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Chapter 1: Problem 14

Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (a) air, (b) tomato juice, (c) iodine crystals, (d) sand.

Short Answer

Expert verified
(a) Air is a homogeneous mixture, (b) Tomato juice is a homogeneous mixture, (c) Iodine crystals are a pure substance, and (d) Sand is a heterogeneous mixture.

Step by step solution

01

Air

Air is a mixture of different gases, such as nitrogen, oxygen, and carbon dioxide, and their distribution is even. Therefore, air is considered a homogeneous mixture.
02

Tomato Juice

Tomato juice is a mixture of water, tomato solids, and other components like vitamins and minerals. These components are evenly distributed and cannot be distinguished visually. Thus, tomato juice is a homogeneous mixture.
03

Iodine Crystals

Iodine crystals are made up of only iodine molecules, and there are no other components or elements mixed in. As a result, iodine crystals are a pure substance.
04

Sand

Sand is made up of small particles of rocks and minerals, such as quartz, feldspar, and mica, and these particles are easily distinguishable. Therefore, sand is considered a heterogeneous mixture.

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Most popular questions from this chapter

A solid white substance A is heated strongly in the absence of air. It decomposes to form a new white substance \(B\) and a gas C.The gas has exactly the same properties as the product obtained when carbon is burned in an excess of oxygen. Based on these observations, can we determine whether solids \(\mathrm{A}\) and \(\mathrm{B}\) and gas \(\mathrm{C}\) are elements or compounds?

(a) Calculate the kinetic energy, in joules of a 1200 -kg automobile moving at 18 \(\mathrm{m} / \mathrm{s}\) . ( b ) Convert this energy to calories.(c) When the automobile brakes to a stop is the "lost" kinetic energy converted mostly to heat or to some form of potential energy?

Two positively charged particles are first brought close together and then released. Once released, the repulsion between particles causes them to move away from each other. (a) This is an example of potential energy being converted into what form of energy? (b) Does the potential energy of the two particles prior to release increase or decrease as the distance between them is increased.

Classify each of the following as a pure substance, a solution, or a heterogeneous mixture: (a) a gold ingot, (b) a cup of coffee, (c) a wood plank.

What is the number of significant figures in each of the following measured quantities? (a) \(601 \mathrm{kg},\) (b) 0.054 \(\mathrm{s}\) ,(c) \(6.3050 \mathrm{cm},(\mathbf{d}) 0.0105 \mathrm{L},(\mathbf{e}) 7.0500 \times 10^{-3} \mathrm{m}^{3},(\mathbf{f}) 400 \mathrm{g}\)
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