1. REFRESHER Flashcards
The following reactions is important in lake and river sediments that are devoid of oxygen
SO42- + H+ + CH2O → HS- + CO2 + H2O
Balance this equation.
1, 1, 2, 1, 2, 2
A voltaic cell is represented by the following equation:
Fe(s) + Zn2+(aq) 🡪 Fe2+(aq) + Zn(s)
Which electrode is the anode and which electrode is the cathode?
ANSWER: Anode = Fe and Cathode = Zn
Distance from the earth to the most remote known normal galaxies is calculated to be:
9x1025 m
Mean distance from the equator to the north pole is:
1x107 m
Determine the volume in mL of 1mol of pure
ethyl alcohol.
ANSWER: 58 mL
If high octane gasoline with density 0.71 is used by a BMW on NLEX to travel to Tarlac 125 mi away and a gas mileage of 19.75 mi/gal estimate the quantity in kg of carbon dioxide produced.
52 kg
Iodine vapor forms iodine crystals when it touches a cold surface. What is the reverse of the process being described?
sublimation
What is the chemical formula of aspirin?
A. C8H9O3 C. C8H13O5
B. C9H8O4 D. C10H34O
ANSWER: B. C9H8O4
Which of the following formula is red lead?
A. PbO C. Pb2O4
B. Pb4O6 D. Pb3O4
ANSWER: D. Pb3O4
What is the common name of this compound C6H5OCH3?
A. Aniline C. Cumene
B. Styrene D. Anisole
ANSWER: D. Anisole
What is the formula of melamine?
A. C3H6N6 C. C4H7N8
B. C3H8N6 D. C4H8N6
ANSWER: A. C3H6N6
Calculate the mass of titanium in kilograms in 0.4011 million grams of TiCl4.
ANSWER: 101
Author of Octet Rule
ANSWER: Gilbert Lewis
Who discovered EDTA?
ANSWER: Ferdinand Munz
The Nobel Prize for radioactivity discovery was shared between Curie and Roentgen. Who coined the word “Serendipity” in 1754?
ANSWER: Horace Walpole
Who invented vulcanized rubber?
ANSWER: Charles Goodyear
Who discovered the structure of benzene?
ANSWER: Friedrich August Kekule
Who is the father of Quantum Theory?
ANSWER: Max Planck
Who discovered x-ray?
ANSWER: Wilhelm Conrad Roentgen
What was Melvin Calvin was known for his study of?
ANSWER: photosynthesis
What discovered Deuterium?
ANSWER: Harold C. Urey
Father of nuclear chemistry and discovered proof of nuclear fission.
ANSWER: Otto Hann
Who discovered carbon dating?
ANSWER: Willard Libby
In an experiment it was found that the total charge on an oil drop was 5.93x10-18 C. How many negative charges does the drop contain?
ANSWER: D. 37