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Exam 1: Chemistry: The Study of Change

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Question 51

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Choose the response that includes all the items listed below that are pure substances. i.orange juice ii.steam iii.ocean water iv.oxygen v.vegetable soup

A) i, iii, v
B) ii, iv
C) i, iii, iv
D) iv only
E) all of them are pure

F) A) and B)
G) B) and D)

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Question 52

Multiple Choice

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If a car has an EPA mileage rating of 30 miles per gallon, what is this rating in kilometers per liter? (1 L = 1.06 qt)

A) 200 km/L
B) 180 km/L
C) 70 km/L
D) 13 km/L
E) 11 km/L

F) B) and D)
G) None of the above

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Question 53

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Classify the following as an element, a compound, or a mixture: Table salt (non-iodized).

What is the density of copper if 11.8 cm³ of copper has a mass of 105.2 g?

A soft drink costs 75 cents for a 12-oz can.A two-liter bottle costs $1.25.In which form is the soft drink more expensive? How much more expensive? (1.0 L = 1.057 qt, 1 qt = 32 oz)

Complete the following sentence. A hypothesis is

Give three examples of pure substances.

Classify the following as a physical or chemical change: Antifreeze boils out of a radiator.

What is the volume, in cubic inches, of a brick that is 4.0 in * 2.7 in * 8.0 in?

Convert 500.milliliters to quarts. (1L = 1.06 qt)

Classify the following as a mixture, a compound, or an element: Sugar to put in a cup of coffee.

A particular flask has a mass of 17.4916 g when empty. When filled with ordinary water at 20.0°C (density = 0.9982 g/mL) , the mass of the flask is now 43.9616 g. The density of so-called "heavy water" at 20.0°C is 1.1053 g/mL. What will the mass of the flask be when filled with heavy water at 20.0°C?

A microliter corresponds to:

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)

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?

Identify the following as a physical or chemical change: Fermenting grapes.

What are the three states of matter?

The diameter of Earth is 12.7 Mm. Express this diameter in centimeters.

Which of the following represents the largest mass?

Americans combined drive about 4.0 *10⁹ miles per day and their vehicles get an average of 20 miles per gallon of fuel used. For each 1 kg of gasoline that is burned, about 3.0 kg of carbon dioxide are produced. How many kilograms of CO₂ are emitted into the atmosphere each day by cars in the U.S.? One gallon of gas weighs about 3.5 kg.