Chemistry Exam Review #1
Flashcard
•
Chemistry
•
9th - 12th Grade
•
Hard
Wayground Content
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15 questions
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1.
FLASHCARD QUESTION
Front
What is the percent by mass of oxygen in CO₂?
Back
To calculate the percent by mass of oxygen in CO₂, use the formula: (mass of oxygen / total mass of CO₂) x 100. CO₂ has 2 oxygen atoms (16 g each) and 1 carbon atom (12 g), so the total mass is 12 + 32 = 44 g. Percent by mass of oxygen = (32/44) x 100 ≈ 72.73%.
2.
FLASHCARD QUESTION
Front
What is the chemical formula for sodium sulfate?
Back
The correct chemical formula for sodium sulfate is Na₂SO₄.
3.
FLASHCARD QUESTION
Front
What type of bond forms between nonmetals?
Back
Covalent bonds form between nonmetals.
4.
FLASHCARD QUESTION
Front
Why are iron filings preferred over an iron nail in reactions?
Back
Iron filings are used instead of an iron nail to increase the surface area of the reaction, allowing for a faster reaction rate.
5.
FLASHCARD QUESTION
Front
What type of chemical reaction is represented by the equation 2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O?
Back
This equation represents a combustion reaction.
6.
FLASHCARD QUESTION
Front
Define combustion reaction.
Back
A combustion reaction is a chemical reaction that occurs when a substance combines with oxygen, releasing energy in the form of light or heat.
7.
FLASHCARD QUESTION
Front
What is the molecular formula for sulfur dioxide?
Back
The molecular formula for sulfur dioxide is SO₂.
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