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Standard:Chemical Reactions 9.3 Classify common substances as elements or compounds based on their symbols or formulasChemical Reactions 9.4 Differentiate between a mixture and a compound. Student Friendly Language: I can… classify substances as mixtures, compounds, and elements. Elements: Elements are pure substances. What this mean is that they are the most basic form of any substance: they cannot be broken down any further. All elements can be found on the periodic table by themselves. When looking at the chemical formula, all elements have one capital letter, which represents one element. Examples: O2, Na, K, Au, Ag Compounds: Compounds are substances that are two or more elements chemically bonded together. The only way to separate a compound is through a chemical reaction. When looking at a chemical formula, compounds have two or more capital letters, which represent two or more elements bonded together. Examples: H2O (water), NaCl (salt), sugar, Mixtures: Mixtures exist of more than one pure substance mixed together. The different substances in a mixture can be physical separated. Because mixtures are multiple substances, they do not have a chemical formula. Examples: Salt water, air, a salad, sand (salt, calcium carbonate, quartz), acids and bases.right320040Practice: Label the following as an element, mixture, or compoundCarbon (C)Ethanol (C2H6O)Carbon Dioxide (CO2)Baking Soda (NaHCO3)Salt (NaCl) Methane (CH4)Oxygen (O2)Nitrogen (N2)Air (atmosphere)Sulfur (S)Coca-ColaSulfate (SO4)Salt WaterHydrogen (H2)Kool-AidGlucose (C6H1206)Answer the following questions: Calcium Carbonate (CaCO3) is considered a compound because it is made up of two or more: MoleculesElementsGasesSolidsWhat type of matter can be separated by physical means?AtomElement Compound MixtureWhich of the following is a pure substance:Iron (Fe)Sand (Quartz + Calcium Carbonate + salts)Tap Water (H2O + Cl2 + Salts)Lemonade (sugar + H2O + Lemon)Samantha conducted an experiment. She had a jar filled with salt, iron filings, and sand. First, she separated the iron with a magnet. Next, she added water to dissolve the salt and filter the sand out. Finally, she boiled off the water and was left with only salt. Was the matter inside of the jar: A compound separated by physical meansA compound separated by chemical meansA mixture separate by chemical meansA mixture separated by physical meansTwo students work on different substances in a science lab. Student 1 has a mixture and student 2 has a compound. Both students will separate the parts of their substances. Which best describes a result of the separation process?Only the mixture will go through a chemical changeOnly the mixture will release heat when the parts are separatedEach part of the compound will gain mass during separation Each part of the new compound will have different chemical properties. Which combination of letters could be used as a chemical symbol for an element?BRChFeDyFeOWhich of the following is an example of a container that is filled with a pure substance rather than a mixture?A tire filled with airA jar filled with salt waterA balloon filled with heliumA glass filled with chocolate milkWhich of the following is a mixtureKool-AidSaltSugarHydrogen gasWhich formula represents a substance that is an elementCOCO2ONH3A student observes that the contents of a jar have many different substances, each with separate chemical and physical properties. The contents of the jar can be classified asAn elementA mixtureA solidA compoundWhich of the following is a compound?Salt waterSaltOxygenThe atmosphereWhich of the following about the separation of elements and compounds using chemical means is true?Elements and compounds cannot be changed into different substances.Elements can be changed into different substances but compounds cannot Elements cannot be changed into different substances and compounds can.Both elements and compounds can be changed into new substances.A pure substance can be made up ofElements and mixturesCompounds and elementsCompounds and mixturesCompounds, mixtures, and elementsA scientist is studying a substance. During the investigation, the scientist makes these observations about the substance.It is made up of two kinds of atomsIt cannot be changed into simpler substances except by chemical meansIt is a pure substance with a constant compositionWhat kind of substance is the scientist studying?An elementA compoundA mixtureA solutionAnswer Key: 9.3 and 9.4Carbon (C)ElementEthanol (C2H6O)CompoundCarbon Dioxide (CO2)CompoundBaking Soda (NaHCO3)CompoundSalt (NaCl) CompoundMethane (CH4)CompoundOxygen (O2)ElementNitrogen (N2)ElementAir (atmosphere)MixtureSulfur (S)ElementCoca-ColaMixtureSulfate (SO4)CompoundSalt WaterMixtureHydrogen (H2)ElementKool-AidMixtureGlucose (C6H1206)CompoundBDADDCCACBBCBB ................
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