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18. The statement "matter can be neither created nor destroyed by chemical means, but it can be changed from one form to another" is the chemical law of A. conservation of energy. B. conservation of matter. C. atomic disintegration. D. definite proportions.
Weegy: The answer is B. conservation of matter. :) User: 19. Organic chemistry is the study of compounds containing A. oxygen. B. carbon. C. nitrogen. D. hydrogen. Weegy: C. carbon. (More)
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Updated 12/4/2012 2:45:18 PM
1 Answer/Comment
B. conservation of matter. Is the obvious choice.
Added 12/4/2012 2:45:18 PM
9. If the distance from a converging lens to the object is less than the focal length of the lens, the image will be A. real, inverted, and larger than the object. B. virtual, upright, and larger than the object. C. virtual, upright, and smaller than the object. D. real, inverted, and smaller than the object.
Weegy: If the distance from a converging lens to the object is less than the focal length of the lens, the image will be virtual, upright, and larger than the object. (More)
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Updated 157 days ago|2/21/2015 11:05:26 AM
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18. A failure of the red-sensitive nerves in the eye to respond to light properly causes A. color blindness. B. chromatic aberration. C. farsightedness. D. astigmatism.
Weegy: The answer is: B. color blindness. User: 19. When an object is placed 8 millimeters from a concave spherical mirror, a clear image can be projected on a screen 16 millimeters in front of the mirror. If the object has a height of 4 millimeters, the height of the image is A. 8 millimeters. B. 2 millimeters. C. 4 millimeters. Weegy: If the object has a height of 4 millimeters, the height of the image is 2 millimeters. (More)
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Expert Answered
Asked 12/5/2012 11:01:05 AM
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7. The grid in a high-vacuum triode is usually kept negatively charged with respect to the cathode so that the electrons may be A. accelerated toward the anode. B. attracted to the cathode instead of the grid. C. attracted to the anode instead of the grid. D. accelerated toward the cathode.
Weegy: D. accelerated toward the anode. The anode is positively charged to attract the electrons coming from the cathode. The electrons, being negatively charged, will not be attracted to the grid. User: 8. To use your left hand to determine the direction of the voltage developed in a moving conductor in a stationary magnetic field, you must point your A. forefinger in the direction of the lines of force. B. forefinger in the direction of the motion. C. thumb in the direction of the electromagnetic force. D. thumb in the direction of the magnetic flux. Weegy: To use your left hand to determine the direction of the voltage developed in a moving conductor in a stationary magnetic field, you must point your D. forefinger in the direction of the lines of force. [ ] User: 9. A PNP transistor is connected in a circuit so that the collector-base junction remains reverse biased and the emitter-base junction is forward biased. This transistor can be used as a power amplifier because A. the output current will be much larger than the input current. B. the output voltage will be much smaller than the input voltage. C. the output current will be much smaller than the input current. D. the output voltage will be much larger than the input voltage. Weegy: C. the output voltage will be much larger than the input voltage. User: 10. If a bar of copper is brought near a magnet, the copper bar will be A. repelled by the magnet. B. made into an induced magnet. C. unaffected by the magnet. D. attracted by the magnet. Weegy: The answer is A. repelled by the magnet. User: 11. A transformer has a primary voltage of 115 V and a secondary voltage of 24 V. If the number of turns in the primary is 345, how many turns are in the secondary? A. 690 B. 8 C. 72 D. 1,653 Weegy: The answer is C. 72 User: When all parts of a circuit are composed of conducting materials, the circuit is said to be A. open. B. shorted. C. parallel. D. closed. Weegy: The answer is D. closed. ... (More)
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Expert Answered
Asked 12/5/2012 11:35:00 AM
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