Compounds containing only carbon and hydrogen are known as ______________
Fill in the blank(s) with correct word
hydrocarbons
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Calorimetry: Two experimental runs are performed to determine the calorimetric properties of an alcohol which has a melting point of -10°C. In the first run, a 200-g cube of frozen alcohol, at the melting point, is added to 300 g of water at 20°C in a styrofoam container. When thermal equilibrium is reached, the alcohol-water solution is at a temperature of 5°C. In the second run, an identical cube of alcohol is added to 500 g of water at 20°C and the temperature at thermal equilibrium is 10°C. The specific heat capacity of water is 4190 J/kg ? K. Assume no heat is exchanged with the styrofoam container and the surroundings. What is the specific heat capacity of the alcohol?
A. 1700 J/kg ? K B. 1900 J/kg ? K C. 2100 J/kg ? K D. 2300 J/kg ? K E. 2500 J/kg ? K
Some alpha particles pass through gold foil with very little deflection mainly because the
A) electric field is zero inside the foil. B) atoms of gold are mostly empty space. C) net charge of the gold atoms is zero. D) all of the above E) none of the above
A 2.0-kg block slides down a frictionless incline from point A to point B. A force (magnitude P = 3.0 N) acts on the block between A and B, as shown. Points A and B are 2.0 m apart. If the kinetic energy of the block at A is 10 J, what is the kinetic energy of the block at B?
a.
27 J
b.
20 J
c.
24 J
d.
17 J
e.
37 J
Which of the following has the longest wavelength?
What will be an ideal response?