An ideal gas has a pressure of 2.5 atm, a volume of 1.0 L at a temperature of 30 
How many molecules are there in the gas?
A. 
B. 
C. 
D. 
B.
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Two blocks of masses m1 and m2 are released from the top of two frictionless inclined planes of the same height making 30° and 60° angles with the horizontal direction, respectively
Which of the blocks is going faster when it reaches the bottom of its respective incline? A) We must know the actual masses of the blocks to answer. B) Both blocks have the same speed at the bottom. C) Block 1 is faster. D) Block 2 is faster. E) There is not enough information to answer the question.
An iron nail is brought near a magnet. Which of these is not true?
a. The nail has a north pole and a south pole. b. The nail becomes a north pole or a south pole. c. The magnet exerts an attractive force on the nail. d. The nail exerts an attractive force on the magnet. e. The nail is ferromagnetic.
Which of the following molecules contains an ionic bond?
A) MgCl2 B) Cl2 C) SF3 D) PO4-3 E) none of the above
Red light of the visible light spectrum has longer wavelengths than blue
a. True b. False Indicate whether the statement is true or false