Which of the following molecules contains an ionic bond?
A) MgCl2
B) Cl2
C) SF3
D) PO4-3
E) none of the above
Answer: A
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Which of the following best describes a filtergram?
A) It is a region inside a star where energy is carried outward as rising hot gas. B) It is composed of ionized gas trapped in a magnetic arch rising up through the photosphere. C) It is an atom in which an electron has moved from a lower to a higher energy level. D) It is a photograph taken in the light of a specific region of the spectrum of the Sun.
A(n) _______________ is an object that orbits the Sun and is spherical, but not large enough to have the gravitational influence to clear away remaining objects orbiting nearby
Fill in the blank(s) with correct word
In a contest, two tractors pull two identical blocks of stone the same distance over identical surfaces. However, block A is moving twice as fast as block B when it crosses the finish line. Which statement is correct?
A. Block A has twice as much kinetic energy as block B. B. Block B has lost twice as much kinetic energy to friction as block A. C. Block B has lost twice as much kinetic energy as block A. D. Both blocks have had equal losses of energy to friction. E. No energy is lost to friction because the ground has no displacement.
How much heat would be required to melt 1.0 kg of LEAD, initially at room temperature? Assume room temperature to be 20°C
(c = 920 J/kg-C° Lf = 0.25 × 105 J/kg LV = 8.67 × 105 J/kg melts at 328.°C boils at 1744.°C)