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#### * 3. After performing this hands-on activity, please rate how well you understand the following concepts:

 Not at all A little Mostly Very When the sizes of magnetic particles are sufficiently small (approx. 10nm, i.e. nanoparticles), they become single tiny magnets, align to the vector direction of a magnetic field, and are affected by the force from the magnetic field, hence forming a magnetic fluid in a solution. When the sizes of magnetic particles are sufficiently small (approx. 10nm, i.e. nanoparticles), they become single tiny magnets, align to the vector direction of a magnetic field, and are affected by the force from the magnetic field, hence forming a magnetic fluid in a solution. Not at all When the sizes of magnetic particles are sufficiently small (approx. 10nm, i.e. nanoparticles), they become single tiny magnets, align to the vector direction of a magnetic field, and are affected by the force from the magnetic field, hence forming a magnetic fluid in a solution. A little When the sizes of magnetic particles are sufficiently small (approx. 10nm, i.e. nanoparticles), they become single tiny magnets, align to the vector direction of a magnetic field, and are affected by the force from the magnetic field, hence forming a magnetic fluid in a solution. Mostly When the sizes of magnetic particles are sufficiently small (approx. 10nm, i.e. nanoparticles), they become single tiny magnets, align to the vector direction of a magnetic field, and are affected by the force from the magnetic field, hence forming a magnetic fluid in a solution. Very To create one unit of magnetic nanoparticle (Fe2O3), we must provide the exact stoichiometric ratio of two units of FeCl3 and one unit of FeCl2. Incorrect concentrations in our redox reaction will produce other type of nanoparticles that do not have the desirable magnetic properties. To create one unit of magnetic nanoparticle (Fe2O3), we must provide the exact stoichiometric ratio of two units of FeCl3 and one unit of FeCl2. Incorrect concentrations in our redox reaction will produce other type of nanoparticles that do not have the desirable magnetic properties. Not at all To create one unit of magnetic nanoparticle (Fe2O3), we must provide the exact stoichiometric ratio of two units of FeCl3 and one unit of FeCl2. Incorrect concentrations in our redox reaction will produce other type of nanoparticles that do not have the desirable magnetic properties. A little To create one unit of magnetic nanoparticle (Fe2O3), we must provide the exact stoichiometric ratio of two units of FeCl3 and one unit of FeCl2. Incorrect concentrations in our redox reaction will produce other type of nanoparticles that do not have the desirable magnetic properties. Mostly To create one unit of magnetic nanoparticle (Fe2O3), we must provide the exact stoichiometric ratio of two units of FeCl3 and one unit of FeCl2. Incorrect concentrations in our redox reaction will produce other type of nanoparticles that do not have the desirable magnetic properties. Very Solid materials can be dispersed in the colloidal suspension if their sizes are very small, on the order of ten nanometers. Solid materials can be dispersed in the colloidal suspension if their sizes are very small, on the order of ten nanometers. Not at all Solid materials can be dispersed in the colloidal suspension if their sizes are very small, on the order of ten nanometers. A little Solid materials can be dispersed in the colloidal suspension if their sizes are very small, on the order of ten nanometers. Mostly Solid materials can be dispersed in the colloidal suspension if their sizes are very small, on the order of ten nanometers. Very
Please offer your explanation to the following questions:

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#### * 9. On a scale from 1 to 4, where 1 means "not at all" and 4 means "very much," rate the following

 1 2 3 4 Did you find the science you learned in this activity interesting? Did you find the science you learned in this activity interesting? 1 Did you find the science you learned in this activity interesting? 2 Did you find the science you learned in this activity interesting? 3 Did you find the science you learned in this activity interesting? 4 Do you want to learn more about how to modify material properties? Do you want to learn more about how to modify material properties? 1 Do you want to learn more about how to modify material properties? 2 Do you want to learn more about how to modify material properties? 3 Do you want to learn more about how to modify material properties? 4 How well can you explain what a magnetic fluid is to someone who doesn’t know (perhaps a younger sibling)? How well can you explain what a magnetic fluid is to someone who doesn’t know (perhaps a younger sibling)? 1 How well can you explain what a magnetic fluid is to someone who doesn’t know (perhaps a younger sibling)? 2 How well can you explain what a magnetic fluid is to someone who doesn’t know (perhaps a younger sibling)? 3 How well can you explain what a magnetic fluid is to someone who doesn’t know (perhaps a younger sibling)? 4

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