HW09 - Chemistry 111 Homework #9 Due: November 09, 2005...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Chemistry 111 Homework #9 Due: November 09, 2005 (Wednesday) 1. The first law of thermodynamics states that… a) the energy of every pure substance is zero. b) the disorder is always increasing. c) enthalpy is always increasing. d) the total energy of the universe is increasing. e) the entropy of the surroundings is zero. f) the total energy of the universe is constant. 2. How many calories are equivalent to 364 J? a) 1523 cal b) 87.0 cal c) 14.6 cal d) 0.364 cal e) 1.33 cal f) None of these. 3. Specific heat is… a) the number of kelvins that 1.00 mol of a substance is raised by heating it for 1.00 minute. b) the amount of heat needed to change 1.00 mol of a substance’s temperature by 1.00 K. c) the amount of energy required to melt 1.00 g of a substance. d) the amount of substance that is heated by 1.00 K. e) the number of kelvins that 1.00 g of a substance is raised by heating it for 1.00 minute. f) the amount of heat needed to change 1.00 g of a substance’s temperature by 1.00 K. 4. A system consists of 650 g of water originally at 20.5°C. How much heat must the system absorb to raise its temperature to 65.5°C? a) 151 kJ b) 55.8 kJ c) 178 kJ d) 122 kJ e) 131 kJ f) None of these.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Chemistry 111 2 Homework #9 / Fall 2005 5. Equal masses of two substances, A and B, each absorb 25 J of energy. If the temperature of A increases by 4 degrees while the temperature of B increases by 8 degrees, one can safely say that… a) the specific heat of B is double that of A. b) the specific heat of A is double that of B. c) the specific heat of B is negative. d) the specific heat of A is negative. e) the specific heat of B is triple that of A. 6. Consider a dropping mass of 500 kg which turns a paddle as it falls. Calculate the height that the mass should drop in order to increase the temperature of 650 g of water, originally at 20.5°C, to 65.5°C. W
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 6

HW09 - Chemistry 111 Homework #9 Due: November 09, 2005...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online