Log out Go to App
Go to App

Learning Materials

Features

Discover

Chapter 1: Problem 65

Classify each of the following as a pure substance, a solution, or a heterogeneous mixture: \((\mathbf{a})\) a leaf, \((\mathbf{b})\) a 999 gold bar, (c) stainless steel.

Short Answer

Expert verified
a) A leaf can be classified as a \(\underline{\text{heterogeneous mixture}}\) since its components are not uniformly distributed. b) A 999 gold bar can be classified as a \(\underline{\text{solution}}\) as it contains 99.9% gold and only 0.1% impurities mixed at the molecular level. c) Stainless steel is classified as a \(\underline{\text{solution}}\) since it is an alloy with various elements mixed uniformly at the atomic level.

Step by step solution

01

Classification of a Leaf

A leaf is a part of a plant and consists of various cells, including chlorophyll and other components. Since the different components of a leaf are not uniformly distributed, we can classify a leaf as a \(\underline{\text{heterogeneous mixture}}\).
02

Classification of a 999 Gold Bar

A 999 gold bar is a gold bar that is made up of 99.9% gold, meaning it only contains 0.1% of impurities. Although it is not completely pure, this high level of gold concentration can be considered as a solution. Therefore, we classify a 999 gold bar as a \(\underline{\text{solution}}\).
03

Classification of Stainless Steel

Stainless steel is an alloy composed mostly of iron along with varying amounts of carbon, chromium, and other elements. These elements are mixed at the atomic level and distributed uniformly throughout the material. Therefore, stainless steel is classified as a \(\underline{\text{solution}}\).

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

A sample of ascorbic acid (vitamin C) is synthesized in the laboratory. It contains \(1.50 \mathrm{~g}\) of carbon and \(2.00 \mathrm{~g}\) of oxygen. Another sample of ascorbic acid isolated from citrus fruits contains $6.35 \mathrm{~g}$ of carbon. According to the law of constant composition, how many grams of oxygen does it contain?

(a) A sample of tetrachloroethylene, a liquid used in dry cleaning that is being phased out because of its potential to cause cancer, has a mass of \(40.55 \mathrm{~g}\) and a volume of \(25.0 \mathrm{~mL}\) at $25^{\circ} \mathrm{C}$. What is its density at this temperature? Will tetrachloroethylene float on water? (Materials that are less dense than water will float.) (b) Carbon dioxide \(\left(\mathrm{CO}_{2}\right)\) is a gas at room temperature and pressure. However, carbon dioxide can be put under pressure to become a "supercritical fluid" that is a much safer dry-cleaning agent than tetrachloroethylene. At a certain pressure, the density of supercritical \(\mathrm{CO}_{2}\) is \(0.469 \mathrm{~g} / \mathrm{cm}^{3}\). What is the mass of a \(25.0-\mathrm{mL}\) sample of supercritical \(\mathrm{CO}_{2}\) at this pressure?

A watt is a measure of power (the rate of energy change) equal to $1 \mathrm{~J} / \mathrm{s}$. (a) Calculate the number of joules in a kilowatt- hour. (b) An adult person radiates heat to the surroundings at about the same rate as a 100 -watt electric incandescent light bulb. What is the total amount of energy in kcal radiated to the surroundings by an adult over a 24 h period?

The U.S. quarter has a mass of \(5.67 \mathrm{~g}\) and is approximately $1.55 \mathrm{~mm}$ thick. (a) How many quarters would have to be stacked to reach \(575 \mathrm{ft}\), the height of the Washington Monument? (b) How much would this stack weigh? (c) How much money would this stack contain? (d) The U.S. National Debt Clock showed the outstanding public debt to be $\$ 16,213,166,914,811\( on October \)28,2012 .$ How many stacks like the one described would be necessary to pay off this debt?

Judge the following statements as true or false. If you believe a statement to be false, provide a corrected version. (a) Air and water are both elements. (b) All mixtures contain at least one element and one compound. (c) Compounds can be decomposed into two or more other substances; elements cannot. (d) Elements can exist in any of the three states of matter. (e) When yellow stains in a kitchen sink are treated with bleach water, the disappearance of the stains is due to a physical change. (f) A hypothesis is more weakly supported by experimental evidence than a theory. (g) The number 0.0033 has more significant figures than 0.033 . (h) Conversion factors used in converting units always have a numerical value of one. (i) Compounds always contain at least two different elements.
See all solutions

Recommended explanations on Chemistry Textbooks

Inorganic Chemistry

Read Explanation

Chemistry Branches

Read Explanation

Chemical Analysis

Read Explanation

The Earths Atmosphere

Read Explanation

Nuclear Chemistry

Read Explanation

Kinetics

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.

Sign-up for free