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Published byLeslie McLaughlin Modified over 9 years ago
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Chemical Changes Challenge
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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.)
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Chemical Changes 12345 678910 1112131415 1617181920 2122232425
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1. When blue litmus paper turns red, it indicates that it is a(n) Click for answer Answer: acid
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2. This type of indicator measures the exact strength of acids and bases Click for answer Answer: pH paper
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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
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4. What is an electrically charged particle with unequal numbers of protons and electrons called? Click for answer Answer: ion
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5. What a group of covalently bonded atoms that act like a single particle called? Click for answer Answer: molecule
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6. What is a way of describing a substance by how it reacts to other substances? Click for answer Answer: chemical property
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7. A chemical reaction that gives off heat is called what? Click for answer Answer: exothermic
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8. When red litmus paper turns blue, it indicates the substance is a(n) Click for answer Answer: base
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9. What is a change that produces substances that have a new and different properties called? Click for answer Answer: chemical change
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10. What kind of bonds do nonmetals usually form? Click for answer Answer: covalent bond
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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
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12. What kind of change occurs when iron rusts? Click for answer Answer: chemical change or synthesis reaction
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13. What type of chemical reaction is Mentos put into Diet Coke? Click for answer Answer: decomposition reaction
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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
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15. The new substance produced from a chemical change is called what? Click for answer Answer: products
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16. Physical or chemical change? Butter melting on warm toast? Click for answer Answer: physical change
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17. What is the chart of elements arranged by the atomic number? Click for answer Answer: Periodic Table
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18. Chemical or physical change? Painting a table red? Click for answer Answer: physical change
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19. A substance that changes color in the presence of a test substance is known as what? Click for answer Answer: an indicator
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20. The middle columns of the Periodic Table contain mostly what type of element? Click for answer Answer: metals
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21. What is an electrically charged atom called? Click for answer Answer: ion
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22. Which kind of bond shares atoms? Click for answer Answer: covalent bonds
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23. What is the last shell of an atom called? Click for answer Answer: valence
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24. How many electrons are in the first shell of an atom? Click for answer Answer: 2
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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.
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