2. Chemical Changes Challenge

3. Instructions 1. Make teams. 2. One person from the 1 st team chooses a number. 3. Everyone answers the question. 4. The person can choose someone from his/her team to answer it. 5. 10 points if both gets it right. 6. 5 points if only one gets it right. 7. Challenge: can choose someone from another team to show their answer. If that person has it right that team will get 5 pts. If it is wrong, they lose 5 pts. (Can only choose each person once per game.)

4. Chemical Changes 12345 678910 1112131415 1617181920 2122232425

5. 1. When blue litmus paper turns red, it indicates that it is a(n) Click for answer Answer: acid

6. 2. This type of indicator measures the exact strength of acids and bases Click for answer Answer: pH paper

7. 3. What is a way of using letters and numbers to show how much of an element is in a substance? Click for answer Answer: chemical formula

8. 4. What is an electrically charged particle with unequal numbers of protons and electrons called? Click for answer Answer: ion

9. 5. What a group of covalently bonded atoms that act like a single particle called? Click for answer Answer: molecule

10. 6. What is a way of describing a substance by how it reacts to other substances? Click for answer Answer: chemical property

11. 7. A chemical reaction that gives off heat is called what? Click for answer Answer: exothermic

12. 8. When red litmus paper turns blue, it indicates the substance is a(n) Click for answer Answer: base

13. 9. What is a change that produces substances that have a new and different properties called? Click for answer Answer: chemical change

14. 10. What kind of bonds do nonmetals usually form? Click for answer Answer: covalent bond

15. 11. What kind of bond occurs when an atom of sodium joins an atom of chlorine to form sodium chloride? Click for answer Answer: ionic bond or chemical bond

16. 12. What kind of change occurs when iron rusts? Click for answer Answer: chemical change or synthesis reaction

17. 13. What type of chemical reaction is Mentos put into Diet Coke? Click for answer Answer: decomposition reaction

18. 14. When red litmus stays as red and blue litmus paper stays blue in the same substance, what does that indicate? Click for answer Answer: neutral

19. 15. The new substance produced from a chemical change is called what? Click for answer Answer: products

20. 16. Physical or chemical change? Butter melting on warm toast? Click for answer Answer: physical change

21. 17. What is the chart of elements arranged by the atomic number? Click for answer Answer: Periodic Table

22. 18. Chemical or physical change? Painting a table red? Click for answer Answer: physical change

23. 19. A substance that changes color in the presence of a test substance is known as what? Click for answer Answer: an indicator

24. 20. The middle columns of the Periodic Table contain mostly what type of element? Click for answer Answer: metals

25. 21. What is an electrically charged atom called? Click for answer Answer: ion

26. 22. Which kind of bond shares atoms? Click for answer Answer: covalent bonds

27. 23. What is the last shell of an atom called? Click for answer Answer: valence

28. 24. How many electrons are in the first shell of an atom? Click for answer Answer: 2

29. 25. What does the 2 represent in the chemical formula H 2 O. Click for answer Answer: there are 2 hydrogen atoms for every 1 oxygen atom to make water.