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Exam 1: Introduction

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Question 41

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Classify the following as a mixture, a compound, or an element: Brewed coffee, ready to drink.

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Question 42

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What will be the cost of gasoline for a 3,700-mile trip in a car that gets 23 miles per gallon, if the average price of gas is $2.90 per gallon?

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Question 43

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How many significant figures does the number 0.00721 contain?

The density of lead is 11.4 g/cm³. Express this density in pounds per cubic foot.

A piece of metal with a mass of 611 g is placed into a graduated cylinder that contains 25.1 mL of water, raising the water level to 56.7 mL. What is the density of the metal?

Identify the following as a physical or chemical change: Formation of snowflakes.

Classify the following as a physical or chemical change: Food spoils.

An excavator is preparing to dig a basement for a new house. Part of his contract reads that he must dispose of all the dirt he removes while digging the basement in an EPA approved landfill. He will dig a hole that is 40 feet wide by 50 feet long and 7.5 feet deep. He first uses his shovel and scoops up 1.00 kg of dirt, and then determines that the dirt has a volume of 600 cm³. The excavator knows that his dump truck can only carry 8,000 kg of dirt. How many dump-truck loads will it take to haul the dirt away?

A special flask used in the determination of densities, called a pycnometer, has a mass of 16.3179 g when empty, and it has a mass of 48.0250 g when filled with water at 20.0 ^$\circ$ C. When this same pycnometer is filled with ethyl alcohol at 20.0 ^$\circ$ C, it is found to have a mass of 41.3934 g. Find the density of ethyl alcohol at 20.0 ^$\circ$ C. (Given: at 20.0 ^$\circ$ C, the density of water is 0.9982 g/mL)

The number 1.050 * 10⁹ has how many significant figures?

Identify the following as a physical or chemical change: Water is broken down into hydrogen and oxygen.

The city of Los Angeles is now approximately 2400 miles south of Alaska. It is moving slowly northward as the San Andreas fault slides along. If Los Angeles is to arrive near Anchorage, Alaska, in 76 million years, at what average rate will it have to move in mm per month?

Classify the following as a mixture, a compound, or an element: Orange juice.

Iron has a density of 7.87 g/cm³. What mass of iron would be required to cover a football playing surface of 120 yds *60 yds to a depth of 1.0 mm? (1 inch = 2.54 cm; 1 lb = 453.6 g)

After carrying out the following operations, how many significant figures are appropriate to show in the result? (13.7 + 0.027) / 8.221

What is the density of a salt solution if 50.0 mL of the solution has a mass of 57.0 g?

An object will float at the surface of a liquid if the mass of the object is less than the mass of the liquid that it displaces. A spherical vessel (diameter = 2.00 cm) when empty has a mass of 2.00 g. What is the greatest volume of water that can be placed in the vessel and still have the vessel float at the surface of water? (Given: density of water = 1.00 g/cm³)

An object sinks when placed in water if the mass of the object is greater than the mass of the water that the object displaces. Which of the following objects will sink when dropped into a bucket of water? (Given: density of water = 1.00 g/cm³)

A block of iron has a mass of 826 g. What is the mass of a block of magnesium that has the same volume as the block of iron? The following densities at 25 ^$\circ$ C are provided: magnesium, 1.7 g/cm³ ; graphite, 1.8 g/cm³ ; iron, 7.9 g/cm³.

Which of the following does not represent a chemical change?