The reaction rate of a chemical reaction doubles when the temperature increases from 10
to 50
What is the activation energy?
a. 
b. 
c. 
d. 
e. 
d.
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Titan is the only moon with a thick atmosphere, and its surface ________ .
a. has never been seen. b. has been seen by infrared light and spacecraft. c. is warmed by a greenhouse effect. d. has oceans of liquid methane and ethane. e. all except a.
A habitable zone
A) exists around all stars B) only exists around stars which are identical to the Sun C) only exists around stars which are similar to our Sun D) only exists around one star, the Sun
The length of a certain wire is kept same while its radius is doubled. What is the new resistance of this wire?
A) It is increased by a factor of 2. B) It is increased by a factor of 4. C) It is reduced by a factor of 2. D) It is reduced by a factor of 4. E) It is reduced by a factor of 8.
Four different uses of lasers are __________, __________, __________, and __________,
Fill in the blank(s) with correct word