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Davisson-Germer: Electron Diffraction. Double Wells and Covalent Bonds. Energy Forms and Changes.On Day 1 this multi-day lesson focuses on mixtures. Students develop and carry out a procedure for separating a mixture of sand, salt, iron filings, and marshmallows by physical means. On Day 2students develop ideas about factors that can increase the rate of dissolving. Finally, students work on "sounding like a scientist" as they write evidence based scientific paragraphs.
When students write about the relationship between factors that affect the rate of dissolving, students construct, use and present written argument supported by empirical evidence and scientific reasoning to support their claim SP7.
This also ties to the Science Practice Constructing Explanations, as students include qualitative and quantitative relationships between variables that predict s how factors affect the rate of dissolving SP6. Deciphering causal relationships, and the mechanisms by which they are mediated, is a major activity of science and engineering. Ask students, " What are you going to learn today? Students should respond with finding the answer to the Essential Question, " How do particles combine into new substances?
What evidence can show how the physical and chemical properties of the substances change? The unit plan as well as the notes sheet students have relating to identifying mixtures are included in the resource section.
I then let the students know that specifically we are going to look at mixtures over the next few days. I explain that in the past lesson, Marshmallow Moleculeswe looked at how mixtures are not combined chemically and can be separated by physical means. In addition, we read about how when solutes are dissolved in a solvent, a mixture is created.
Let students know that their focus today is to determine a procedure for separating a mixture by physical means and investigating factors that could affect the rate of dissolving of a solute in a solvent.
In a previous lesson, students identified criteria required for an effective procedure by sorting student writing samples from procedures written in a previous lab. Check out this Mini Lesson in the Density Test Tube Challenge Lab to get more information about where my students developed the criteria they are about to brainstorm.
In groups, have students brainstorm criteria they feel is important for effective procedures. While my students can brainstorm many of these criteria, I provide them with a procedure that a student wrote in the Density Test Tube Challenge Lab. This procedure is included in the resource section. Providing them with a student example helps students specifically identify and put words to criteria. Have each group share and create a class list on the board or on poster paper.
Students typically brainstorm the following:. Let students know that they will be writing a procedure to separate a mixture by physical means and that they should keep the brainstormed criteria from the mini lesson in mind when writing. Explain that each group will be given a mixture of sand, salt, iron filings, and mini marshmallows. Show students the mixture and let them know the tools that they have available to them.
Express to the students that each member of the group must be an active member of creating the procedures. Although you must only complete one procedure per group, each member of the group needs to provide input and ask questions as a part of the appropriate group discourse we have worked on all year.
When you bring me your procedure, I will be asking follow up questions and I will be asking random members of your group for insight into your work. John wrote that. I find that it is important to show the students the materials that they will have available to them.
Physically being able to see and touch the materials can spark better ideas for their uses. Below is a picture of a complete set lab station set up. One other important note is that it typically takes students 40 or more minutes to create an approved procedure.
I also find it is important to have the students note the size of the holes in the strainer and cup with holes. The key element to understand is that sand can travel through the strainer, but cannot pass through the cup with holes. I have plastic cups made with holes; however, you can simply poke holes in the bottom of a plastic cup if you do not have access to the type of cups I have.
In the following video, I look at a student procedure and note the important aspects of the procedure that I look for as well as the typical things that students have challenges with. Students then begin carrying out the procedure they wrote on the first day. Below are a series of pictures that takes you through the typical path students take to separate their mixtures.Please join StudyMode to read the full document.
Using separation techniques including magnetizing, evaporation, filtration, etc. There have been some errors regarding the isolation techniques and processes, however, the mass of salt at the end is substantial enough to conclude that results obtained are sufficient compared to the initial mass Introduction and Background The point of this experiment was to separate the different components present in a heterogeneous mixture. The expectations were to take the heterogeneous mixture of sand, salt, pebbles, iron filings, and water and use Procedure: The procedure for this lab report is as follows: 1.
Mixture is taken, and has to be measured in order to meet the requirements of g. The mass of the tray is measured and then the scale is zeroed out and the mixture is added to find out the mass of the original mixture. Next, find the mass of the mL beaker, zero out the scale, pour the mixture in, and weigh to find the mass. Find the mass of the mL beaker as well. In order to separate the iron from the mixturetake a bar magnet inside of a Ziploc bag, and swirl it through the mixture.
The iron will stick to the magnet, and lift the magnet out of the mixture. All iron in the mixture should be on the magnet. The iron taken out of the mixture is then measured to find the mass of the retrieved iron.
Next, the salt will be separated from the mixture. In order to do this, a ring stand must be set up with an iron ring and a glass funnel. Take a piece of filter paper and fold it as demonstrated by Mrs.
Montoney, and place it in the funnel.Limited press vinyl
Place a mL beaker under the funnel for the filtered water. Put the remaining Procedure: This experiment consisted of different processes to separate a mixture of solids into the four individual solids: sand, benzoic acid, iron fillings, and sodium chloride.
To remove the iron fillings from the mixture I used a magnet and scanned it across the entire mixture and the magnet forced picked up all the iron pieces. Then to separate the sand from the rest of the mixture I heated the mixture with water in a beaker and when I poured the heated liquid into a cup the sand remained in the bottom of the beaker.
Lastly to separate the benzoic acid and sodium chloride I used a filtration system and the sodium chloride and water drained into a cup while the benzoic acid remained on the filter.
Data: Item Mass grams Weighing Dish 0. Secondly, to determine the mass of each component by using the knowledge of separation techniques. The masses of weight boat and mixture were determined by using electronic balance.Below are resources that will support what is taught through out the entire unit. Resources have been organized by the individual modules. Resources include books, articles, YouTube videos and websites including interactive activities.
Search this Guide Search. Activities Chem4Kids Activities and Quizzes.
Classroom Resources: Chemistry Basics
Could also be used for extension activities. Check out the other great links and resources for other areas! Google Custom Search Loading. Resources Below are resources that will support what is taught through out the entire unit. Interactive Perodic Table of Elements This periodic table of elements supports other languages and can be very detailed.
Interactive Periodic Table of Elements On this site, you will click on the element to learn about it. Chem4Kids-Elements Allows students to learn more about the different elements. Chemistry Homepage This website about chemistry was developed my students.Sudo unable to resolve host raspberry pi
Delights of Chemistry Pictures and activities. Interactive game of matching elements with their symbols. Breakout-Periodic Table Not much educational value. Uncover the Periodic Table of elements. Creative Crosswords Crosswords testing chemistry vocabulary. Word Search General chemistry word search and finds. Subject Guide. Amber Nickel. Report a problem.I'm doing this lab for Chemistry and I have NO materials.
Can someone help or tell me wht'll happen with this procedure? Magic marker inks are often mixtures of several compounds. Paper chromatography is a common method of separating various components of a mixture. After separation, you can observe the different colors that make up a particular color of magic marker ink. You can also calculate a ratio Rf, which compares how far each compound traveled to how far each solvent substance that dissolves another substance traveled during the experiment.
Cut 3 strips of coffee filter. Be sure that the strips are much narrower and slightly taller than the drinking glasses. In the center the strips, about 3 cm from one end, place a dot of the marker to be tested. The dots should be about 0. Tape the unmarked end of each strip to the center of a pencil so that the strip hangs down when the pencil is held horizontally.
Carefully insert the strips into the glasses, dotted end down. The dot must be above the water, and the sides of the coffee filters cannot touch the sides of the glasses. Record your observations after 20 minutes in the table below. Measure Df in cm for the solvent. Measure the Ds in cm for each color that you see on the coffee filter there may not be three.
Calculate the Rf for each color using the equation in the Introduction section. Is there someone else in your class who you can borrow the materials from? Measure the distance from the original line where you drew the dots to the new location of the dots. The water and alcohol may have different measurements, but the ratios should be consistent. It depends on your particular taste in classes.
I've always found Chemistry to be more fun, but I'm a Chemistry major, so the decision is biased. Chromatography: Separating Mixtures Introduction: Magic marker inks are often mixtures of several compounds.
Place about 2 cm of water in each glass. Let the setup stand for 20 minutes. Follow procedure 8 as your setup stands. Repeat steps 1—7, except place about 2 cm of rubbing alcohol in each glass instead of water. Clean up your work area. Answer Save. Scharri Lv 4.
Still have questions?In this virtual lab you will determine the identity of several unknown metal powders by calculating their densities. Print out the handout found in the sidebar to record data as necessary.
Click on the following link to take you to a new window where you will find some JAVA applets for a virtual chemistry lab. Record the mass of the empty cylinder on the data sheet. Remove the graduated cylinder from the balance by clicking and dragging.Ubc cpsc 340
Click and drag the Metal 1 bottle and place it so that the bottle and the graduated cylinder overlap. This gets the metal ready to be dispensed into the cylinder. Click and hold the POUR tab at the bottom of the screen. When you release the hold, the solid will be in the cylinder and you should read the volume from the graduated cylinder. Record to at least the tenths place on your data sheet. Place the filled graduated cylinder on top of the balance and record the new mass.
Using the values given in the Problem Description, and comparing those values to the density you calculated in your data table, what is the identity of metal 1? Using the values given in the Problem Description, and comparing those values to the density you calculated in your data table, what is the identity of metal 2? Using the values given in the Problem Description, and comparing those values to the density you calculated in your data table, what is the identity of metal 3?
This unit is designed to be used at beginning of the school year. In this activity, students will investigate methods for purifying water as they consider a survival based situation that requires clean drinking water. Students will investigate processes such as boiling and distillation, as well as review the phase changes within the water cycle. In this lab students will compare and contrast mixtures and solutions.
They will be tasked with extracting iron from various breakfast cereals. They will then conclude which cereal would be the healthiest for Iron Man to eat for breakfast. In this lesson students will use simple laboratory tests to characterize differences between solutions, colloids, and suspensions.
They will then apply those tests to paints to classify them as specific types of mixtures. In this lesson the students will become familiar with some ways that chemistry is present in their everyday lives. The teacher will read a book and show a short video about how a plastic bottle is made. Following these activities, students will interact with a variety of materials made of plastic, ultimately organizing them according to the recycling code printed on the bottom of each or by physical properties.
Finally students will collect data and have an opportunity to construct a graph based on their data. In this activity the students will separate a mixture and classify objects by their physical properties. In this lab, students will investigate an endothermic chemical reaction by combining baking soda, hand soap and citric acid. The students will be tasked with differentiating between chemical and physical changes during this experiment. In this lab, students use molarity concepts to review limiting reactant concepts mathematically, conceptually, and graphically.
They can then carry out a follow up investigation to identify an unknown using concepts learned in the first investigation. In this lab, students react copper II chloride with aluminum to determine the limiting reactant.
They then isolate one product to determine their percent yield. In this lab, students will convert copper metal into different copper compounds and then back to copper to illustrate conservation of matter.Nds to cia injector
In this activity, students will use models to explore structural isomers, and create explanations for the impact of structure on intermolecular forces London dispersion and physical properties boiling point. In this lab, students will mix four substances in a test tube and recreate the original four layers through chemical and physical means.
In this lesson, students will be introduced to simple distillation while expanding their knowledge of intermolecular forces. Once a simple distillation has been accomplished in the lab, students will then research the various products of fractional distillation of crude oil and report on one of those products.
In this lab, students complete a simple distillation lab separating water from cinnamon and food coloring. In this lab, students will separate iron filings from iron-fortified breakfast cereals. Students will use the recorded data to conduct percent composition calculations.
In this lab, students devise their own method to separate a mixture of sand, salt, poppy seeds, and iron filings. In this activity, students will play a game to review topics relating to physical properties of matter, including mixtures, states of matter, and gas laws. They will be prompted with questions in a PowerPoint and they will use white boards to communicate their answers. In this lab, students will see the distillation procedure using a common soft drink and a simple equipment setup.
In this lab, students will perform a step by step process of mixing and separating substances based on their states and solubility in order to solve a problem.Wv cps investigation timeline
In this lab, students will learn that mixtures are created by the combination of two or more substances. Many colors are actually mixtures of several different pigments.
Mixtures can be separated, and in this lab students will perform chromatography to separate mixtures found in candy and in leaves.
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