![]() ![]() ![]() The solute is the part of the solution being dissolved. The solvent is the part of the solution that is doing the dissolving. A solution is a homogeneous mixture made up of two parts solvent and solute. A suspension is a mechanical mixture in which the particles of the solute are temporarily suspended in the solvent but can eventually settle out due to gravity. A Colloid is a mechanical mixture in which the solute particles are so tiny that cannot be separated by gravity and remain suspended in the solvent. A qualitative property is a property of an object that can be described using your five senses (colour, odour, taste.)Ī quantitative property describes matter in terms of measurements. Examples: oil + water = heterogeneous, sand + charcoal powder = heterogeneous, sugar + water = homogeneous. Homogeneous mixtures show only one phase whereas heterogeneous mixtures show two or more phases. Mechanical mixtures can be heterogeneous or homogeneous. The density of maple wood (D = 760 Kg/m3) is less than the density of water (1000Kg/m3).Ģ. The density of water in a cup of water taken from a fountain is the same as the density of water taken from a pool (ignoring the chlorine in it).ī) The mass of water in a cup is much smaller than the mass of a wood from a maple tree. The density (click on the linked word to see density problems and solutions) of an object is the mass per unit volume of an object (D = m/V).Ī) The mass of water in a cup is much larger than the amount of water in a pool. Volume is the amount of space an object occupies. Mass is the amount of matter in an object. In a blended class, I would have the students complete this portion of the lesson on a Google Doc or using some other type of collaboration tool like Padlet.1. Start your sentences with, “Now, I think…” Again in just a few sentences write down what you now think about physical and chemical changes. Now, I want you to think about how your ideas about physical and chemical changes have changed as a result of what we’ve been studying/doing/discussing. Take a minute to think back and then write down your response to “ I used to think…” In just a few sentences, I want to write what it is that you used to think about physical and chemical changes. Teacher Information : What are some tips for starting and using this routine?Įxplain to students that the purpose of this activity is to help them reflect on their thinking about the topic and to identify how their ideas have changed over time.įor instance: When we began this study of physical and chemical changes, you all had some initial ideas about it and what it was all about. Talk about and make their thinking visible to others.The I used to think.but now I think routine helps students to: Purpose : What kind of thinking does this routine encourage? The students could complete the handout during class or at home. The instructor could create a video performing the demonstration and share the video with the students.The instructor will perform the demonstration in-person and the students will record their observations and conclusions on the handout.Physical and Chemical Changes Demonstration: The formation of a precipitate (a solid is produced out of solution). ![]() A chemical change is also called a chemical reaction. A chemical change is a change in the composition of the original substance. ![]() In the simplest sense, a physical change is a change in the form of the original substance. In chemistry, the term change can refer to both physical and chemical changes. The video could be then be shared with the students in the LMS or some other online platform. Another option is for the instructor to record a video performing the demonstration. The demonstration can be performed in person and the students can complete the demo handout during the demonstration. It is a good idea to record the indicators of chemical changes on the board as you review the background information with the class. Review the background information with students before completing the demonstration. Scientific Practices: Constructing ExplanationsĮssential Question : How can you distinguish between a physical and a chemical change? HS-PS1.B: Chemical Reactions - The face that atoms are conserved, together with the knowledge of the chemical properties of the elements involved, can be used to describe and predict chemical reactions. ![]()
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