
Chemical Reactions and Equations Review
Authored by Laura Korenek
Chemistry
10th - 11th Grade
NGSS covered
Used 5+ times

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36 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which of the following would indicate that a chemical reaction has occurred?
A new element has been created
A different substance has formed
The total mass has either increased OR decreased
The total number of elements has either increased OR decreased
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-5
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which would indicate a chemical equation is balanced?
If the number of atoms in the reactants is the same as the number of atoms in the products
If the atoms have ionic OR covalent bonds
If the atoms have full valence shells
If the total energy has remained the same
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-5
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
BEFORE the equation is balanced, how many Hydrogen atoms are present on the reactant side?
6
2
12
8
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-5
NGSS.MS-PS1-1
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Why does the number of Carbon atoms need to be the same on both sides of the reaction?
In a chemical reaction, no new atoms can be made
Because the number of Oxygen atoms must be balanced with the number of Carbon and Hydrogen atoms
Because the coefficients and the subscripts need to be equal
It does NOT need to be the same
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-5
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
How many sulfur atoms are present in this molecule?
4
3
12
1
Tags
NGSS.MS-PS1-1
6.
MULTIPLE SELECT QUESTION
2 mins • 1 pt
In the molecule below, which of the following choices is a subscript? (Select all that apply)
3
2
4
SO
Tags
NGSS.MS-PS1-1
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which of the following follows the Law of Conservation of Mass?
CH₄ + 2 O₂ → 2CO₂ + 2 H₂O
2 CH₄ + 2 O₂ → CO₂ + 4 H₂O
CH₄ + 2 O₂ → CO₂ + 2 H₂O
All the above
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