Which of the following statements about electrochemistry is not true?
A) It is the study of how electrical energy and chemical reactions are related.
B) It involves the use of a set of oxidation-reduction reactions to produce electrical current.
C) It involves the use of electrical current to produce an oxidation-reduction reaction.
D) It is the study of how electrons are transferred from one chemical compound to another.
E) All of the above are true.
Answer: E
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Rosalind Franklin's research contribution was essential in
a. discovering the existence of DNA. b. establishing the principles of heredity. c. establishing the structural features of DNA. d. determining the nucleotide sequence of genes. e. determining the tertiary structure of proteins.
Uniform Electric Fields: Two very large parallel metal plates, separated by 0.20 m, are connected across a 12-V source of potential. An electron is released from rest at a location 0.10 m from the negative plate. When the electron arrives at a distance 0.050 m from the positive plate, how much kinetic energy has the electron gained? (e = 1.60 × 10-19 C)
A. 2.4 × 10-19 J B. 4.8 × 10-19 J C. 7.2 × 10-19 J D. 9.6 × 10-19 J
A 6-kg bowling ball moving at 3 m/s collides with a 1.4-kg bowling pin at rest. How do the magnitudes of the forces exerted by the collision on each object compare?
A. The force on the pin is larger than the force on the ball. B. The force on the ball is larger than the force on the pin. C. Both objects experience the same magnitude of force. D. The collision exerts no force on the ball. E. There is no way to tell.
A vertical wire carries a current straight up in a region where the magnetic field vector points due north. What is the direction of the resulting force on this current?
A) down B) north C) south D) east E) west