Section Review
Section 2-1
7) What happens in terms of heat transfer when you hold a snowball in your hand?
The system (your hands) creates heat into the surroundings (which is the snowball).  

8) Use table 2-2 to determine the following. 
a) Which of the metals listed requires the most energy to raise its temperature by 1`C?
The element Neon requires the most energy to raise its temperature by 1`C. 

b) If energy is added at the same rate to contains all of the same mass made of copper, chromium, and lead, which container will show the greatest rise in temperature after 10 minutes?
Lead will show the greatest rise in temperature. It only takes 0.129 joules to raise it 1 K, compared to copper which takes 0.385 and chromium which takes 0.449. 

9) Convert the following Celsius temperatures to Kelvin temperatures.
a. 100`C = 373 K			c. 0`C = 273 K
b. 765`C = 1038 K			d. -37`C = 236 K

10) Convert the following Kelvin Temperatures to Celcius temperatures.
a. 273 K = 0 `C				c. 0 K = -273 `C
b. 1200 K = 927 `C			d. 100 K = -173 `C

11) The formula for calculating kinetic energy is KE=mv2/2. KE is the kinetic energy of an object, m is its mass, and v is its velocity. Recall that the explosion of the Grandcamp hurled the ship's anchor through the air. How much kinetic energy did the 1300 kg anchor have if it was traveling at a velocity of 50 m/s?






Section Review
8) How many significant figures are there in these expressions?
a. 470. km			3 significant Figures (470)
b. 0.0980 m			2 significant figures (98)
c. 30.8900 g			6 significant figures (30.8900)
d. 0.09709 kg			4 significant figures (9709)
e. 1000 g/1 kg			1 significant figure (1)

9) Perform the following calculations, and express the answers in significant figures.
a. 32.89 g + 14.21 g  = 47.10
b. 34.09 L - 1.230 L = 32.86
c. 3.45 * 10`5 g - 2.6 * 10`3 g  = 342.4 * 10`3 g
d. 1.8940 cm * 0.0561 cm = 0.1062 cm
e. 24.897 mi/0.8700 h = 28.617 mi/h

10) Express the following calculations in the proper number of significant figures. Use the scientific notation where appropriate. 
a. 129g/29.2 mL= 4.41 g/ml
b. (1.551 mm) (3.260 mm) (4.9001 mm) = 24.776 mm
c. 35 000 kJ/ 0.250 s = 87 kj/s
d. 0.367 L + 2.51 L + 1.6004 L = 4.47 L

11) A chemical process produces 653 550 kJ of heatin 142.3 minutes. What is the rate of heat production in kJ/minute?
4592 kJ a minute       (4592.7617709065)

12) Express the following quantities in scientific notation. 
a. 277 088 000 000 000 atoms  = 2.77088 *       (10 by the power of 14)
b. 0.000 000 000 000 839 602 g = 8.39602 *       (10 by the power of negative 13)
c. 700 004 mm = 7.00004 *      (10 by the power of 5)