Balancing Chemical Equations
Flashcard
•
Science
•
8th Grade
•
Hard
+2
Standards-aligned
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19 questions
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1.
FLASHCARD QUESTION
Front
Which titled article is specifically about a chemical change? Options:
How Baking Soda Reacts with Vinegar
,How Rust Can Be Scraped off of Metal
,How Metals Respond to Electrical Currents
,How Elements Can Change Phase When Heated
Back
How Baking Soda Reacts with Vinegar
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-5
2.
FLASHCARD QUESTION
Front
If you cut a wooden block in half, each half would have:
- Half the density of the original piece
- Twice the density of the original piece
- The same density as the original piece
Back
The same density as the original piece
3.
FLASHCARD QUESTION
Front
Which best represents a balanced equation? Options: 120 grams of carbon plus 20 grams of oxygen → 200 grams of carbon dioxide, 120 grams of carbon plus 50 grams of oxygen → 200 grams of carbon dioxide, 120 grams of carbon plus 80 grams of oxygen → 200 grams of carbon dioxide
Back
120 grams of carbon plus 80 grams of oxygen → 200 grams of carbon dioxide
Tags
NGSS.MS-PS1-5
4.
FLASHCARD QUESTION
Front
How many atoms of hydrogen are involved in the reaction 2H2O2 → 2H2O + O2?
Back
4
Tags
NGSS.MS-PS1-1
NGSS.MS-PS1-2
NGSS.MS-PS1-5
5.
FLASHCARD QUESTION
Front
Number of hydrogen atoms in two molecules of ammonia formed from 2 nitrogen and 6 hydrogen atoms?
Back
6
Tags
NGSS.MS-PS1-1
6.
FLASHCARD QUESTION
Front
Which is best represented by the equation? 2Mg + O2 → 2MgO
Back
Law of Conservation of Mass
Tags
NGSS.MS-PS1-5
7.
FLASHCARD QUESTION
Front
When chemicals react in a closed container, which must be true?
Back
The mass both before and after the reaction is the same.
Tags
NGSS.MS-PS1-5
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