How many water molecules are there in 36. g of water? Express your answer as a multiple of Avogadro's number NA. (The molecular structure of a water molecule is H2O.)
A) 18. NA
B) 2.0 NA
C) 36. NA
D) 3.0 NA
E) 0.020 NA
B
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Occam's Razor
A) divides the inner planets from the outer planets. B) tells scientists to use the simplest model, all other things being equal. C) is the term that describes how thin the rings of the Jovian planets are. D) describes how a planet's orbital period and distance from the Sun are related. E) is the tool that Copernicus used to shave.
A steel bar with a cross-sectional area of 1.00 × 10-4 m2 is heated to 100°C and then it is clamped at both ends with clamps that are 2.0 m apart
When the bar cools to 20°C what is the force exerted by the bar on the clamps? The coefficient of thermal expansion of steel is 12 × 10-6 K-1 and Young's modulus for steel is 20 × 1010 N/m2. A) 1.9 × 104 N B) 3.8 × 104 N C) 1.9 × 103 N D) 3.8 × 103 N E) 1.9 × 105 N
A very dense 1500-kg point mass (
A) and a dense 1200-kg point mass (B) are held in place 1.00 m apart on a frictionless table. A third point mass is placed between the other two at a point that is 20.0 cm from B along the line connecting A and B. When the third mass is suddenly released, find the magnitude and direction (toward A or toward B) of its initial acceleration. (G = 6.67 × 10-11 N ? m2/kg2 )
Why does ice float on water?
a. Ice is hydrophobic and repels water. b. Water molecules have less mass the colder they get. c. Water molecules are spaced farther apart in ice than in liquid water. d. Vibrating electrons in liquid water push ice to the surface. e. Hydrogen bonds are weaker in ice.