Law of Conservation of Mass PreTest
Flashcard
•
Science
•
8th Grade
•
Practice Problem
•
Hard
+2
Standards-aligned
Wayground Content
FREE Resource
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10 questions
Show all answers
1.
FLASHCARD QUESTION
Front
When wood is burned, it is changed into ash and carbon is released into the atmosphere as smoke. If 2 kg of wood were burned, how much ash would result?
Back
exactly 2 kg because mass is conserved in this system
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-5
2.
FLASHCARD QUESTION
Front
Which best describes the total amount of mass present in a chemical reaction?
Back
It remains the same during the reaction.
Tags
NGSS.MS-PS1-5
3.
FLASHCARD QUESTION
Front
Amount of water needed to completely react with 25.00 grams of carbon dioxide in photosynthesis.
Back
10.23 g
Tags
NGSS.MS-LS1-6
4.
FLASHCARD QUESTION
Front
Balanced chemical reaction for the breakdown of KClO3 into simpler substances?
Back
2KClO3 → 2KCl + 3O2
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-5
5.
FLASHCARD QUESTION
Front
Which reaction shows a conservation of atoms? H2 + O2 → H2O, Na + Cl2 → NaCl, N2 + 3H2 → 2NH3, 2Al + O2 → Al2O3
Back
N2 + 3H2 → 2NH3
Tags
NGSS.MS-PS1-5
6.
FLASHCARD QUESTION
Front
Based on the Law of Conservation of Mass, which products would result from the break down of 2NaN3? Options: Na + 2N2, Na + 3N2, 2Na + 3N2, 3Na + 2N2
Back
2Na + 3N2
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-5
7.
FLASHCARD QUESTION
Front
Tyrone dissolves a cold medicine tablet in a glass of water. Before mixing, the mass of the water is 50 g and the mass of the tablet is 25 g. After mixing, a gas is given off. What is most likely correct about the mass of the final products?
Back
The final mass of the water and tablet combined would be less than 75 g.
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-5
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