Counting Atoms
Flashcard
•
Science
•
7th Grade
•
Hard
Wayground Content
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15 questions
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1.
FLASHCARD QUESTION
Front
What is a balanced equation?
Back
A balanced equation has the same number of each type of atom on both sides of the equation, meaning mass is conserved.
2.
FLASHCARD QUESTION
Front
How do you determine if an equation is balanced?
Back
Count the number of atoms of each element on both sides of the equation. If they are equal, the equation is balanced.
3.
FLASHCARD QUESTION
Front
What does it mean if an equation is unbalanced?
Back
An unbalanced equation has a different number of atoms of one or more elements on each side, indicating that mass is not conserved.
4.
FLASHCARD QUESTION
Front
How many sodium (Na) atoms are in the compound NaCl?
Back
1 sodium (Na) atom.
5.
FLASHCARD QUESTION
Front
How many chlorine (Cl) atoms are in the compound NaCl?
Back
1 chlorine (Cl) atom.
6.
FLASHCARD QUESTION
Front
What is the coefficient in a chemical equation?
Back
A coefficient is a number placed in front of a compound to indicate how many molecules or moles of that compound are present.
7.
FLASHCARD QUESTION
Front
If there is a '2' in front of H2O, how many hydrogen (H) atoms are there?
Back
There are 4 hydrogen (H) atoms because 2 x 2 = 4.
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