Twenty Questions Capítulo 7 Vocabulario Twenty Questions 12345 678910 1112131415 1617181920.
Twenty Questions Review for Test Twenty Questions 12345 678910 1112131415 1617181920.
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Transcript of Twenty Questions Review for Test Twenty Questions 12345 678910 1112131415 1617181920.
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Twenty Questions
Review for Test
![Page 2: Twenty Questions Review for Test Twenty Questions 12345 678910 1112131415 1617181920.](https://reader036.fdocuments.net/reader036/viewer/2022062407/56649e365503460f94b2653a/html5/thumbnails/2.jpg)
Twenty Questions
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16 17 18 19 20
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1. What are the four signs of a chemical reaction?
Change in color Produces a gas Forms a solid Produces energy
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2. A chemical reaction that gives off energy.
Exothermic Reaction
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3. A shorthand notation that uses chemical symbols and numbers to represent a substance.
Chemical Formula
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4. The 2 in the formula Ag₂S is called a ____________
Subscript
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5. What kind of reaction forms a new substance that has different properties than the starting substances?
A Chemical Reaction
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6. How many total atoms does 4NaOCl have?
12 total atoms
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7. A solid formed in a solution as a result of a chemical reaction.
precipitate
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8. The number written below and to the right of a chemical symbol in a formula.
A subscript
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9. The starting materials in a chemical reaction. Located on the left side of the yield sign.
Reactants
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10. The substances formed from a reaction. They are located on the right side of the yield sign.
product
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11. A ___ uses chemical formulas as a shorthand description of a chemical reaction.
Chemical equation
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12. The law that states mass is neither created nor destroyed in ordinary chemical and physical changes.
The law of conservation of mass. .
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13. The law that states that energy can be neither created nor destroyed.
The law of conservation of energy.
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14. The smallest amount of energy needed for substances to react.
Activation energy
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15. A substance that speeds up a reaction without being permanently changed.
catalyst
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16. A substance that slows down or stops a chemical reaction.
An inhibitor
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17. A slice of apple turning brown is an example of a ________ change.
chemical
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18. Breaking a stick in half is an example of a _____change.
physical
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19. Balance the following equation: HCl + Na₂S �H₂S + NaCl
2HCl + Na₂S ⃗�H₂S ⃗+ ⃗2NaCl
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20. What is the chemical formula for Carbon dioxide?
CO₂