If water had a lower specific heat capacity, would ponds and lakes be more or less likely to freeze in winter?
What will be an ideal response?
Answer: Bodies of water would more likely freeze because a lower specific heat capacity means more decrease in temperature as water loses energy, and the water would be more readily cooled to the freezing point.
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A major source of chlorine gas, Cl2, is from the electrolysis of brine, which is concentrated salt water, Which of the following is the balanced chemical reaction for this electrolysis reaction?
A. 2 NaCl (aq) + H2O ? 2 NaH (aq) + Cl2O (aq) B. 2 NaCl (aq) + 2 H2O ? 2 Na (s) + O2 (g) + 2 H2 (g) + Cl2 (g) C. 2 NaCl (aq) + H2O ? Na2O (aq) + 2 HCl (aq) D. 2 NaCl (aq) + 2 H2O ? 2 NaOH (aq) + Cl2 (g) + 2 H2 (g)
What is the speed of a proton that has been accelerated from rest through a potential difference of 4.0 kV?
A. 1.1 × 106 m/s B. 9.8 × 105 m/s C. 8.8 × 105 m/s D. 1.2 × 106 m/s E. 6.2 × 105 m/s
When a battery does 24 J of work on 10 C of charge, the voltage it supplies is
A) 2.4 V. B) 4.2 V. C) 24 V. D) 240 V. E) none of the above
Generators that were used in the past to supply electricity in automobiles have been replaced by
A) batteries. B) armatures. C) dynamos. D) alternators. E) commutators.