science-9-lesson-3-nlc presenatation ELEMENTS

ELement Topic

1. Lesson 3 Elements LINDEN L. EVANGELISTA Science Teacher

2. In our class we will; Do our best CLASSROOM RULES Listen Have fun! Participate Ask questions

3. Short Overview

4. Short Overview Q1. Is a mixture a pure substance? Q2 Air contains the elements oxygen and nitrogen. Is it a mixture? Q3. Why is Hydrogen a pure substance? No, a mixture, by definition, contains more than one pure substance. Yes, it is a mixture of two elements. Hydrogen is an element, and it contains only one type of atom.

5. Lesson Purpose and Intention

6. Lesson Purpose and Intention This lesson is about the definition of a pure substance in chemistry using elements as an example. The lesson may also help you to better understand how to extract information from tables in chemistry.

7. Lesson Language Practice

8. Keywords/terms: pure substance; substance; element

9. Select one of the words above and write two sentences. One with an everyday meaning and another using the same word with a scientific meaning.

10. Lesson Activity

11. Component 4: Lesson Activity Component 4A This main lesson stimulus includes a table that provides information about some common elements.

12. Component 4: Lesson Activity Component 4A This main lesson stimulus includes a table that provides information about some common elements.

13. Component 4B Q1. Which one of the above elements have you heard of before? Q2. Which other elements do you know about that are not in the table? Q3. Which of the above elements do you find the most interesting and why? Any one of the above 7 elements. Many possible answers. Most likely Oxygen, Aluminum, Lead Helium, Magnesium, Nitrogen, Uranium, Lithium, Sodium, Iron, Copper, etc. Lead because it is poisonous and has become such a problem in our everyday lives. or Carbon because carbon dioxide is so much part of our human body but in the atmosphere can become a problem. or The element Chlorine because, as sodium chloride, it is vital to so many living things but as the gas chlorine it is toxic, etc.

14. Component 4 C Q1. Which of the elements above occurs as a gas and as the free element in nature? Q2. Which element is found in abundance in the Earth’s crust as the ore, bauxite, and which one is found as galena? Q3. (Optional) How many electrons are there in the outer shell of Carbon, Aluminum and Chlorine? The element oxygen The element aluminum is found as bauxite and lead is found as galena. The outer shell pf carbon has 4 electrons, whereas the outer shell of Aluminum has 3 electrons and Chlorine only has 1. (Chlorine has 7 valence electrons)

15. Lesson Conclusion

16. Question 1: Has this lesson helped you to better understand the differences between atoms? If so, how?

17. Question 2: Has this lesson helped you to remember the names and symbols of common elements? If so, how?

18. Question 3 : Q3. Which questions were easy to answer – the ones in Component 4B or Component 4C? Why?