Microfossils found in northwestern Australia in 2011 appear to have been
A) photoheterotrophs
B) chemoheterotrophs
C) photoautotrophs
D) chemoautotrophs
C
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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)
A 100. gram steel bullet moves at 250. m/s just before imbedding itself into a thick anchored wood post. If 40.% of the initial kinetic energy goes into heating the bullet (steel c = 460.J/kg-C):
(a) how hot does the bullet become if it initially is at 25.°C? (b) what would be the bullet's temperature if it had been twice as massive ( 2 times 100. grams)?
Name four ways that the interstellar medium reveals its presence
What will be an ideal response?
You hold a 5-newton rock motionless in your hand. Regarding the forces on this rock,
A) the net force on the rock is zero. B) the downward force of gravity is balanced by the upward force of air resistance. C) there are no forces of any kind acting on the rock, because it is not moving. D) the net force on the rock is 5 newtons, directed downward. E) the net force on the rock is 5 newtons, directed upward.