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Chapter 1: Problem 74

Define the following terms: solid, liquid, gas, pure substance, element, compound, homogeneous mixture, heterogeneous mixture, solution, chemical change, physical change.

Short Answer

Expert verified
Solid: State of matter with definite shape and volume; particles closely packed and limited movement. Examples: ice, wood, metal. Liquid: State of matter with definite volume but no definite shape; particles less closely packed, allowing flow. Examples: water, oil, blood. Gas: State of matter with no definite shape or volume; particles more spaced out, allowing expansion and compression. Examples: air, hydrogen, oxygen. Pure Substance: Matter with consistent composition and properties; can be an element or compound. Examples: water, gold. Element: Pure substance that cannot be broken down chemically; made of one type of atom. Examples: carbon, oxygen, hydrogen. Compound: Pure substance formed from two or more elements chemically combined; fixed ratio. Examples: water (H2O), carbon dioxide (CO2), table salt (NaCl). Homogeneous Mixture: Substances uniformly mixed and have consistent composition. Examples: air, sugar dissolved in water. Heterogeneous Mixture: Substances not uniformly mixed, different compositions in different parts. Examples: sand and water, oil and water, mixed nuts. Solution: Homogeneous mixture where solute is dissolved in solvent. Examples: saltwater. Chemical Change: Process transforming substances into new substances with different properties; involves rearrangement of atoms/molecules. Examples: burning wood, photosynthesis, rusting iron. Physical Change: Process altering physical properties without changing chemical composition. Examples: melting ice, breaking glass, inflating balloon.

Step by step solution

01

Solid

A solid is a state of matter characterized by its definite shape and volume. The particles in a solid are closely packed together and have limited movement, resulting in a well-defined structure. Examples of solids include ice, wood, and metal.
02

Liquid

A liquid is a state of matter that takes the shape of its container and has a definite volume but no definite shape. The particles in a liquid are less closely packed than in a solid, allowing the liquid to flow. Examples of liquids include water, oil, and blood.
03

Gas

A gas is a state of matter that has no definite shape or volume, assuming the shape and volume of its container. The particles in a gas are more spaced out than in solids and liquids, allowing the gas to expand and compress easily. Examples of gases include air, hydrogen, and oxygen.
04

Pure Substance

A pure substance is a form of matter that has a consistent composition and properties throughout. It can be either an element or a compound. Examples of pure substances include water (a compound) and gold (an element).
05

Element

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Elements are made up of one type of atom, with each element having its unique atomic number. Examples of elements include carbon, oxygen, and hydrogen.
06

Compound

A compound is a pure substance formed by the chemical combination of two or more elements in a fixed ratio. Compounds can only be separated by chemical means. Examples of compounds include water (H2O), carbon dioxide (CO2), and table salt (NaCl).
07

Homogeneous Mixture

A homogeneous mixture is a combination of substances that are uniformly mixed and have a consistent composition throughout. The different components of a homogeneous mixture cannot be seen individually. Examples of homogeneous mixtures include air (a mixture of gases) and sugar dissolved in water (a solution).
08

Heterogeneous Mixture

A heterogeneous mixture is a combination of substances that are not uniformly mixed and have different compositions in different parts of the mixture. The individual components can typically be visually distinguished. Examples of heterogeneous mixtures include sand and water, oil and water, and a bowl of mixed nuts.
09

Solution

A solution is a type of homogeneous mixture where one substance (the solute) is dissolved in another substance (the solvent). Solutions can be in the solid, liquid, or gaseous state, but the most common example is a liquid solution like saltwater.
10

Chemical Change

A chemical change is a process in which one or more substances are transformed into new substances with different properties. This change occurs at the molecular level and involves a rearrangement of atoms or molecules. Examples of chemical changes include burning wood, photosynthesis, and the rusting of iron.
11

Physical Change

A physical change is a process that alters the physical properties of a substance, such as its shape, size, or state (solid, liquid, or gas), without changing its chemical composition. The molecules or atoms of the substance remain unchanged. Examples of physical changes include melting ice, breaking a glass, and inflating a balloon.

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Most popular questions from this chapter

Ethylene glycol is the main component in automobile antifreeze. To monitor the temperature of an auto cooling system, you intend to use a meter that reads from 0 to 100 . You devise a new temperature scale based on the approximate melting and boiling points of a typical antifreeze solution \(\left(-45^{\circ} \mathrm{C}\right.\) and \(\left.115^{\circ} \mathrm{C}\right)\). You wish these points to correspond to \(0^{\circ} \mathrm{A}\) and \(100^{\circ} \mathrm{A}\), respectively. a. Derive an expression for converting between \({ }^{\circ} \mathrm{A}\) and \({ }^{\circ} \mathrm{C}\). b. Derive an expression for converting between \({ }^{\circ} \mathrm{F}\) and \({ }^{\circ} \mathrm{A}\). c. At what temperature would your thermometer and a Celsius thermometer give the same numerical reading? d. Your thermometer reads \(86^{\circ} \mathrm{A} .\) What is the temperature in \({ }^{\circ} \mathrm{C}\) and in \({ }^{\circ} \mathrm{F}\) ? e. What is a temperature of \(45^{\circ} \mathrm{C}\) in \({ }^{\circ} \mathrm{A}\) ?

Perform the following mathematical operations, and express the result to the correct number of significant figures. a. \(6.022 \times 10^{23} \times 1.05 \times 10^{2}\) b. \(\frac{6.6262 \times 10^{-34} \times 2.998 \times 10^{8}}{2.54 \times 10^{-9}}\) c. \(1.285 \times 10^{-2}+1.24 \times 10^{-3}+1.879 \times 10^{-1}\) d. \(\frac{(1.00866-1.00728)}{6.02205 \times 10^{2.3}}\) e. \(\frac{9.875 \times 10^{2}-9.795 \times 10^{2}}{9.875 \times 10^{2}} \times 100(100\) is exact) f. \(\frac{9.42 \times 10^{2}+8.234 \times 10^{2}+1.625 \times 10^{3}}{3}(3\) is exact)

You go to a convenience store to buy candy and find the owner to be rather odd. He allows you to buy pieces in multiples of four, and to buy four, you need \(\$ 0.23 .\) He only allows you to do this by using 3 pennies and 2 dimes. You have a bunch of pennies and dimes, and instead of counting them, you decide to weigh them. You have \(636.3 \mathrm{~g}\) of pennies, and each penny weighs \(3.03 \mathrm{~g}\). Each dime weighs \(2.29 \mathrm{~g}\). Each piece of candy weighs \(10.23 \mathrm{~g}\). a. How many pennies do you have? b. How many dimes do you need to buy as much candy as possible? c. How much should all these dimes weigh? d. How many pieces of candy could you buy? (number of dimes from part b) e. How much would this candy weigh? f. How many pieces of candy could you buy with twice as many dimes?

Classify each of the following as a mixture or a pure substance. a. water f. uranium b. blood g. wine c. the oceans h. leather d. iron i. table salt e. brass Of the pure substances, which are elements and which are compounds?

Perform the following unit conversions. a. Congratulations! You and your spouse are the proud parents of a new baby, born while you are studying in a country that uses the metric system. The nurse has informed you that the baby weighs \(3.91 \mathrm{~kg}\) and measures \(51.4 \mathrm{~cm}\). Convert your baby's weight to pounds and ounces and her length to inches (rounded to the nearest quarter inch). b. The circumference of the earth is \(25,000 \mathrm{mi}\) at the equator. What is the circumference in kilometers? in meters? c. A rectangular solid measures \(1.0 \mathrm{~m}\) by \(5.6 \mathrm{~cm}\) by \(2.1 \mathrm{dm} .\) Express its volume in cubic meters, liters, cubic inches, and cubic feet.
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