TEKS Grade 8 Science - 8.5.E The Law of Conservation of Mass

Quiz by Texas Education Agency

Science (2017)
Texas Essential Knowledge and Skills (TEKS)

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### Measures 1 skill fromGrade 8Science (2017)Texas Essential Knowledge and Skills (TEKS)

8.5e

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6 questions
• Q1
A teacher asks a student to write the chemical equation for photosynthesis. The student’s response is shown below. The equation is not balanced correctly. Which of these is a balanced equation for photosynthesis?
#texas/42f49aba-ff70-48a8-84e8-a30523320ff9/C.png
#texas/42f49aba-ff70-48a8-84e8-a30523320ff9/D.png
#texas/42f49aba-ff70-48a8-84e8-a30523320ff9/A.png
#texas/42f49aba-ff70-48a8-84e8-a30523320ff9/B.png
60s
8.5e
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• Q2
60s
8.5e
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• Q3
Users enter free text
60s
8.5e
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• Q4
Which BEST explains why the total mass of the product(s) would be less than the total weight of the reactant(s) after a chemical reaction?
Physical change occurred.
Atoms involved in the reaction lost mass.
Gases were released to the atmosphere.
Precipitates were created in the new solution.
60s
8.5e
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• Q5
If a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products?
3 atoms of carbon (C)
6 atoms of carbon (C)
12 atoms of carbon (C)
2 atoms of carbon (C)
60s
8.5e
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• Q6
How does a balanced chemical equation satisfy the Law of Conservation of Mass?
During a chemical reaction, the total number of atoms increases.
During a chemical reaction, matter is destroyed.
During a chemical reaction, one or more new substances are formed.
During a chemical reaction, the total amount of matter stays the same.
60s
8.5e
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