4.79 kJ
three) 14.0 kJ
four) 1.3 kJ
five) 4.Sixty seven kJ - ANS5
Which molecules or compounds within the following pair have the best boiling factor?
NH3 or PH3
Ar or Kr
1) NH3 and Ar
2) NH3 and Kr
3) PH3 and Ar
four) PH3 and Kr
five) One of the pairs has the same boiling factor - ANS1
Which of the subsequent has a boiling factor which does not match the general trend?
1) HF
2) HCl
three) HBr
four) HI - ANS
Which of the subsequent atoms should have the best polarizability?
1) F
2) Br
three) Po
, four) Pb
5) He - ANS
Which of the following substances can have hydrogen bonds between molecules?
1) (CH3)3N
2) CH3-O-CH3
three) CH3CH2-OH
4) CH3CH2-F
5) HI - ANS
Neon condenses because of
1) dipole-dipole forces.
2) covalent bonding.
Three) London dispersion forces.
Four) intramolecular forces.
5) hydrogen bonding. - ANS
Which member of the subsequent pair has the better vapor strain: Xe or Ar
1) Xe
2) Ar
3) the pair has identical vapor pressures - ANS
A liquid has a DHvap of 35.5 kJ/mol and a boiling point of 122oC at 1.00 atm. What is its
vapor strain at 113oC?
1) 0.997 atm
2) zero.615 atm
three) zero.777 atm
four) zero.478 atm
five) None are correct. - ANS
Potassium hydrogen phosphate is used inside the guidance of non-dairy powdered
creamers. Calculate the molarity of a solution organized with the aid of dissolving a hundred
twenty five g of K2HPO4 ( = 174.2 g/mol) in sufficient water to provide 250 mL of solution.
1) 0.732 M
2) 0.865 M
3) four.Ninety seven M
four) 2.87 M
five) None of these alternatives is accurate. - ANS
What extent of focused sulfuric acid (18.4M) desires to be diluted to put together 5L of two.5
M H2SO4?
1) zero.29 L
2) zero.59 L
3) 0.Sixty eight L
four) 1.7 L
five) 3.4 L - ANS
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