DOMBI CHEM 103 EXAM 1 2025/2026
QUESTIONS AND ANSWERS 100% PASS
A piece of shiny metal was found pm the edge of the road. The metal was put on a balance and
had a mass of 1.325g. The volume was determined by difference when the metal was placed
into a 20.00 ml column of oil, which was displaced to 34.97ml. - ANS a) volume=14.97ml
b) 0.08851
possible metal density: aluminum, zinc, lead, uranium - ANS unknown
light chocolate melts at 88.2 degrees f. What would this temperature be if reported on both the
Celsius scale and the Kelvin scale? - ANS 31.2c
304.4 k
Cysteine, C3H7NO2S is a sulfur containing amino acid often found in the active site of protein
enzymes. Given a 45.0g sample of cysteine, how many atoms of o can be isolated?
a) write avocadros statement
b) number of moles of cysteine in 45 grams of cysteine
c) number of o atoms in 45 g cysteine - ANS a) 1 mole cysteine=6.022x10^23
molecules=121.156g
b) 0.371
c) 4.47x10^23
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
QUESTIONS AND ANSWERS 100% PASS
A piece of shiny metal was found pm the edge of the road. The metal was put on a balance and
had a mass of 1.325g. The volume was determined by difference when the metal was placed
into a 20.00 ml column of oil, which was displaced to 34.97ml. - ANS a) volume=14.97ml
b) 0.08851
possible metal density: aluminum, zinc, lead, uranium - ANS unknown
light chocolate melts at 88.2 degrees f. What would this temperature be if reported on both the
Celsius scale and the Kelvin scale? - ANS 31.2c
304.4 k
Cysteine, C3H7NO2S is a sulfur containing amino acid often found in the active site of protein
enzymes. Given a 45.0g sample of cysteine, how many atoms of o can be isolated?
a) write avocadros statement
b) number of moles of cysteine in 45 grams of cysteine
c) number of o atoms in 45 g cysteine - ANS a) 1 mole cysteine=6.022x10^23
molecules=121.156g
b) 0.371
c) 4.47x10^23
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
