
Chemical Reactions and Balancing Concepts

Interactive Video
•
Chemistry, Science
•
7th - 10th Grade
•
Easy

Liam Anderson
Used 2+ times
FREE Resource
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary purpose of a chemical reaction?
To increase the mass of reactants
To create new elements
To change substances into different substances
To destroy matter
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In a chemical equation, what does the arrow signify?
The direction of the reaction
The equality of reactants and products
The speed of the reaction
The temperature required
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why must chemical equations be balanced?
To reduce the number of reactants
To increase the number of products
To make the reaction faster
To satisfy the law of conservation of mass
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does a subscript in a chemical formula indicate?
The temperature of the reaction
The speed of the reaction
The number of atoms of an element in a molecule
The number of molecules
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do coefficients affect the balancing of chemical equations?
They multiply the number of atoms in a molecule
They increase the temperature of the reaction
They change the identity of the reactants
They decrease the number of products
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the first step in balancing a chemical equation?
Start with the heaviest element
Begin with the element that appears the most
Write down all the atoms present
Add coefficients randomly
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When balancing the decomposition of hydrogen peroxide, what must be equal on both sides?
The number of molecules
The total number of atoms
The number of oxygen atoms only
The number of hydrogen atoms only
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