Mr. Rakesh has taught the concept of chemical changes in his class. Which one of the following is the BEST example of an 'authentic task' which he can use to assess students?
Mr. Rakesh has taught the concept of chemical changes in his class. Which one of the following is the BEST example of an 'authentic task' which he can use to assess students? Correct Answer Make a protective solution that prevents rusting of iron.
A chemical change, also known as a chemical reaction, is a process in which one or more substances are altered into one or more new and different substances. In other words, a chemical change is a chemical reaction involving the rearrangement of atoms. Here a new substance may form after the change. Key Points
Making a protective solution that prevents rusting of iron is the best example of an 'authentic task' that he can use to assess students regarding the concept of chemical change because
- The process and reason for rusting of iron are explained to the student.
- A piece of iron that has rust in it is brought and shown to the students.
- Students observe the new substance formed on the iron.
- They realize this as a chemical change.
- Now the students are asked to make a protective solution that prevents rusting of iron.
- Here they can be assessed through the substance they are using to make that protective solution.
- Because the substance they use shows their understanding level regarding the chemical change.
Hence making a protective solution that prevents rusting of iron is the best example of an 'authentic task' that he can use to assess students regarding the concept of chemical change. Additional Information
On the other hand, the remaining three activities are not examples of an 'authentic task' that he can use to assess students regarding the concept of chemical change because here the students' understanding can't be assessed as everyone perform the same activity.
