Which of the following is not a result of cross-linking polymer chains?
(a) Increased hardness
(b) Increased melting temperature
(c) Decreased plastic deformation
(d) Increased brittleness
(b) Increased melting temperature
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Potential: How much work is needed to carry an electron from the positive terminal to the negative terminal of a 9.0-V battery. (e = 1.60 × 10-19 C , melectron = 9.11 × 10-31 kg)
A. 1.6 × 10-19 J B. 17 × 10-19 J C. 9.0 J D. 14.4 × 10-19 J E. 14.4 × 10-19 J/C
Which of the following type of electromagnetic radiation has the highest energy?
A) radio B) infrared C) visible D) ultraviolet E) X-ray
The main source of energy for a star as it grows in size to become a red giant is ________
A) hydrogen fusion in a shell surrounding the central core B) gravitational contraction C) helium fusion in the central core D) hydrogen fusion in the central core
If atomic hydrogen can destroy ozone, and most of the matter in the universe is hydrogen, why is hydrogen not a major cause of ozone depletion?
What will be an ideal response?