-maintenance of heart and blood vessels, muscle \\ 2. Mixture Lemonade has a definite volume but takes the shape of its container. c. bronze. Elements cannot be broken down into simpler substances. For example: Homogeneous mixtures include single-phase substances (the same state of matter), such as coffee with creamer (both liquid) or sterling silver (made with silver and copper). 3. orbitals in the 6s sublevel Sugar and sand form a heterogeneous mixture. 3. the alkali metal in Period 3 Explain. The components appear as two separate regions, Classify each of the following as a pure substance (element or compound) or a mixture (homogeneous or heterogeneous): 2. Water on the street turns to ice during a cold wintry night. liquid 1. calories to heat 8.5 g of water from 15 C to 36 C What do homogeneous and heterogeneous have in common? Another key component of homogenous mixtures vs. heterogeneous mixtures is what phase each substance is in. -valence electrons occupy the s and p sublevels with the highest principal quantum number n. of an atom is determined by the distance of the valence electrons from the nucleus. for a particular isotope that indicates the mass number in the upper left corner and the atomic number in the lower left corner. Note that chemical names consist of words that resemble elemental names, and chemical formulas contain elemental symbols. a) Most atoms have more electrons than protons Group 2A (2), Period 4 A chocolate chip would be considered a homogeneous mixture, assuming that there werent swirls or other materials mixed into it. Provide three examples of each. Group 8A (18) 8. strontium, 1. For example, "Hg" is the elemental symbol for the element named "mercury," which contains neither an "h" nor an "g" in its spelling! ;:fercB{\'\ q1074~c<>)FYldeT. 5. Pure Substance 7. lead 7. Indicate the number of each in the following: Explain the difference between a homogeneous mixture and a heterogeneous mixture. The type of mixture chocolate is depends on the chocolate. 335 K carries a negative charge = electron, Decide if it is a proton, neutron, or electron described in each of the following: Why? 3. electron We are obsessed with the outdoors, and work constantly to bring you the information you need to enjoy the rocks and minerals you've added to your collection. ignites spontaneously in air when finely divided= chemical, Describe each property of the element zirconium as physical or chemical Explore the particle size of heterogeneous mixtures and whether they can be separated. What is that temperature in degrees Fahrenheit? At a temperature called the melting point (mp)? These individual components are uniformly blended with one another, so every"sample"taken when drinking a glass of wine would have the same color, aroma, and flavor. 3. 3. 3. oxygen gas (O2) Explain. If it is a mixture, classify it as homogeneous or Question: Classifying Matter 1) Classify each mixture as homogeneous or heterogeneous. a. element b. mixture c. homogeneous mixture d. heterogeneous mixture, Explain the differences between the following. 3. is found outside the nucleus Period 2 2. 2. 4. an element that is a gas at room temperature 1. Ba Element. S There is definitely more than one building block, which disqualifies it. No, for the same reasons above. As was the case with the physical properties of chemistry that were defined in the previous chapter, specific rules must be followed when writing elemental symbols. Mixtures can be either homogeneous or heterogeneous': a mixture in which constituents are distributed uniformly is called homogeneous, such as salt in water, otherwise it is called heterogeneous, such as sand in water. Is coffee classified as an element, a compound, a homogeneous mixture, or a heterogeneous mixture? The heat is calculated for each step separately and then added together to find the total energy. 1. baking soda (NaHCO3) Explain the difference between homogeneous catalysis and heterogeneous catalysis. element compound heterogeneous mixture homogeneous mixture 2 See answers Advertisement Advertisement madison120200 madison120200 Heterogeneous mixture because you can see the things that make up the cookie Advertisement Nitrogen Identify the following as elements, compounds, or mixtures: Identify the following as physical or chemical changes: Classify the following as homogeneous or heterogeneous: A ball falls off a cliff. 5. Physical What is the meaning of homogeneous and heterogeneous? the composition is uniform throughout the sample.We cannot see the individual components, which appear as one state. Part 1 1. Mixtures can be separated by the differences in the physical properties of their components. -particles that are close together but mobile A few simple examples will be mentioned here. Determine whether each of the following is homogeneous or. 7. tin A bar of chocolate would be considered a mixture. is found in the nucleus = proton and neutron . Explain. O. Explain. 4. Chocolate chip cookies are a heterogeneous mixture. Therefore, water contains two hydrogens for every one oxygen. Chocolate chip cookies are a heterogeneous mixture. Food is digested, melts at 1852C = physical copyright 2003-2023 Homework.Study.com. Examples of heterogeneous mixtures include sand, oil and water, and chicken noodle soup. Answer a: Heterogeneous Give two examples of heterogeneous mixtures. Which of the following is a heterogeneous mixture? N Use examples if necessary. 4. What is this temperature on a Celsius thermometer? 4. zinc (Zn) Wet clothes dry on a clothesline. Mixture components can be solids, liquids, or gasses that retain their. Is chocolate chip ice cream an example of a homogeneous or heterogeneous mixture? CVA Environmental Science Module 2 - The Interdisciplinary Nature of Environmental Science A2.02.1 Fundamentals of Matter and Chemistry Scavenger Hunt View the video at this link - CVA Environmental Science Classifica4on of Ma7er Direc4ons: Part 1: A9er watching the video, fill in the missing words in the paragraphs. a. Pure Substance d) electrons orbit the nucleus 4. Legal. What is difference between homogeneous and heterogeneous mixture? Elements 2. 3. Helium, which is used to inflate balloons, is also an element. Salt and pepper form a heterogeneous mixture. . You can get bites without any chocolate. Ice crystals form on a package of frozen corn. Explain the difference between an element and a compound. mass number - atomic number = number of neutrons, What do you know about the subatomic particles from the following? d) 4 A peanut butter cookie is a decent example of what might be considered a homogeneous mixture, assuming you dont add nuts to it. The vocabulary discussed in this section is summarized below in Figure \(\PageIndex{1}\). Chlorine Is gold (Au) classified as a mixture or a pure substance? a proton and an electron = no What is it called when a substance cannot be broken down into simpler substances? As no additional capital letters are present, this chemical consists of only one elemental symbol and, therefore, is a single element (cobalt). Question: Classify each of the following mixtures as homogeneous or heterogeneous: a. nonfat milk b. chocolate-chip ice cream C. gasoline d. peanut butter sandwich e. cranberry juice 2. The chemical formula for water contains an "H," which is the elemental symbol for "hydrogen," and an "O," which is the elemental symbol for "oxygen." 3p sublevel Is cereal and milk a homogeneous mixture or a heterogeneous mixture? Is the energy needed to remove one electron from an atom in the gaseous (g) state. 4. Homogeneous . Group 4A (14), Period 2 What is the difference between the two. - Are tiny particles of matter. Explain the difference between a pure substance and a mixture. 2. joules to vaporize 5.00 g of water Your friend who is visiting from Canada just took her temperature. -particles that move slowly, -does not have a definite shape or volume What is the name given to the homogeneous substance that has the same properties of its components? Concrete is a heterogeneous mixture of an aggregate: cement, and water. a) all matter is made up of small pieces called atoms -Ca, P, K, Cl, S, Na, and Mgare Give three examples of homogeneous and heterogeneous mixtures, respectively. "Dihydrogen monoxide" is the chemical name for the compound commonly known as "water." Which statement describes homogeneous mixtures? 5. Classify a substanceas an element, a compound, a homogeneous mixture, or a heterogeneous mixture. What is an example of a Heterogeneous mixture? 3. a shiny element Sugar and sand form a heterogeneous mixture. Homogeneous mixtures can be solid, liquid, or gas. 5d sublevel. 5400 cal absorbed chemical changes. You aren't able to separate the ingredients in the sauce or the dough. What did Rutherford determine about the structure of the atom from his gold-foil experiment? What best describes homogeneous mixture . Pb ). It is not uniform, and this is why a chocolate chip cookie is considered a heterogeneous mixture. A pure substance is a form of matter that has a definite composition. Classifying Matter By Composition - Video. Give some examples. carbon Chocolate chip cookies are a heterogeneous mixture. How much heat, in kilojoules, is absorbed to melt the ice and raise the temperature of the water to body temperature, 37.0 C? c) Mg . -For water, 540 cal (2260 J) is needed to convert 1 g of water to vapor at 100 C. Is also the quantity of heat that must be removed to freeze exactly 1 g of water at its freezing point (0 C). 2. -regulation of cellular metabolism. 5. Explain. After a session of using weights, he has a sore arm. - To determine the heat needed to boil a sample of water, the mass, in grams, is multiplied by the heat of vaporization. 4300 kcal released Sr, Write the symbols for the following elements: What is a homogeneous liquid that is mixed thoroughly? e) 5, A) all matter is made up of small pieces called atoms, Which IS a part of Dalton's Atomic Theory? Concrete is a heterogeneous mixture of an aggregate: cement, and water. Is isopropyl alcohol a heterogeneous or homogeneous mixture? Classify each of the following as a pure substance or a mixture: Classify each of the following as a compound or element: homogenized milk = Homogenous Is a taco an example of an element, compound, homogeneous mixture/solution, or heterogeneous mixture? Is this a homogeneous or heterogeneous mixture? Compounds cannot be classified in this way. Each portion of the heterogeneous mixture may have a different ratio of the components in it. is an element that loses valence electrons easily This problem has been solved! makes up 55 to 60% of our body mass. b) Al Hey there! mass number The chocolate. -particles that are far apart. arrow_forward Classify the following as solution or heterogeneous mixture. Is taking place as water particles with sufficient energy escape from the liquid surface and enter the gas phase. Na Explain. again to identify something as homogeneous or heterogeneous, you need to know the definitions of homogeneous and heterogeneous and some properties of that substance. 4. titanium d. wood. Salt water is an example of a homogeneous mixture, as it contains two distinctive chemicals, a "salt," which is most likely sodium chloride, NaCl, and water,H2O. Potential 6. bromine 3. metal Chemical There are two main categories of mixtures: homogeneous mixtures and heterogeneous mixtures. While water contains two hydrogens for every one oxygen, hydrogen peroxide (H2O2) contains a two-to-two ratio of hydrogen to oxygen. the components do not have a uniform composition throughout the sample. While a complete elemental name can be writtenwith its first letter being either capitalized or lower-case, the first letter in an elemental symbolmustbe capitalized, and any additional lettersmustbe lower-case. Science Chemistry Chemistry questions and answers Classify each of the following as an element compound, homogeneous mixture, or heterogeneous mixture. 7. metalloid Pure Substance 4. Takes place, the original substance is converted into one or more new substances, which have new physical and chemical properties. Classify the following as a homogeneous mixture or heterogeneous mixture: A tablespoon of instant ice tea dissolved in water. mass number - atomic number, Carbon 6p, 6e of body fluids. 2. nonmetal 1. Selenium fluorine On the Celsius scale, her temperature would be 37.7 C, a mild fever. Classify each of the following as a pure substance (element or compound) or a mixture (homogeneous or heterogeneous): Nitrox, a combination of oxygen and nitrogen used to fill scuba tanks 4. If you took one bite of a cookie, the bite should be the same as all the rest of the bites of the cookies. 2600 J - Density: 2.1g/mL A mixture is formed by combining two or more materials. Give examples of an element, a compound, a heterogeneous mixture, and a homogeneous mixture. 2. number of neutrons in an atom I The breathing mixture in a scuba tank has no definite volume or shape. Heterogeneous Mixtures: When two or more substances and mechanically mixed, they form a type of mixture whose. d) Electrons are much lighter than neutrons, Which of the following elements is an alkaline earth metal? Concrete is a heterogeneous mixture of an aggregate: cement, and water. When she reads 99.8 F, she becomes concerned that she is quite ill. How would you explain this temperature to your friend? <> Se - 80. cal (334 J) of heat is needed to melt exactly 1 g of ice at its melting point (0 C). Calculate the energy required to keep the light bulb burning for 3.0 h in each of the following energy units: a proton and an electron . -only movement is to vibrate slowly in fixed positions, -has a definite volume, but not a definite shape. This same amount of heat is released when 1 g of water vapor (gas) changes to liquid at 100 C. Explain. - Gain electrons during a chemical change, - They are better conductors of heat and electricity than the nonmetals, but not as good as the metals. a) the number of electrons Mass # Our experts can answer your tough homework and study questions. "Aluminum," "helium," and "carbon" are all examples ofelemental names. Video Answer Solved by verified expert David C. Numerade Educator View Text Answer Textbook Answer Halo-halo44. You may get different numbers of chocolate chips with each bite. - Are shiny solids Deposition, Calculate the heat change at 0 C for each of the following, and indicate whether heat was absorbed/released: c) the number of neutrons, Which of the following has a higher ionization energy? 2. If a mixture, indicate whether it is homogeneous or heterogeneous: (a) rice pudding, (b) seawater, (c) magnesium, (d) crushed ice. - Of two or more different elements combine to form Bubbles are carbon dioxide. Cd The three phases or states of matter are gas, liquid, and solid. 4 0 obj 14 - Electric Stimulation. at the top of a ski hill about to come down = potential energy, Indicate whether each item describes potential or kinetic energy: If no subscript is written, an unwritten "1" is understood, as was the case for several of the numerical quantities that were discussed in the previous chapter. 4. 1. oxygen 62C=K is also a pure substance, but it consists of atoms of two or more elements always chemically combined in the same proportion. Define the following terms: pure substance, element, compound, mixture, homogeneous mixture, and heterogeneous mixture. The mixture is homogeneous because if several samples were taken, each sample would contain both salt and water in the same relative ratio, making every sample "equally salty. 5. -They tend to lose electrons when they undergo Whole-number subscripts indicate how many of the previouselement are present in the compound. 18.5 C d) Rb, How many electrons does an atom of He have? - Metals can be shaped into wires (ductile) or hammered into a flat sheet (malleable). How many kilojoules did the swimmer expend? (Or Mixture, Solution, or Element? 3p sublevel 6. barium Key Takeaways: Mixture. Chocolate chip cookies are . Kinetic Explain. In a sauna, 122 g of water is converted to steam at 100 C. ; Heterogeneous mixtures include multi-phase substances (different states of matter), such as sand and . 2. 2 0 obj Answer c: Compound -The substance is melting, changing from a solid to a liquid. 31 Cents (a quarter, a nickel, and a penny), Sucrose,which is commonly-known as "table sugar" (C. 1. joules needed to melt 50.0 g of ice at 0 C and to warm the liquid to 65.0 C Homogeneous and Heterogeneous Mixtures The physical combination of two or more components is called a mixture. What makes the following two mixtures different? Which of the following are pure substances? Is a chocolate chip cookie an example of a heterogeneous or homogenous mixture? blood. -same shape and volume as container How do the properties of a heterogeneous mixture differ from those of a solution? Wine41. Much like elements, each compound has a correspondingchemical name, which can be abbreviated using achemical formula. What are the examples of homogeneous? 1. Answer c: Homogeneous Would you use the atomic number, mass number, or both to determine each of the following? 4. Copper has the lowest specific heat of the samples and will reach the highest temperature. 3. Compound Since the "l" is lower-case, it must be the second letter of that second elemental symbol, Cl (chlorine). Concrete is a heterogeneous mixture of an aggregate: cement, and water. 2. The 1s, 2s, and 3s orbitals are all spherical, but they increase in volume because the electron is most likely to be found farther from the nucleus for higher energy levels. What is a heterogeneous mixture quizlet? On the other hand, homogenous is a mixture too, but the elements are not. 2. Mass # A mixture is a blend of two or more elements or compounds, which have theirown identities and properties. Gasoline burns in air. 1. Explain. - Melting point: 962 Celsius Element atomic number 4. Chocolate chip cookie is an example of a heterogeneous mixture because it is made up of different materials and can be easily distinguished. How would you classify the following material? Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. 4. c) Mg Explain. What is the difference between homogeneous and heterogeneous mixtures give examples? How can you tell just by looking if a mixture is most likely homogeneous or heterogeneous? A gold ingot is hammered to form gold leaf. 4. tea with ice and lemon slices, 1. A chocolate chip cookie is an example of a (2 points) a homogeneous mixture b heterogeneous mixture c suspension d colloid 2 See answers Advertisement Advertisement jgcarlso jgcarlso Answer: I think it is heterogeneous mixture. Show that the nuclear density is the same for all nuclei. A heterogenous mixture is that mixture in which the composition is not uniform throughout . Chocolate chip cookies 5200 cal absorbed Chemical Identify each of the following changes of state as melting, freezing, sublimation, or deposition: Salt and pepper form a heterogeneous mixture. Fe Ice cubes in cola form a heterogeneous mixture. -Condensation occurs at the same temperature as boiling. Atomic #. which are the electrons in the outermost energy level Chocolate chip cookies and soda are examples of heterogeneous mixture. . How is a chocolate chip cookie a good example of a heterogeneous mixture? Explain. Carbon is an element that is essential to life on earth, as it is found in all living systems. -the formation of bones and teeth. Se Is sand a pure substance or a mixture? Physical Carbon Garlic is chopped into small pieces. Pure substances can be categorized as either elements or compounds. Gold is hammered into thin sheets 3. a car speeding down the freeway= kinetic energy is found in the larger part of the atom Homogeneous mixtures are sources of water, saline solution, some alloys, and bitumen. 2. Accept any reasonable answer. Cake is a mixture of ingredients like eggs, sugar, flour and more. - electrons that occupy a large, empty space around the <>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> The alkaline earth metals are shiny metals like those in Group 1A (1), but they are not as reactive. 5. nonmetal -A liquid changes to a solid at the freezing point (fp), which is the same temperature as its melting point: 0 C. If you had chocolate that had added extras that were not consistent and uniform throughout, then it would be a heterogeneous mixture. the horizontal line at the boiling point is longer than the horizontal line at the melting point. 2. Co. - soft, shiny metals 1. Examples of homogeneous mixtures include air, saline solution, most alloys, and bitumen. Anelementconsists of only one type of atom and cannot be broken down into smaller pieces without changing its properties. 1. 3. A chocolate-chip cookie. S 1. The neon atoms in a lighting display do not interact with each other. The chemical formula for this incredibly important substance is "H2O". Heterogeneous mixture. Give some examples. -Metals are good conductors of heat and electricity. have a good day. Is calamine lotion an example of a heterogeneous or homogenous mixture? What are homogenous and heterogeneous substances? Mixtures of Pure Substances. Cl coffee (with milk) a. a heterogeneous mixture b. a solution c. a suspension d. an element. Indicate the maximum number of electrons in the following: In a heterogeneous mixture the substances are not evenly distributed (chocolate chip cookies, pizza, rocks) Cu The abbreviation "Hg" is derived from the Greek word "hydrargyrum,"which means "liquid silver"- a phrase that accurately represents the appearance of mercury! Explain. Chocolate chip cookies are a heterogeneous mixture. Freezing 3. calcium Condensation 3. fruit salad Its state, size, or appearance will change, but its composition remains the same. 2. joules lost when 25 g of water cools from 86 C to 61 C 3. kilocalories to condense 8.0 kg of steam How can you tell that you have one or the other? fluorine 9p, 9e 4. ends with neon, 1. 155C to F . a car speeding down the freeway 1. calcium e. natural gas. 2. the noble gas in Period 1 a. air b. orange juice with pulp c. raw milk d. marble. It does not store any personal data. In the United States, we still use the Fahrenheit temperature scale. Ahomogeneous mixturehas a uniform composition, meaning that if several samples are taken, each would contain the same chemicals in approximately the same ratio. Vinegar40. 8. gold, Write the name for the symbol of each of the following elements found in the body: A homogeneous solution tends to be identical, no matter how you sample it. Co, 1. Sugar and sand form a heterogeneous mixture. - Density: 6.7g/mL Is wine classified as an element, a compound, a homogeneous mixture, or a heterogeneous mixture? Explanation:Since the "o" is lower-case, it must be the second letter of the elemental symbol beginning with a capital "C". Indicate whether each of the following describes a gas, a liquid, or a solid: Explain. A child who fell through the ice on a lake has hypothermia with a core temperature of 32 C. 2. sublevels in the n=1 energy level 2. tea There is a maximum of 32 electrons in the n=4 energy level. Nearly everything within the known universe, from water, to a fish, to the planets, is composed of matter. The particles within a liquid have enough energy to overcome their attractive forces and become a gas. A=(11203010). The n=3 energy level consists of one 3s, three 3p, and five 3d orbitals. There is one orbital in the 6s sublevel. What is the difference between a homogenous and a heterogeneous mixture? 96% of our body mass. is determined by the position of an object or by the chemical composition of a substance. Explain. f. styrofoam. 3. contains the alkali metals Since two elements are present, this is a compound (carbon monoxide). sulfur, Al 13p, 14n, 13e Still curious about mixtures, compounds, and solutions, or whether common materials familiar to you like iron, ammonia, soil, gold, motor oil, oxygen, brick, grape juice, beer, diamond, bleach, urine, and limestone are mixtures or pure substances? True or False: When heat is added to a solid, the particles move faster. two or more different substances are physically mixed, but not chemically combined. is anything that has mass and occupies space. (Hint: The solution will require three energy calculations.). 3. 3. number of particles in the nucleus Gas particles change directly to a solid. Is a carbonated beverage an example of a heterogeneous or homogenous mixture? Acompoundor molecule must contain two or more elements that are combined in a specific ratio. Explain. Explanation: Wines and other liquors contain ethanol, which is the chemical commonly-known as "drinking alcohol," water, and different flavorings. (a) baby oil (b) chocolate chip cookie (c) water and gasoline (d) wine Question Classify each mixture as homogeneous or heterogeneous. - are extremely tiny particles that make up each type of matter. In the light of above definitions: Explain the term heterogeneous nucleation. When oil and water are combined, they do not mix evenly, but instead form two separate layers. A mixture is a material which contains more than one substance. . two protons What is this change of state? chocolate chip ice cream . C for a substance is defined as the amount of heat needed to raise the temperature of exactly 1 g of a substance by exactly 1 C. A heterogeneous mixture is : made of different substances that remain physically separate (General Chemistry Online). A homogeneous mixture is a mixture in which the composition is uniform throughout the mixture. 3. endobj 4. will explode in the presence of hydrogen at the top of a ski hill about to come down, Which of the following statements about electrons are false? 3. 11300 J absorbed 2. 4. Is baking soda (NaHCO3) classified as a mixture or a pure substance? has a mass about the same as a proton Is blood classified as an element, a compound, a homogeneous mixture, or a heterogeneous mixture? 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. A heterogeneous mixture is a type of mixture wherein the individual components may still be identified. - Density: 10.5g/mL Some problems require a combination of steps that include a temperature change as well as a change of state, how would you calculate to get an answer? (a) baby oil (b) chocolate chip cookie (c) water and gasoline (d) wine Classify each mixture as homogeneous or heterogeneous. gas, Calculate the heat change at 100 C for each of the following, and indicate whether heat was absorbed/released: Milk left in a warm room turns sour, 1. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. Explain. 2. has a 1+ charge - Elements are pure substances from which all other things are built. an electron and a neutron = no, Which of the following pairs of particles have the same charges? Classify each of the following pure substances as an element or a compound. 4. 4d sublevel. 3. has a pale, yellow color stream Charles has increased his activity by doing more exercise. In a homogenous mixture all the substances are evenly distributed throughout the mixture (salt water, air, blood). 1. A) The components of a mixture do not have the same properties individually as they do when mixed. Classify each of the following as a pure substance (element or compound) or a mixture (homogeneous or heterogeneous): 3600 J, 850 cal. Every spoonful of the cereal is different; it will contain a different amount of certain oat and marshmallow shapes. Chocolate chip cookies are a heterogeneous mixture. Chocolate is a material made up of multiple substances which do not become chemically bonded to each other. Answer and Explanation: A homogeneous mixture is the one which has the same uniform appearance and composition while heterogeneous mixture is the one which has visibly different substances and they are really unmixed. Evaporation True or False: The faster the particles move, the greater the heat or thermal energy of the substance? -On the periodic table, the atomic mass is the number including decimal places that is given below the symbol of each element, To calculate the atomic mass of an element, we need to know the percentage abundance and the mass of each isotope, which must be determined experimentally, Completely understand image 4.9 from chapter 4.6, Indicate the type and number of orbitals in each of the following energy levels or sublevels: A sandwich is a heterogeneous mixture. 6. nonmetal 3. lost when 15.0 g of ethanol, C2H6O, cools from 60.5 C to 42.0C They have the same appearance and . The particles on the surface of a solid change directly to a gas without going through the liquid state. The first step to answering this question is to understand what a pure substance is, scientifically and chemically. b. 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