3. 175oK - 273 = -98 oC x 1.8 + 32 = -144.4 oF oK → oC → oF
Question 4
Be sure to show the correct number of significant figures in each calculation.
1. Show the calculation of the mass of a 17.9 ml sample of chloroform with density
of 1.49 g/ml
2. Show the calculation of the volume of 19.4 grams of cresol with density of 1.02
g/ml
Answer:
1. M = D x V = 1.49 x 17.9 = 26.7 g
2. V = M / D = 19..02 = 19.0 ml
Question 5
1. 1.35601 contains ? significant figures.
2. 0.151 contains ? significant figures.
3. 1.35601 + 0.151 = ? (give answer to correct number of significant figures)
Answer:
, 1. 1.35601 contains 6 significant figures.
2. 0.151 contains 3 significant figures.
3. 1.35601 + 0.151 = 1.50701 = 1.507 (to the thousands place for 0.151)
Question 6
Classify each of the following as an element, compound, solution or heterogeneous
mixture and explain your answer.
1. Honey
2. Hydrogen iodide
3. Tea
Answer:
1. Honey - is not on periodic table (not element) - no element names (not
compound) appears to be one substance = Solution
2. Hydrogen iodide - is not on periodic table (not element) - has two element names
= Compound
3. Tea - is not on periodic table (not element) - no element names (not compound)
appears to be one substance = Solution
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