Chem 120 Lab Final Review Latest Update Questions and 100% Verified Correct Answers with Rationale Guaranteed A+

Chem 120 Lab Final Review Latest Update 2025-
2026 Questions and 100% Verified Correct
Answers with Rationale Guaranteed A+

5 signs that indicate a chemical reaction has occurred - CORRECT ANSWER: color
change

light
gas formed

heat

turns cloudy



A 25 mL graduated cylinder in our lab is read to the nearest _____ mL. - CORRECT
ANSWER: 0.1



Actual yield=32g

% yield= 80%

What is theoretical yield? - CORRECT ANSWER: 40g


Blue litmus paper turns______ in HCl - CORRECT ANSWER: red



Chemical or physical change...

a) ice melting

b) tearing paper

c) moth ball disappearing
d) burning candle

e) iodine evaporation - CORRECT ANSWER: a) physical
b) physical

, c) physical

d) chemical

e) physical


Color of Br2 - CORRECT ANSWER: brown



Color of Cl-

Color of Br- - CORRECT ANSWER: colorless

colorless



Color of Cl2 - CORRECT ANSWER: yellow


Describe a "cool" flame. - CORRECT ANSWER: blue color, not very hot.



Dilute sodium hydroxide is found in a ____ bottle - CORRECT ANSWER: plastic



Draw the Lewis structure of 1-propanol and tell if H-bonding is possible. - CORRECT
ANSWER: Yes, h-bonding is possible.



CH3-CH2-CH2-OH


Mouth suction is never used. Use ________. - CORRECT ANSWER: pipet pump



Name 3 chemicals that need to be handled in fume hood - CORRECT ANSWER:
cyclohexane

acetone

methanol