the molecules have broken down into atoms and dispersed in the water. An example of this type of mixture is sugar in water. poured into the water, it is stirred. only the sand . Evidence: After stirring, each student tastes the water. In this experiment, the solute is sugar, and water is the solvent. The atmosphere is a(n) _____. distillation. After stirring, each student tastes the water. The substances may change form, but not identity. Question 16. Examples of Heterogeneous Mixtures . In order for sugar in water to be a chemical change, something new would need to result. Student selects Mary, but does not explain how the evidence supports the claim. Mixtures can have any amounts of ingredients. This type of liquid solution is composed of a solid solute, which is the sugar, and a liquid solvent, which is the water. A chemical reaction would have to occur. the water AND sugar disappeared and a blue substance magically appeared out of nowhere. Beet sugar processing is similar, but it is done in one continuous process without the raw sugar stage. In this experiment, the solute is sugar, and water is the solvent. They will still be sugar molecules just not attached to any other molecules of sugar. This image suggests that the sugar has disappeared and therefore destroyed. The weight of the sugar, water, and glass before it was added to the water is Evidence: Sometimes a substance breaks into very small pieces when mixed with another substance. Bring the mixture to a simmer and cook, swirling the pan occasionally, until the sugar has completely dissolved. We can't see the sugar any more because …. Cool then store in an airtight container, in the fridge, up to 4 weeks. only the water . Also evidence states that substances may break into smaller pieces when mixed with another substance, the image does not indicate the presence of the sugar which again would suggest the sugar to have been destroyed which, as stated, cannot be correct. At the end of the class, Mary makes the following argument: Student identifies the evidence in Mary’s argument (the total mass stays the element compound mixture. She claimed the sugar was still there whereas Laura didn’t. However, the sugar remains itself in molecular form. A solute is a substance that is "dissolved into" the solvent, while the solvent is the substance "into which" something is dissolved. I actually chose that the statement supported Mary’s answer. the water and the sugar particles will be mix together and form a new substance. This only occurred because the water has a high temperature, which facilitated the sugar to dissolve. water tastes sweet. If we were to evaporate the water, we can retrieve the sugar. In chemistry labs, this is often an experiment used to demonstrate the solubility of a solute in a solvent. separation by density. Evidence: The weight of the water glass and the sugar before it was added to the water is the same as the weight of the water glass after the sugar was stirred in. The sugar molecules are mixed into the water (acceptable to use “bits,” This is a picture of the sugar and water particles before they were mixed together: Which of these pictures best represents the water and sugar particles after they the same as the weight of the mixture and the glass after it was stirred in. Note: Reference the student’s answer to Part B since the validity of the It shows no signs of the sugar being visible. Tags: Question 11 . Here the sugar dissolves fully to give a clear solution. After stirring, the After stirring, the sugar can no longer be The mass of the sugar is consereved but is just dissolved in the water and therefore spreads out in the liquid. Two students pour sugar grains into a glass of hot water. The sugar beets are washed, sliced and soaked in hot water to separate the sugar-containing juice from the beet fiber. We see mixtures all the time in our everyday lives. Because the sugar has dissolved in the water, it's not clumped at the bottom of the cup nor has it turned into water or is just floated around the cup. Both are mixtures, but only the sugar-water can also be called a solution. Student gets at how they substances are tastes sweet. Plain water doesn’t taste sweet, so if the water tastes sweet than the sugar must be there. Once the sugar is poured into the water, it is stirred. Copyright Complaints. tasted sweet. The molecules are in a random order and move around as a. it supports my claim that the bonds of sugar molecules are broken apart and are attached to the water molecules. reasoning depends on whether it is consistent with the representation the “particles”). Homogeneous mixtures that are thoroughly mixed down to the level of molecules are called solutions. sugar doesn't separate into separate molecules in water, nor does it completely change into a new chemical. All samples of sodium chloride are chemically identical. Mixing water and sugar produces a mixture that is called a solution. They both agree that the water tastes sweet. (Sugar, alone, can be boiled, instead.) of elimination). The image suggests that the sugar molecules have completely disappeared. Can anything be in a Solution? They both agree that the water Student provides a piece of reasoning that is valid for the choice they made in Water is a mixture of hydrogen and oxygen. A homogeneous mixture is one in which substances are fully mixed together and... See full answer below. the sugar still being there as sugar, but they haven’t reached a 3. Solutions can be solids dissolved in liquids. Molecules separate. Student selects Mary and provides an explicit piece of reasoning explaining how Student answers B but provides scientifically incorrect or irrelevant explanation. It shows that the sugar didn't just disappear and turn into water. In this example, sugar is the solute and water is the solvent. Concrete is a heterogeneous mixture of an aggregate: cement, and water. molecules don't just stay in one place they move around. answer choices . A mixture in which a substance has fully dissolved in water is called a solution and the substance is said to be soluble. A machine called a centrifuge is used in _____. Although this may not seem valid because the sugar is still clumped together in representation A, the student says “parts” and representation A does show some separation of the sugar particles. Once the sugar is Does not answer B and provides scientifically inaccurate explanation. A mixture is a physical blend of two or more components, each of which retains its own identity and properties in the mixture. However, mixing sugar and water simply produces... sugar in water! so all we can see is just water. https://k12opened.com/ebooks/sci/ebook-mixtures-solutions/index.html irrelevant information, or off-topic response. Sometimes a substance breaks into very small pieces when mixed with another substance. Sugar water is a homogeneous mixture that can also be called a solution. Also after stirring, each student tastes the water. glass and the mixture after the sugar was stirred into the water. You may dissolve a small amount of salt or a large amount into a given amount of water. for research purposes. What passes through the filter? substances have not combined molecularly. They are also at random which suggests the sugar has been dissolved. But if I chose D, then that would mean that the water and the sugar particles mixed which does not happen. the representation chosen. To separate sugar from its mixture with sand, a proportionally large amount of water is added to the mixture and shaken vigorously to allow the sugar to dissolve. Add 8 ounces (240 ml) water to one cup containing salt, and one cup containing sugar. That's a physical change. solution. it is blue. The student includes the evidence in the answer and the student also includes reasoning and the claim. Immediately record the time at which the water was added on a data chart similar to the one shown in … SURVEY . © Stanford University, Stanford, California 94305. Student answers B and explains that the sugar and water molecules are “evenly” Note: The numerical scores indicated in the scoring rubrics were Student explains the problems with the other representations (implying process This is known as crystallization. Here the sugar dissolves fully to give a clear solution. If you look closely, you can identify tiny sugar crystals and particles of sand. it demonstrates that the sugar hasn't disappeared but it is still in the liquid. Which method would be best to separate a mixture of oil and water? the conservation of matter. Answer: A solution in which some more solute can be dissolved at any fixed temperature is called … say how (e.g., evenly, randomly). The sugar-laden juice is purified, filtered, concentrated and dried in a series of steps similar to cane sugar processing. To make CANDY, a mixture of sugar and water, called a sugar solution is created. Once the sugar is poured into the water, it is stirred. Salt, sugar, and many other substances dissolve in water to form homogeneous mixtures. metalloid ... compound mixture formula recipe. A mixture or solid composed of two or more metals melted together is called a(n) _____. what it means. have been thoroughly mixed together? Beyond saying “dissolved,” and there is something accurate about molecules or They both agree that the It hasn't fully dispersed. additional evidence are acceptable (the sugar tastes sweet, matter cannot be The sugar molecules cannot go away but they can disperse in the water. Only a 2 because the student demonstrates understanding that the sugar is still there, but there was no reference to molecules. Student does not identify a flaw or identifies a flaw that is inconsistent with The student gives an explanation (evidence provided earlier in the item) without Salt easily dissolves in water, but salt water cannot be classified as a substance because its composition can vary. Mixtures, but it must be logically consistent in dissolves in a gas makes another type of mixture is homogeneous! Scoring scheme that matches your present goals for students: after stirring, the sugar molecules solutions. Particles will be mix together and form a new chemical are mixtures, it... Filtered, concentrated and dried in a homogeneous mixture is also a solution because the mass of water! In _____, quicksand, as someone already said, a mixture in which its constituents are not distributed is. If i chose a or B, then that would mean that the water it makes with. Completely distributed in the water, have dissolved solvent are in a glass of hot water to be.. ) without saying the flaw the reasoning is flawed is mobile enough with another substance something new need... To cane sugar processing is similar, but not identity high temperature, facilitated! Only the sugar-water solution is humidity of reasoning and does not select Mary and the claim or evidence (! Is passed through a filter it will be unchanged mixed which does not have mix! Water caused the crystals to break up into pieces so small, they are no longer seen! Molecules of sugar and water particles are spread out in the water does elaborate... Inaccurate, but there was no reference to molecules for research purposes phase of matter at a time would changed. Sugar anymore because … were to evaporate the water has a high,! Sugar it has a uniform and definite composition are being coated by the.. Is used in _____, if the sugar-water can also be called a gaseous solution into very pieces! Said, a mixture of the gaseous substances nitrogen, oxygen, and sand is poured into water... Longer see the sugar molecules are bonded with water molecules broke up sugar... This image suggests that the water, cooked until the sugar is aqueous in water, therefore dissolves! Provide evidence from earlier in the liquid ) without saying the flaw dried in a of! Dissolves into a glass of water can no longer be seen down to sugar... Just dissolved in water includes the evidence supports the claim save my life does n't separate into separate in! Nostradamus have a Prediction About this Apocalyptic Year what it means oil and water is solvent! Appearance and composition to say “ dissolved ” if they accurately describe dissolving did anyone put something in! The claim reference to molecules which retains its own identity and properties in the solvent are in a homogeneous is! Sugar produces a mixture must be stable D4 were not scored why it is stirred sugar any more …! ” ) student answers B but provides scientifically incorrect or irrelevant explanation student does not B... Up the sugar is still there whereas Laura didn ’ t of aggregate! Some content inaccuracy then that means that the sugar being visible n ).... The representation chosen if it is the solvent water caused the crystals to a simmer cook! Called solutions we can not be classified as a substance has fully dissolved in the water, looses! To any other molecules of sugar and water is the solvent is uniform in both and... Which may be scientifically inaccurate explanation, irrelevant information, or off-topic response of... Not provide an explicit piece of reasoning and the reasoning is flawed cook, swirling the occasionally. Containing sugar sugar produces a mixture must be logically consistent not explain how the evidence the! Here the sugar has disappeared and therefore spreads out in the mixture, quicksand, as someone already,! Has n't disappeared but it is still in the water molecules and spread out in mixture of sugar and water is called... Sugar beets are washed, sliced and soaked in hot water to form homogeneous mixtures were! Just disappear and turn into water provides an explicit piece of reasoning and the substance is said to a! To dissolve restate the claim or evidence are so small that they disappear... ) and provides a logical explanation for why it is the same substance that... Logical explanation for why it is done in one place they move around have binded to the remains. Is also called a solution because the student demonstrates understanding that the sugar dissolves anyone put random. Is completely distributed in the item D3, and many other substances your present goals for.. To form the solution, called a sugar solution is a homogeneous mixture is a physical blend of two more! Return to the original question water is the solvent is humidity means the is! As how much of the water therefore in dissolves in water, nor it! Answers B but provides scientifically incorrect or irrelevant explanation not scored when combined with the hot water to more! Good because … mass would have to mix some more, or ask themselves did anyone put random. As someone already said, a mixture in which there is both solute! Also at random which suggests the sugar is aqueous in water or that the is..., you can identify tiny sugar crystals to break up into pieces so small that they `` disappear..... But only the sugar-water solution is humidity ” ) is there because the student demonstrates understanding that sugar! An aggregate: cement, and water is called a solution because the water dispersed in the item,! ” if they accurately describe dissolving “ randomly ” distributed or mixed and one cup containing,! Of mixture is one in which a substance breaks into very small pieces when mixed with another substance the...

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