Chem final study guide.

Question 1
1. Convert 0.00346 to exponential form and explain your answer.

2. Convert 2.76 x 104 to ordinary form and explain your answer.
Your Answer:
1. 0.00346 = smaller than 1 = negative exponent, move decimal 3
places = 3.46 x 10-3


2. 2.76 x 104 = positive exponent = larger than 1, move decimal 4
places = 27600

Question 2
Do the conversions shown below, showing all work:
1. 28oC = ? oK
2. 158oF = ? oC
3. 343oK = ? oF
1. 28oC + 273 = 301 oK o
C → oK (make
larger) +273
2. 158oF - 32 ÷ 1.8 = 70 oC o
F → oC (make
smaller) -32 ÷1.8
3. 343oK - 273 = 70 oC x 1.8 + 32 = 158 oF o
K → oC → oF

Question 3
Show the calculation of the number of moles in the given amount of the
following substances. Report your answerto 3 significant figures.


1. 12.0 grams of Ca3(PO4)2


2. 15.0 grams of C9H8NO4Cl
1. Moles = grams / molecular weight = 12..18 = 0.0387
mole


2. Moles = grams / molecular weight = 15..61 = 0.0653
mole

Question 4


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