A pure chemical substance made up of atoms of two or more types of elements in a fixed proportion is specifically called __________.
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Calorimetry: A lab assistant pours 330 g of water at 45°C into an 855-g aluminum container that is at an initial temperature of 10°C. The specific heat of aluminum is 900 J/kg ? K, and that of water is 4186 J/kg ? K. What is the final temperature of the system, assuming no heat is exchanged with the surroundings?
A. 28°C B. 32°C C. 31°C D. 33°C E. 35°C
A 2.5-kg object falls vertically downward in a viscous medium at a constant speed of 2.5 m/s. How much work is done by the force the viscous medium exerts on the object as it falls 80 cm?
a. +2.0 J b. +20 J c. ?2.0 J d. ?20 J e. +40 J
A radioactive substance with a half-life of 3.0 days has an initial activity of 2400 Bq. What is its activity after 6.0 days?
A) 1200 Bq B) 1800 Bq C) 600 Bq D) 300 Bq E) 150 Bq
Does the success of the Montreal Protocol mean that Hardin's Tragedy of the Commons fears are groundless?
What will be an ideal response?