1. 328 K - 273 55 C

CHEM103 / CHEM 103 Module 1:

(Latest Update 2025 / 2026) General Chemistry I with Lab | Questions & Answers | Grade A | 100% Correct - Portage Learning

Question:

Do the conversions shown below, showing all work:

1. 328 K = ? C

2. 76 C = ? F

3. 135 F = ? K

Answer:

1. 328 K - 273 = 55 C

K → C (make smaller) -273

• 76 C x 1.8 + 32 = 168.8 F

C → F (make larger) x 1.8 + 32

3. 135 F - 32 ÷ 1.8 = 57.2 + 273 = 330.2 K

F → C → K

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Question:

Be sure to show the correct number of significant figures in each calculation.

• Show the calculation of the mass of a 10.5 ml sample of mercury with

density of 13.5 g/ml

• Show the calculation of the volume of 21.3 grams of dioxane with density of

1.03 g/ml

Answer:

• M = D x V = 13.5 x 10.5 = 142 g

• V = M / D = 21.3 / 1.03 = 20.7 ml

Question:

• 3.0600 contains ? significant figures.
• 0.0151 contains ? significant figures.
• 3.0600 ÷ 0.0151 = ? (give answer to correct number of significant figures)

Answer:

• 3.0600 contains 5 significant figures.
• 0.0151 contains 3 significant figures.
• 3.0600 ÷ 0.0151 = 202.649 = 203 (to 3 significant figures for 0.0151)

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Question:

Classify each of the following as an element, compound, solution or heterogeneous mixture and explain your answer.

• Oreo cookie
• Sulfur dioxide
• Grape juice

Answer:

• Oreo cookie - is not on periodic table (not element) - no element names

(not compound), appears as more than one substance (cookie, cream) = Hetero Mix

• Sulfur dioxide - is not on periodic table (not element) - has two element

names = Compound

• Grape juice - is not on periodic table (not element) - no element names

(not compound), appears to be one substance = Solution

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