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Exam 1: Introduction

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Question 71

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

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Question 72

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Classify the following as a pure substance or a mixture: Ice cream.

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Question 73

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Which one of the following is an example of a physical property?

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

How many cubic centimeters of an ore containing only 0.22% gold (by mass) must be processed to obtain $100 worth of gold? The density of the ore is 8.0 g/cm³ and the price of gold is $818 per troy ounce. (14.6 troy oz = 1.0 ordinary pound, called an avoirdupois pound; 1 lb = 454 g)

The radius of the Earth is approximately 6370 km. If one could dig down straight towards the center of the Earth, one would find that the outermost 2890 km (the crust and the mantle) has an average density of about 4.5 g/cm³. Farther down is the core. If the average density of the Earth is 5.5 g/cm³, what is the average density of the Earth's core? (Recall that the volume of a sphere is given by V = (4/3) $\pi$ r³.)

The conversion of water into steam is an example of a chemical change.

How many cubic centimeters are there in exactly one cubic meter?

The volume of a sphere is given by V = (4/3) $\pi$ r³ where r is the radius. What is the mass of a magnesium sphere with a radius of 0.80 cm? (The density of magnesium is 1.74 g/cm³.)

What will be the cost of gasoline for a 4,700-mile automobile trip if the car gets 41 miles per gallon, and the average price of gas is $2.79 per gallon?

The recommended daily allowance (RDA) of calcium is 1.2 g. Calcium carbonate contains 12.0% calcium by mass. How many grams of calcium carbonate are needed to provide the RDA of calcium?

If the price of gasoline is $2.99 per U.S. gallon, what is the cost per liter? (1 L = 1.06 qt)

Classify the following as either a physical or a chemical property: Ice melts at 0^oC.

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.

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?

Classify the following as an element, a compound, or a mixture: Oxygen gas.

The SI prefixes milli and mega represent, respectively:

A unifying principle that explains a body of facts and relations is referred to as

The highest temperature ever recorded in Phoenix, Arizona, was 122 ^$\circ$ F. Express this temperature in ^$\circ$ C.

Complete the following sentence. A theory is