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Chapter 12: Problem 1

Classify the following as solutions or heterogeneous mixtures: (a) \(\mathrm{A}\) hot cup of instant coffee (b) Chicken vegetable soup (c) Unfiltered blood (d) Filtered blood plasma (e) A chromium-plated steel automobile bumper (f) A stainless steel automobile bumper (stainless steel is prepared by combining iron, Fe, up to \(30 \%\) chromium, \(\mathrm{Cr}\), and smaller amounts of nickel, \(\mathrm{Ni}\), and carbon, \(C\), and heating the mixture until it becomes molten)

Short Answer

Expert verified
(a) Solution (b) Heterogeneous mixture (c) Heterogeneous mixture (d) Solution (e) Heterogeneous mixture (f) Solution

Step by step solution

01

(a) Hot cup of instant coffee

Instant coffee is made by dissolving coffee in hot water. In this process, coffee and water mix uniformly together to form a homogeneous mixture. Therefore, a hot cup of instant coffee is a solution.
02

(b) Chicken vegetable soup

Chicken vegetable soup contains various components such as chunks of chicken, various vegetables, and liquid broth. These components are not uniformly distributed at molecular level and can be easily separated. Therefore, chicken vegetable soup is a heterogeneous mixture.
03

(c) Unfiltered blood

Unfiltered blood is a complex mixture containing various components, such as red and white blood cells, platelets, and plasma. These components are not evenly distributed and can be separated (e.g., by centrifugation). Thus, unfiltered blood is a heterogeneous mixture.
04

(d) Filtered blood plasma

Filtered blood plasma is the liquid portion of the blood, after the blood cells and other cellular components have been removed. It is a homogeneous mixture of water, electrolytes, proteins, and other dissolved substances. Therefore, filtered blood plasma is a solution.
05

(e) A chromium-plated steel automobile bumper

A chromium-plated steel automobile bumper is a solid object with a layer of chromium electroplated onto the surface of the steel. The chromium and steel are not mixed together uniformly at the molecular level, and their layers are distinct. Thus, a chromium-plated steel automobile bumper is a heterogeneous mixture.
06

(f) A stainless steel automobile bumper

Stainless steel is an alloy made by combining iron (Fe), up to 30% chromium (Cr), and smaller amounts of nickel (Ni) and carbon (C). The components are heated together until molten and then cooled to form a solid, uniform material. As the components are uniformly mixed together, a stainless steel automobile bumper is considered a solution.

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Most popular questions from this chapter

A \(25.00 \mathrm{~mL}\) sample of aqueous sulfuric acid of unknown concentration is neutralized by \(27.55\) \(\mathrm{mL}\) of \(1.0002 \mathrm{M} \mathrm{NaOH}(a q)\) (a) Write a net ionic equation for this acid-base neutralization reaction. (b) How many moles of \(\mathrm{NaOH}\) did it take for the neutralization? (c) How many moles of sulfuric acid were neutralized? (d) What is the molar concentration of the sulfuric acid?

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