Chemistry Quiz

Classify each of the following as an element, a compound, or a mixture:

• iron

• oxygen

• mercury oxide

• pancake syrup

Classify each of the following as a physical change or a chemical change:

• Burning a piece of paper

• Melting an ice cube

• Rusting of iron

• Cutting a piece of wood

Identify whether each of the following is a physical property or a chemical property:

• The boiling point of water

• The flammability of gasoline

• The hardness of a diamond

• The reactivity of sodium with water

Classify each of the following as a physical change or a chemical change:

• Burning a piece of paper

• Melting an ice cube

• Rusting of iron

• Cutting a piece of wood

Express each of the following numbers in scientific notation with correct significant figures:

• 711.0

• 0.239

• 90743

• 134.2

How many significant figures are contained in each of the following measurements?

• 53 cm

• 2.05 × 10^8 m

• 86,002 J

• 9.740 × 10^4 m/s

Perform the following calculations and report each answer with the correct number of significant figures. (a) 62.8 × 34 (b) 0.147 + 0.0066 + 0.012 (c) 38 × 95 × 1.792 (d) 15 - 0.15 - 0.6155

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Complete the following conversions between SI units. Show your work to receive credit. (a) 612 g = ________ mg (b) 8.160 m = ________ cm (c) 3779 μg = ________ g (d) 781 mL = ________ L

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Osmium is one of the densest elements known. What is its density if 2.72 g has a volume of 0.121 cm³? Show your work to receive credit.

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Calculate these masses. Show your work to receive credit. (a) What is the mass of 6.00 cm³ of mercury, density = 13.5939 g/cm³? (b) What is the mass of 25.0 mL octane, density = 0.702 g/cm³?

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