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Chapter 1: Problem 11

Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (a) rice pudding, (b) seawater, (c) magnesium, (d) gasoline.

Short Answer

Expert verified
(a) Rice pudding is a heterogeneous mixture, (b) seawater is a homogeneous mixture, (c) magnesium is a pure substance, and (d) gasoline is a homogeneous mixture.

Step by step solution

01

(a) Rice Pudding Classification

Rice pudding is a mixture because it is made up of different components like rice, milk, and sugar. It is a heterogeneous mixture because the composition is not uniform, and the different ingredients can be visibly distinguished.
02

(b) Seawater Classification

Seawater is a mixture because it contains multiple components, such as water, salt, and other dissolved substances. It is a homogeneous mixture because its composition is uniform throughout, and the different components are not visibly distinguishable.
03

(c) Magnesium Classification

Magnesium is a pure substance because it is an element made up of only one type of particle.
04

(d) Gasoline Classification

Gasoline is a mixture because it consists of different hydrocarbon compounds. It is a homogeneous mixture because its composition is uniform, and the different components cannot be distinguished visually.

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Most popular questions from this chapter

In 1807 the English chemist Humphry Davy passed an electric current through molten potassium hydroxide and isolated a bright, shiny reactive substance. He claimed the discovery of a new element, which he named potassium. In those days, before the advent of modern instruments, what was the basis on which one could claim that a substance was an element?

Round each of the following numbers to four significant figures, and express the result in standard exponential notation: (a) \(102.53070\), (b) 656,980 , (c) \(0.008543210\), (d) \(0.000257870,(\mathrm{e})-0.0357202 .\)

(a) The temperature on a warm summer day is \(87{ }^{\circ} \mathrm{F}\). What is the temperature in \({ }^{\circ} \mathrm{C} ?\) (b) Many scientific data are reported at \(25{ }^{\circ} \mathrm{C}\). What is this temperature in kelvins and in degrees Fahrenheit? (c) Suppose that a recipe calls for an oven temperature of \(175^{\circ} \mathrm{F}\). Convert this temperature to degrees Celsius and to kelvins. (d) The melting point of sodium bromide (a salt) is \(755^{\circ} \mathrm{C}\). Calculate this temperature in \({ }^{\circ} \mathrm{F}\) and in kelvins. (e) Neon, a gaseous element at room temperature, is used to make electronic signs. Neon has a melting point of \(-248.6^{\circ} \mathrm{C}\) and a boiling point of \(-246.1^{\circ} \mathrm{C}\). Convert these temperatures to kelvins.

Indicate which of the following are exact numbers: (a) the mass of a paper clip, (b) the surface area of a dime, (c) the number of inches in a mile, (d) the number of ounces in a pound, (e) the number of microseconds in a week, (f) the number of pages in this book.

The liquid substances mercury (density \(=13.5 \mathrm{~g} / \mathrm{mL}\) ), water \((1.00 \mathrm{~g} / \mathrm{mL})\), and cyclohexane \((0.778 \mathrm{~g} / \mathrm{mL})\) do not form a solution when mixed, but separate in distinct layers. Sketch how the liquids would position themselves in a test tube.
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