Honors Chemistry Density Quiz

What is the mass of 200 cm³ of lead?

• 2268 g

• 1134 g

• 500 g

• 4000 g

What is the volume of a block of aluminum with mass 40.5 g if the density of Al is 2.70 g/mL?

• 15.0 mL

• 10.0 mL

• 20.0 mL

• 25.0 mL

Density is the ratio of the mass of a material to its volume. It is a measure of how “packed in” matter is. D = m/V D = density; measured in g/ml or g/cm³ m = mass; measured in grams V = volume; measured in ml or cm³ Mercury metal is poured into a graduated cylinder that holds exactly 22.5 mL. The mercury used to fill the cylinder weighs 306.0 g. From this information, calculate the density of mercury.

• 13.6 g/mL

• 0.0735 g/mL

• 7.35 g/mL

• 1.36 g/mL

What is the mass of ethyl alcohol that exactly fills a 200.0 mL container? The density of ethyl alcohol is 0.789 g/mL.

• 157.8 g

• 178.0 g

• 126.5 g

• 200.0 g

A golden-colored cube is handed to you. The person wants you to buy it for $100, saying that is a gold nugget. You pull out your old geology text and look up gold in the mineral table, and read that its density is 19.3 g/cm³. You measure the cube and find that it is 2 cm on each side, and weighs 40 g. What is its density? Is it gold? Should you buy it?

• Density = 5 g/cm³. It is not gold. You should not buy it.

• Density = 10 g/cm³. It is gold. You should buy it.

• Density = 19.3 g/cm³. It is gold. You should buy it.

• Density = 20 g/cm³. It is not gold. You should not buy it.

Ice floats in water but steel sinks because of differences in density. How does a ship like the Titanic float in the ocean?

• Because the ship's overall density is less than water due to the air inside it

• Because steel is lighter than water

• Because the ship is moving fast

• Because the ocean is saltier than freshwater

What is the correct way to graph the measured data for iron from Table 1, with volume on the x-axis and mass on the y-axis?

• Plot volume (cm³) on the x-axis and mass (g) on the y-axis for each trial's data point.

• Plot mass (g) on the x-axis and volume (cm³) on the y-axis for each trial's data point.

• Plot both mass and volume on the y-axis for each trial's data point.

• Plot both mass and volume on the x-axis for each trial's data point.

What is the slope (rise over run) of the graph? Show your work on the graph.

• The slope is approximately 7.6 g/cm³ (using two points: (5.0, 38.00) and (0, 0): (38.00-0)/(5.0-0) = 7.6).

• The slope is approximately 5.0 g/cm³ (using two points: (5.0, 38.00) and (0, 0): (5.0-0)/(38.00-0) = 0.13).

• The slope is approximately 38.0 g/cm³ (using two points: (5.0, 38.00) and (0, 0): (38.00-0)/(1.0-0) = 38.0).

• The slope is approximately 1.3 g/cm³ (using two points: (5.0, 38.00) and (0, 0): (38.00-0)/(30.0-0) = 1.3).

What is the experimentally determined density of iron? (from slope of graph)

• The experimentally determined density of iron is approximately 7.6 g/cm³.

• The experimentally determined density of iron is approximately 2.7 g/cm³.

• The experimentally determined density of iron is approximately 1.0 g/cm³.

• The experimentally determined density of iron is approximately 19.3 g/cm³.

The accepted density of iron is 7.87g/cm³. Use the experimentally determined density from your graph and the accepted density of iron to calculate the percent error of your result.

• Percent error = [(experimental density - 7.87) / 7.87] × 100

• Percent error = [(7.87 - experimental density) / experimental density] × 100

• Percent error = [(experimental density + 7.87) / 7.87] × 100

• Percent error = [(7.87 + experimental density) / experimental density] × 100