1. electroscopes Particle picturesCharge 100 200 400 300 500 100 200 300 400 500

2. Particle Pictures for 100 What is the charge on this object? How do you know? Solution

3. Particle Pictures for 100 Solution The object has more electrons than protons so it is negatively charged Home

4. Particle Pictures for 200 What are 3 things we know about this object? Solution

5. Particle Pictures for 200 Solution Neutral Insulator Polarized Home

6. Particle Pictures for 300 Please draw the mystery object on the left, it has 6 atoms in it. Solution Mystery Object Is a conductor 9 Electrons

7. Particle Pictures for 300 Solution Mystery object is a conductor It must be positively charged for the neutral object to be attracted to it Home

8. Particle Pictures for 400 Please draw these particle pictures Solution 3 electrons, insulator 9 electrons, conductor FAR APART NEAR FAR APART AFTER CONTACT Objects in their initial positions

9. Particle Pictures for 400 Solution NEAR FAR APART AFTER CONTACT Home

10. Particle Pictures for 500 Please draw these particle pictures Solution 4 electrons, conductor FAR APART NEAR FAR APART AFTER CONTACT Objects in their initial positions, they are CONDUCTORS 16 electrons, conductor 10 electrons

11. Particle Pictures for 500 Solution NEAR FAR APART AFTER CONTACT 10 electrons Home

12. Charge for 100 1) What types of objects can transfer their charge by contact? 2) What types of objects can NOT transfer their charge by contact? Solution

13. Charge for 100 Solution 1)Conductors – electrons move easily in and out of their atoms 2)Insulators – electrons do NOT easily move in and out of their atoms Home

14. Charge for 200 What are the 3 particles that make up an atom and what are their respective charges? Solution

15. Charge for 200 Solution Protons – Positive charge Electrons – Negative charge Neutrons – No charge Home

16. Charge for 300 What Charge could the mystery object have? Solution Neutral Object Mystery Object

17. Charge for 300 Solution The electrons in the Neutral Object are attracted to the mystery object, therefore the mystery object must be positively charged. Neutral Object Home

18. Charge for 400 What charge could the mystery object have? Solution Positively Charged Object Mystery Object

19. Charge for 400 Solution The mystery object could be negative or neutral as the electrons in the positively charged balloon are being repelled by the electrons in the mystery object Or Neutral Positively Charged Object Home

20. Charge for 500 Please draw the mystery object with 8 atoms. Is there more than one correct answer? explain Solution Mystery object Is an insulator NEAR

21. Charge for 500 Solution NeutralPositive Home OR

22. Electroscopes for 100 Solution FACT - This electroscope is Neutral Why is the needle/straw of this electroscope rotated? What is the term we use to describe this electroscope? Positively Charged Object, near but not in contact

23. Electroscopes for 100 Solution The electrons move up to the top of the electroscope leaving the bottom positively charged, so the needle rotates We say this electroscope is polarized Positively Charged Object, near but not in contact Home

24. Electroscopes for 200 What two things do we know about this electroscope? Solution

25. Electroscopes for 200 Solution The electroscope is Neutral because the needle is not rotated It is also not polarized Home

26. Electroscopes for 300 What do we know about the charged object? What do we know about the mystery object? Do these objects have anything in common? Solution A charged object is placed on top of the electroscope and is moved FAR AWAY. A mystery object is then BROUGHT NEAR the electroscope and the result is shown below.

27. Electroscopes for 300 Solution 1.The charged object is a conductor 2.The mystery object is charged opposite of the charged object. 3.We can not determine the material of the mystery object because it has not contacted the electroscope A charged object is placed on top of the electroscope and is moved FAR AWAY. A mystery object is then BROUGHT NEAR the electroscope and the result is shown below. Home

28. Electroscopes for 400 Solution A charged object is placed on top of the electroscope and is moved FAR AWAY. A mystery object is then IN CONTACT with the electroscope and the result is shown below. What do we know about the charged object? What do we know about the mystery object? Do these objects have anything in common?

29. Electroscopes for 400 Solution A charged object is placed on top of the electroscope and is moved FAR AWAY. A mystery object is then IN CONTACT with the electroscope and the result is shown below. 1.The charged object is a conductor 2.The mystery object is charged the same as the charged object 3.We can not determine the material of the mystery object because it is still in contact with the electroscope Home

30. Electroscopes for 500 Solution All objects are FAR away A positively charged object is in contact All objects are FAR AWAY AGAIN A mystery object is in CONTACT All objects are FAR AWAY AGAIN 1.What type of object was the positively charged object? 2.What TWO things do we know about the mystery object? 3.Explain your answers!

31. Electroscopes for 500 Solutions All objects are FAR away A positively charged object is in contact All objects are FAR AWAY AGAIN A mystery object is in CONTACT All objects are FAR AWAY AGAIN 1.The positively charged object is a conductor because it transfers its charge to the electroscope 2.The mystery object is positively charged and an insulator because the electroscope indicated an increased SAME charge and it did not transfer its charge to the electroscope Home