Matter Interactions Unit Test

7 of 13 Items

Item 7
Use the table to answer the question.

Observation # Before Reaction During/After Reaction
1 mass = 30 grams mass = 42 grams
2 atoms of H = 5 atoms of H = 5
3 no gas gas present
4 two types of molecules three types of molecules
A scientist makes several observations about a chemical reaction and records them in the table shown. Which observation contains an error?

(1 point)

2

3

4

1

8 answers

I would say observation 1 because during a chemical reaction no new atoms are formed and no atoms are taken away, a chemical reaction involves gases, and a chemical reaction can change the number of molecules.

lets hope you right

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-Chloe♥

nobody asked chloe

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Well Chloe was just trying to do what's right what's up with y'all