matatag curriculum_use of models_sci 7.pptx

Use of Models

1. GRADE 7 SCIENCE 1

2. Activity 1 PICTURE PUZZLE Directions: Arrange the irregularly cut pieces of an image until a picture is formed. Answer the guide questions that follow. You are given three (3) minutes to finish the activity. 2

3. Guide Questions: What object was formed in picture 1? Picture 2? Describe the function of each picture. Which of the pictures is used in creating a planetary model? What about a model of cell structures? What other models are you familiar with? Explain briefly. 3

4. Objectives: At the end of the lesson, you shall be able to identify the different models used by scientists to explain phenomena that cannot be easily seen or detected. 4

5. Scientific Modeling the generation of a physical, conceptual, or mathematical representation of a real phenomenon that is difficult to observe directly. Scientific models are used to explain and predict the behaviour of real objects or systems and are used in a variety of scientific disciplines, ranging from physics and chemistry to ecology and the Earth sciences. 5

6. Activity 2: Let’s Read, then Write! Directions: Divide the class into five groups. Each group will be given an article to read. List down unfamiliar terms, phrases, or sentences as well as describe any that may be confusing ones. Share your insights on the terms, phrases, sentences cited or identified. Accomplish the Table and answer the guide questions. 6

7. Guide Questions: 1. Name the scientist/s who used model to explain phenomena that cannot be easily seen or detected. 2. What are the different models used by scientists to explain phenomena that cannot be easily seen or detected? 3. What is your observation on the illustration of each model? 4. In your opinion, why do scientists provide models to explain phenomena that cannot be easily seen or detected? 7

8. Atomic Models Dalton’s Atomic Model Thomson’s Atomic Model Rutherford’s Atomic Model Bohr’s Atomic Model Quantum Atomic Model 8

9. Dalton’s Atomic Model It was put forward by the English physicist and chemist John Dalton. It stated that matter is made up of small indivisible particles called ‘atoms’. According to this theory, all substances are made up of atoms, which are indivisible and indestructible. While atoms of same element has same size and mass, atoms of different elements have different size and mass. 9

10. Thomson’s Atomic Model It was put forward by J.J. Thomson. It was also called plum pudding model. This model explained the inner structure of atom theoretically. According to Thomson, an atom resembles a sphere of positive charges with electrons distributed inside it. Here, positive and negative charges are equal in magnitude and therefore an atom is electrically neutral. 10

11. Rutherford’s Atomic Model It was put forward by the British scientist Ernest Rutherford. The model by Thomson was not able to explain certain results associated with the atomic structure of elements, so this model came into existence. This model described atom a s a tiny, dense, positively charged core called nucleus, in which nearly all the mass is concentrated , around which the negatively charged electrons circulate like planets moving around the sun. 11

12. Bohr’s Atomic Model It was put forward by the Danish physicist Neil Bohr. It is similar to Rutherford model. The Bohr model is a planetary model in which negatively charged particles orbit positively charged nucleus similar to planets orbiting the sun. Coulomb force exists between these positive and negative particles. 12

13. Quantum Atomic Model It was put forward by Austrian physicist Erwin Schrödinger. It stated that the behavior of atoms can be explained more clearly by treating them mathematically as matter waves. This model is called quantum mechanical or wave mechanical model 13

14. Activity 3: Did You Get It Right? Directions: Bring out ¼ sheet of paper. Listen to the questions very carefully as they will be read twice only. Write the letter of your choice on your paper.