The latest stable version of Pencil is 3.1.0 which contains stability fixes and many new features. Is ELECTRICITY an element, compound, mixture, or none? It is soft and slippery, and its hardness is less than one on the Mohs scale. The first users of graphite simply dug this mineral out of the hills and discovered it could be sawed into sticks and used as an excellent writing tool. [226] <>stream Any given spoonful of soup will contain varying amounts of the different vegetables and other components of the soup. A heterogeneous mixture consists of two or more phases. A homogeneous mixture is a mixture in which the composition is uniform throughout the mixture. Amazon's Choice BIC Xtra-Smooth Mechanical Pencils With Erasers, Medium Point (0.7mm), 10-Count Pack, Mechanical Pencils for School or Office Supplies (MPP101-BLK) 4.8 (11,435) $479 ($0.48/Count) Chemical properties of a substance are those that can be observed without changing the composition of a substance. A heterogeneous mixture is a mixture in which the composition is not uniform throughout the mixture. Gold (Au), Magnesium (Mg), Chlorine (Cl), Hydrogen (H), Contains more than one kind of matter that are chemically joined together and they CANNOT be physically separated, Baking Soda (NaHCO3), Vinegar (C2H4O2), Water (H2O), A combination of two or more pure substances that are NOT chemically combined, they are physically combined. Decide whether a substance is chemically pure. Cross-Platform Pencil2D is cross-platform and runs on Windows, macOS, Linux & FreeBSD. Is BRITTLENESS an intensive or extensive property? What are some examples of homogeneous mixtures? Compounds are made up of one or more element. When we speak of a pure substance, we are speaking of something that contains only one kind of matter. These are all examples of a pure substance. Up to 20 pieces of lead can be inserted through the eraser end of the pencil and continuously fed to the point. Freezing Point: The temperature at which the liquid freezes to become a solid. pure substance A substance that is made up of only one type of stuff Examples of pure substances include purified water, oxygen, gold You can also use your keyboard to move the cards as follows: If you are logged in to your account, this website will remember which cards you know and don't know so that they Each of the layers is called a phase. <> Depending on the shapes in which the carbon atoms are bonded, pure carbon can take on many forms. Aluminum, which is used in soda cans, is an element. A large deposit of graphite was discovered in 1565 on the approach to Grey Knotts from the hamlet of Seathwaite in Borrowdale parish, Cumbria, England. endobj Is BOILING POINT a physical or chemical property? Accessible across all of today's devices: phones, tablets, and desktops. Is WOOD an element, compound, mixture, or none? Flammability of gasoline is a chemical property. heterogeneous. 0000232458 00000 n endobj And on iPad Pro, Apple Pencil hover shows you exactly where your Apple Pencil will touch down on your display, so you can write, sketch, and illustrate with even greater precision. Often it is easy to confuse a homogeneous mixture with a pure substance because they are both uniform. In 1821, Charles Dunbar (author/Henry David Thoreaus brother-in-law) discovered a graphite deposit in New England that proved to be of a quality superior to any previously found in the United States (though not typically up to the European quality). =; IY;[d+5L>8e5`f!_oLOqEbjAcy` Is MASS an intensive or extensive property? (Ti), Is IRON an element, compound, mixture, or none? The pencils are painted, labeled, then coated with three to 12 layers of lacquer. Suppose it took 108 joules of energy to raise a bar of gold from 25.0C to 29.7C. Elements and compounds are both examples of pure substances. The only relevant concern may be the yellow paint used to color the outside of them. to send you a reset link. Graphite is an allotrope of the element carbon (the other being diamond). It has an extended network of carbon atoms or otherwise known as a macrom The common name pencil lead is due to an historic association with the stylus made of lead in ancient Roman times. Make sure to remember your password. Pencil manufacture (click to enlarge image). 142 0 obj endobj Because carbon dioxide is dissolved in water, we can infer from the behavior of salt crystals dissolved in water that carbon dioxide dissolved in water is (also) a homogeneous mixture. Mixtures can be uniform (called ___________________) and are known as solutions. A 15.0 gram lead ball at 25.0C was heated with 40.5 joules of heat. A heterogeneous mixture is a mixture in which the composition is not uniform throughout the mixture. Some basic sets of color pencils come with 12 or 24 colors per carton, but other high quality sets for art purposes include up to 120 different colors or more. Aquarelle or water color pencils are color leads with the added feature of being washable in water, producing an effect similar to watercolor paints. Cosmetic pencils are special color leads used for make-up purposes, such as eye or lip liner. Finally, pastel pencils are another type of color pencils that make a mark resembling chalk, looking especially beautiful on dark papers. Is ELASTICITY an intensive or extensive property? (C), Element - on the periodic table(only one capital letter). 0000004253 00000 n It remains the only large-scale deposit of graphite ever found in this solid form. In fact, contrary to what many people believe, lead pencils never were made with lead. A teacher walks into the Classroom and says If only Yesterday was Tomorrow Today would have been a Saturday Which Day did the Teacher make this Statement? endobj 135 0 obj A measurement of how acidic or basic a substance is. Lead was used by the ancient Greeks and Romans for marking or for drawing lines. The first users of graphite simply dug this mineral out of the hills and discovered it could be sawed Most pencils used for writing on paper are round or six-sided; others may be triangular, flat, or tapered. Topics: It is in this sense that the word is still used. How does graphite behave differently from diamonds? <> <>/MediaBox[0 0 612 792]/Parent 19 0 R/Resources<>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI]/XObject<>>>/Rotate 0/StructParents 0/Tabs/S/Type/Page>> Vegetable soup is a heterogeneous mixture. Water is a substance; more specifically, because water is composed of hydrogen and oxygen, it is a compound. Terms of Service. av8l>b" R,&03g7 \!.fb`22x@ 8 More specifically, because water is composed of hydrogen and oxygen, it is a compound. Figure \(\PageIndex{3}\): Types of Mixtures Thinkstock On the left, the combination of two substances is a heterogeneous mixture because the particles of the two components look different. compound. Elements and compounds are both examples of pure substances. 0000207594 00000 n What is the main difference between a lead pencil and a mechanical pencil? Often times, they come together to form groups of atoms called molecules. Details. This technique is still used today. This property also makes graphite powder an ideal dry lubricant. Measures how easy it is to pound something into thin sheets. Which of the following statements is false? WebWhat does the number on the pencil mean? Pencils have also been called lead pencils because long time ago (Romans) writing material was lead (Plumbum, Pb) metal. After the discovery of g To share with more than one person, separate addresses with a comma. WebStudy with Quizlet and memorize flashcards containing terms like air(), brass (copper and zinc), carbon dioxide and more. What type of energy is associated with the burning of gasoline? Golf pencils personalized with your custom text imprint. You may dissolve a small amount of salt or a large amount into a given amount of water. Your email address is only used to allow you to reset your password. Is VOLUME a physical or chemical property? 0000000016 00000 n ", "Pencil swallowing: MedlinePlus Medical Encyclopedia", "graphite pencils | The Weekend Historian", "Lead Facts - Uses, Properties, Element Pb, Plumbing, Pipes, Weights", https://en.wikipedia.org/w/index.php?title=Graphite_pencil&oldid=1118589861, Articles with German-language sources (de), Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 27 October 2022, at 20:54. [15] A 1:1 ratio roughly corresponds to the 3H hardness. Lucky charms cereal, Salad, Chicken noodle soup. The pure substance formed, N a C l NaCl N a Cl, is formed through electrostatic interactions, not the much stronger chemical bonds of covalently bonded atoms that form molecules. Improved homework resources designed to support a variety of curriculum subjects and standards. 12 13 Gases are the only form of matter that is easily compressible. Aside from biological molecules, carbon can also be found in nature in pure mineral form. Think differently. An element an atom, not a molecule. A plastic is a type of combination of molecules by multiple hydrogen bonds that create great The carbon sheet fragments readily rub off the pencil core and onto the paper. By continuing to use this site, you consent to the terms of our cookie policy, which can be found in our. Melting Point: The temperature at which the solid melts to become a liquid. Is SOLUBILITY an intensive or extensive property? Reasoning that they must have been carried a long distance downstream, he trekked some 270 miles until he came to the source of his discovery. Your email address is only used to allow you to reset your password. (U). A consequence is that ice floats on water. What is the value of x when the block comes to rest momentarily? Pencils have also been called lead pencils because long time ago (Romans) writing material was lead (Plumbum, Pb) metal. a;G/M~l startxref Show that $x^{\prime}$ satisfies a differential equation for simple harmonic motion. Lead (Pb) is an element. Pb - Wolfram|Alpha [ http://www.wolframalpha.com/input/?i=Pb ] Can be observed or measured without changing the composition, Properties that do NOT depend on the amount of the matter present, Properties that DO depend on the amount of the matter present. These composite graphite-clay leads allowed for more efficient use of graphite and revolutionized the pencil industry. Is PEPSI a heterogeneous mixture, homogeneous mixture, compound, or element? If a solid piece of shiny sodium metal is exposed to chlorine gas, a large amount of heat is released and the white solid sodium chloride (table salt) forms. 146 0 obj This substance was historically misidentified as lead and the name stuck. Graphite came into widespread use following the discovery of a large graphite deposit in Borrowdale, England in 1564. Also, pure water is less dense than seawater, so fresh water can float on top of salt water, mixing at the interface. Stephen Lower, Professor Emeritus (Simon Fraser U.) A measure of a material's ability to conduct an electric current (or heat). <>stream WebGraphite (pencil lead) is pure carbon just like a diamond. endobj <>stream (CO2), Is SUGAR an element, compound, mixture, or none? Click hereto learn more about the HB Scale for grading graphite leads. 137 0 obj Pencils contain a form of solid carbon known as graphite. Write the entire word in The result was a new type of durable pencil lead. Have a distinct set of physical properties <>stream 0000231081 00000 n 131 0 obj 132 0 obj 0000242966 00000 n >>mGM7FWMGX Iw>DQ[M0"Pw`8Zb:mI/}J=,0p&A](g9+N'p:ua 0000009010 00000 n (Fe). WebA pure substance is: A) composed of two or more different types of atoms or molecules combined in variable proportions. When oil and water are combined, they do not mix evenly, but instead form two separate layers. <>/Filter/FlateDecode/Index[22 109]/Length 26/Size 131/Type/XRef/W[1 1 1]>>stream When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. <> We wish to show that the ensuing motion of the block is simple harmonic. The core of a pencil does not contain lead and never has. an amalgam, a combination of some other metals dissolved in a small amount of mercury, aluminum oxide, a white powder that contains a 2:3 ratio of aluminum and oxygen atoms. endobj The prototypical pencil may have been the ancient Roman stylus, which was a thin metal stick used for scratching on papyrus, often made of lead. (c) Call the initial configuration of the system that existing just as the block is released from rest. Note that the density of pure water is defined to be 1 gram per cubic centimeter (or, g/ml). (Au). For example, water is a compound composed of the elements hydrogen and oxygen. The writing substance in a pencil is a combination of graphite and a special puttylike clay. Minimal Design Lightweight and easy to use so you can focus on animating and not what button to hit next. 5 offers from $10.48. If the buoyant force is greater than its weight, the object floats. By definition, a pure substance or a homogeneous mixture consists of a single phase. 149 0 obj This slippery-sheet structure is what makes graphite so oily to the touch and makes it such a good material to write with. 0000007541 00000 n 0 endstream Each pencil must be shaped and sanded. Mixtures can also be non-uniform (called ____________________). (NH3). 0000005923 00000 n A property that helps identify the substance, Describes the relationship between the mass and volume of an object and how tightly packed the atoms or molecules are in a substance. Identify the following combinations as heterogeneous mixtures or homogenous mixtures. a.$~~8.43 \mathrm{~cm}$ to millimeters. in the right column. Freezing Point = Melting Point. If a substance can be separated into its elements, it is a compound. 0000002538 00000 n BIC Xtra-Smooth Mechanical Pencils With Erasers, Medium Point (0.7mm), 10-Count Pack, Mechanical Pencils for School or Office Supplies (MPP101-BLK) 11,155. Is PHASE an intensive or extensive property? The pencil shell is typically wooden, but can be made of plastic or recycled paper. $$ A solid form of matter in which there is long range repeating order is called ________. is not a pure substance it is a mixture, Mercury is an element therefore a pure substance. Which of the following is NOT an example of matter? Though people refer to lead pencils, a pencil actually contains no lead. in the right column. If a substance is not Contact. <> Well first of all, is it on the periodic table? If it is then it is an element. If it isn't then it isn't an element. As far as I can tell, eleon i Is HARDNESS an intensive or extensive property? WebThe writing substance in a pencil is a combination of graphite and a special puttylike clay. Based on this information, which of the following statements is TRUE? After translating an article, all tools except font up/font down will be disabled. If youre looking for information on potential lead exposure risks in pencils, Click here. In the United States alone, consumers purchase more than 2 1/2 billion pencils a year. During the first seven years of operation, the mine produced graphite of marginal quality. Water is a substance. If, however, you mixed table salt with ground pepper, you would still be able to see the individual grains of each of them and, if you were patient, you could take tweezers and carefully separate them back into pure salt and pure pepper. How many kilojoules are there in 95.0 Calories? The salt dissolved in water is a homogeneous mixture, or a solution (Figure \(\PageIndex{3}\)). How would a chemist categorize each example of matter? (C). Packing in supplies by reindeer, Alibert set up a mine at this mountainous site near the Chinese border. endstream 0000208448 00000 n Is KRYPTON an element, compound, mixture or none? Each of the layers is called a phase. The way light interacts with the surface of a substance. The common name pencil lead is due to an historic association with the stylus made of lead in ancient Roman times. Mixtures can be classified as homogeneous or heterogeneous. The pencils are put into boxes, ready for shipment. WebHistory. Lead sizes for automatic pencils range from about 0.01 to 0.03 inch (0.03 to 0.08 centimeter). So, no, it is NOT a compound mixture. Is VISCOSITY a physical or chemical property? Is FREEZING POINT/ MELTING POINT an intensive or extensive property? An element _____________ be separated into simpler materials. WebHeres a myth buster: There is no lead in pencils. <>/Metadata 20 0 R/Pages 19 0 R/StructTreeRoot 22 0 R/Type/Catalog>> Then a rich and unbroken deposit of the highest-quality graphite was uncovered; a find that yielded pieces of pure ore weighing as much as 80 pounds! Lead is an element. A compound is a substance that cannot be broken down into a simpler substance. *Note: pure oxygen gas consists of molecules but it is still considered an element, rather than a compound, as the molecules are made up of a single type of element. No, pencil lead is made from graphite, which is a different substance from graphene. Graphene is a sheet of carbon only a single atom thick, wherea Yes, A pencil is a mixture because it can be separated. HR0s We hope you and your family enjoy the NEW Britannica Kids. 0000006059 00000 n 0000006462 00000 n How many joules are there in a 255 calorie snack bar? The properties of a compound are usually __________________ than the properties of the elements it contains. If you've accidentally put the card in the wrong box, just click on the card to take it out of the box. Graphite (a pencil lead) is the element carbon. It is considered a substance because it has a uniform and definite composition. Each carbon atom in the sheet is bonded to the three nearest carbon atoms. The block is released from rest when the spring is unstretched (at x = 0). In The United States, the Consumer Product Safety Commission regulates that the lead used in paint be no more than ninety parts per million, which is well below the You would need to create a new account. When sufficient stores of graphite had been accumulated, the mines were flooded to prevent theft until more was required. This was similar to the modern stylus used with smartphones and tablets, except it was bigger and made from lead. Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. WebIf the material is a pure substance, further classify it as either an element or compound in the right column. The word pencil comes from the Latin word penicillus which means "little tail". Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page. An element is a pure substance that contains only one kind of ________________? (a) Show that this equation has two solutions of the form $\psi(x)=e^{\gamma x}$, where $\gamma$ is either solution of the quadratic equation $a \gamma^2+b \gamma+c=0$. Artists drawing pencils range from the softest, 8B, to the hardest, F. The designation for drafting pencils is from HB, the softest, to 10H, the hardest. The town of Keswick, near the original findings of block graphite, still manufactures pencils, the factory also being the location of the Cumberland Pencil Museum. Pencil lead is actually not lead (Pb) at all, but it is graphite. Given the specific heat of lead is. Is BRONZE an element, compound, mixture, or none? _bwHmleVl%#FD(E-8Z=,y+w,z IJ>FVoU*Sy&/Pe71/n v*M?2cPs^~nahu;./-v?Tte[U:S7alp;;fO~$C5i;3 Many physical problems lead to a differential equation of the form Chem1 Virtual Textbook. endstream 0000186721 00000 n The LibreTexts libraries arePowered by NICE CXone Expertand are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. WebMatter is either pure or a mixture. How would a chemist categorize each example of matter? To re-enable the tools or to convert back to English, click "view original" on the Google Translate toolbar. or . Assuming that the iron and sulfur are simply mixed together, it should be easy to see what is iron and what is sulfur, so this is a heterogeneous mixture. Stephen Lower, Professor Emeritus (Simon Fraser U.) (CH3OH), Is SALT an element, compound, mixture, or none? None - energy doesn't go into any of the three categories. This method mixed powdered graphite and clay in a water slurry, then formed sticks which hardened in a kiln. Salt easily dissolves in water, but salt water cannot be classified as a substance because its composition can vary. Measures an object's tendency to shatter upon impact. B) composed of only one type of atom or molecule. endobj A material can be classified as either an element (like gold), compound (like water) or mixture (like ocean water). An element is composed of ident 0000001859 00000 n C) those that a substance displays without changing its composition. Explain the difference between an element and a compound. For example sodium is a soft shiny metal and chlorine is a pungent green gas. endobj A large deposit of graphite was discovered in 1565 on the approach to Grey Knotts from the hamlet of Seathwaite in Borrowdale parish, Cumbria, England. Measures how hard it is to break something by pulling. A pure substance is a form of matter that has a constant composition (meaning that it is the same everywhere) and properties that are constant throughout the sample (meaning that there is only one set of properties such as melting point, color, boiling point, etc. England would enjoy a monopoly on the production of pencils until a method of reconstituting the graphite powder was found in 1662 in Italy. Almost everyonefrom schoolchildren to presidents and prime ministersuses pencils every day. Measures how difficult it is to scratch an object. (b) Prove that any linear combination of these two solutions is itself a solution. Mixture - ink is made up of two or more dyes, Is TITANIUM an element, compound, mixture, or none? Is LUSTER an intensive or extensive property? A mixture is a physical blend of two or more components, each of which retains its own identity and properties in the mixture. Explain the difference between a homogeneous mixture and a heterogeneous mixture. [6][7] Because the pencil core is still referred to as "lead", or a "lead", many people have the misconception that the graphite in the pencil is lead,[8] even though it never contained the element lead. Is SILVER a heterogeneous mixture, homogeneous mixture, compound, or element? 2^ZmRQ78&urz(V{inC,uU%7T)@\D_}ScI8. Details. 133 0 obj At the pencil factory, machines plane the slats smooth then cut grooves in each slat in parallel rows. A heterogeneous mixture consists of two or more phases. A pen has a tip, usually made of metal, with liquid ink coming out and onto the paper. After the leads have cooled, they are immersed in molten wax, a treatment that makes the lead write more smoothly. Mixture - you can physically separate everything. No, the color pencils are not made out of graphite, which is a very thin and precise They are often solutions. (NaCl). A pure substance is a form of matter that has a constant composition and A pencil ( / pnsl / ( listen)) is a writing or drawing implement with a solid pigment core in a protective casing that reduces the risk of core breakage, and keeps it from marking the user's hand. <> <> #2. Is CONDUCTIVITY a physical or chemical property? A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. 0000187714 00000 n Is SALT WATER a heterogeneous mixture, homogeneous mixture, compound, or element? No. Because , Law of Constant Proportion states that a chemical compound always contains exactly the same proportion of elements by mass. This law A substance that cannot be broken down into chemically simpler components is an element. [14], Production technology has changed little over the past 120 years; only standards and mechanisms for the manufacture of graphite rods and wooden halves have improved. r4Hv`gSRXhCCunHl%%Xl9lVzOy7#4 :gtJ6&C}~OyyX3@"wyA0,RL>,KTKJQ/[y These make a very dark black mark on the paper compared to even very soft graphite pencils, such as 8B. Color pencil leads, also used by artists and popular with children and students, are made through a similar process of creating a blend of pigment, china clay and wax that is extruded into a lead. 0000005792 00000 n A mixture that is NOT the same throughout. WebThough people refer to lead pencils, a pencil actually contains no lead. It changes the substance you're measuring into a new substance. endstream All samples of sodium chloride are chemically identical. Hex Golf - Text Only. how many grams of oxygen must have reacted? They can easily be separated by physical mean such as filtering, cooling, sorting, or heating, Homogeneous Mixture (also known as a solution). The ancient Romans used a writing device called a stylus. Is DENSITY an intensive or extensive property? Element: a substance that is made up of only one type of atom. When the War of 1812 stopped the import of pencils to the United States from Great Britain, American manufacturers had to make pencil leads from inferior graphite, which broke easily. HTMK1/c"&nBPj-EbZ{yov&)o_m*~5(Az&L+ =/iS)*ECu<2OP(/1`Q)lQ9Gv;Ik`yQ\c.|[YTG+wJN*i`a A v:.|EzQw$v*^S9t@(riaBb(qG)d|D;[@0R[MvL+%:R6p>UqNpz^ _a+.tmE7tC? Be Example of chemical compound pure substance salt. Since this writing material behaved similar to metallic lead, but had a darker color, people began calling it "black lead". 0000186651 00000 n 183 0 obj Identify each substance as a compound, an element, a heterogeneous mixture, or a homogeneous mixture (solution). They have their own box on the periodic table. Instead, it has a spring loaded mechanism that holds the point stationary. HRMK17N>6GHW[XY/--ta^ Homogeneous mixtures are mixtures of two or more compounds (or elements) that are, Heterogeneous mixtures are mixtures of two or more compounds (or elements) that. Is ITALIAN DRESSING a heterogeneous mixture, homogeneous mixture, compound, or element? 3.4: Classifying Matter According to Its Composition is shared under a CK-12 license and was authored, remixed, and/or curated by Marisa Alviar-Agnew & Henry Agnew. Is THE ABILITY TO RUST a physical or chemical property? According to the book The Pencil by Henry Petroski, the graphite pencil was first developed and popularized in the 1600's. The ability of a substance to react with oxygen and moisture to create a reddish, flaky coating. 153 0 obj What do the parents perceive as their role to the Day Care worker? Properties of matter that may be measured by performing a chemical reaction. WebGraphite (/ r f a t /) is a crystalline form of the element carbon.It consists of stacked layers of graphene.Graphite occurs naturally and is the most stable form of carbon under standard conditions.Synthetic and natural graphite are consumed on large scale (300 kton/year, in 1989) for uses in pencils, lubricants, and electrodes.Under high pressures Chemistry was in its infancy and the substance was thought to be a form of lead. 78,185. Does this mean that all carbon atoms in a straight-chain hydrocarbon actually have a linear arrangement? Mixtures are physical combinations of two or more elements and/or compounds. Is INK an element, compound, mixture, or none? The amount of salt in the salt water can vary from one sample to another. Water is also a pure substance. 139 0 obj a sample of 508.4 grams of copper completely reacted with oxygen to form 572.4 grams of a copper oxide production. Is HARDNESS a physical or chemical property? Is DUCTILITY an intensive or extensive property? paint is a mixture substance. endobj 0000008621 00000 n What does this mean emulate what you respect in your friends? xref A lead pencil has an eraser, but a mechanical pencil does not. Are pencils pure grapite? But both an elements and compounds are pure substances. Mixtures are physical combinations of two or more elements and/or compounds. An impure substance produces two or more spots. 0000003870 00000 n Its proved a win-win for creative expressionists ever since! Is A PAIL OF GARBAGE an element, compound, mixture, or none? ), a mixture of iron metal filings and sulfur powder (Both iron and sulfur are elements.). Pure substances are composed of a single element or compounds. Salt easily dissolves in water, but salt water cannot be classified as a substance because its composition can vary. endobj The core of a pencil does not contain lead and never has. 684kid. Otherwise, click the red Don't know box. Pure elements. <> (H2SO4), Is BISMUTH an element, compound, mixture, or none? The 10th gen iPad has a usb-c port and the Apple Pencil has a lightning plug. Matter can be classified into two broad categories: pure substances and mixtures.
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