LOCOM, Elements, and The Periodic Table Practice
Flashcard
•
Chemistry
•
8th Grade
•
Practice Problem
•
Easy
Donna Ross
Used 2+ times
FREE Resource
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30 questions
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1.
FLASHCARD QUESTION
Front
What is this element's atomic number?
Back
12
2.
FLASHCARD QUESTION
Front
According to the law of conservation of matter, which statement about chemical reactions is true?
Back
Atoms cannot be created or destroyed by chemical reactions.
3.
FLASHCARD QUESTION
Front
Samantha's chemical reaction: 15g baking soda + 10g acetic acid. Mass of products after reaction: 23g. How much gas was not collected?
Back
2g
4.
FLASHCARD QUESTION
Front
What is true about a closed system during a chemical reaction?
Back
The total mass in the system stays the same.
5.
FLASHCARD QUESTION
Front
Identify the chemical equation that follows the Law of the Conservation of Matter: 2C₂H₆ + 6O₂ → 2CO₂ + 6H₂O , H₂ + Cl₂ → 2HCl , C₂H₆ + O₂ → 2CO₂ + 2H₂O, N₂ + 3H₂ → NH₃
Back
H₂ + Cl₂ → 2HCl
6.
FLASHCARD QUESTION
Front
How many oxygen (O2) molecules are produced from the splitting of two molecules of water (H2O) according to the balanced equation: 2H2O →2H2 + O2?
Back
1
7.
FLASHCARD QUESTION
Front
Pure sodium metal explodes when it makes contact with water. In its natural state, chlorine is a deadly, poisonous gas. When these two chemicals combine, they form sodium chloride or table salt. Which statement does this information support?
Back
When substances are chemically combined, the properties of the newly formed substances are often different from the properties of the original substances.
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