Chemical Reactions unit check for understanding
Quiz
•
Science
•
7th Grade
•
Practice Problem
•
Easy
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20 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If you are given the chemical formula C₆H₁₂O₆, how would you determine the total number of atoms in one molecule?
Add the subscripts: 6 + 12 + 6
Multiply the subscripts: 6 × 12 × 6
Subtract the smallest subscript from the largest
Divide the largest subscript by the smallest
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why are synthetic materials different from natural materials?
They are made by changing natural substances through a chemical process
They are always found in nature
They do not involve any chemical changes
They are only made from metals
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following best describes when a chemical property can be observed?
When atoms rearrange during a chemical change
When the substance is heated
When the substance is dissolved in water
When the substance is broken into pieces
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following best describes a synthesis reaction?
A + B → AB
AB → A + B
AB + CD → AC + BD
Acid + base → salt and water
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In a chemical reaction, what do we call the new substances that are formed?
Reactants
Products
Catalysts
Inhibitors
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following best describes the direction of heat flow in an endothermic reaction?
Heat flows into the system from the surroundings
Heat flows out of the system to the surroundings
Heat flows equally in both directions
No heat flow occurs
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is it important to identify reactants and products in a chemical reaction?
To understand what substances are involved and what changes occur
To make the reaction faster
To avoid using any chemicals
To increase the temperature of the reaction
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