Which type of reaction is AlCl3 + 3KOH ? Al(OH)3 + 3KCl?
a. Single-replacement
b. Double-replacement
c. Decomposition
d. Combination
b
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The visible surface of the Sun is called the
a)chromosphere. b)photosphere. c)corona. d)celestial sphere. ?
Imagine that the sun ceased emitting light at wavelengths from about 600 to 700 nm. How would this look to us, and why?
What will be an ideal response?
The small circles in the diagram below represent the positions along the x axis of a body at equal time intervals. Assume the body moves in a straight line
This diagram is most likely to describe
a.
a swimmer swimming laps.
b.
an exercise on a rowing machine.
c.
a person on a treadmill.
d.
a tennis ball during a volley.
e.
a runner who tripped, fell, rose, and continued racing.
A sample of helium has a volume of 2.00 liters, a temperature of 20.0
and a pressure of 2.50 atmospheres. What is the energy needed to heat the sample of helium gas from 20.0
to 95.0 
at constant volume?
A. 88.0 J B. 137 J C. 175 J D. 207 J E. 476 J