Have an account?
Skip to Content
Build your own quiz
30 questions
Show Answers
See Preview
- 1. Multiple Choice
What is true about a chemical equation?
the number of atoms can be different on the reactant and product side
the atoms of each element should be the same on both the product and reactant side
the elements can be different on the reactant and product side
the substances in a chemical reaction stay the same
- 2. Multiple Choice
Which of the pictures below best represents a chemical equation that is not balanced?
- 3. Multiple Choice
Which equations below shows a new substance being formed?
2H2O + O2 ---> H2O + O
NH3 + HCl ---> HCl + NH3
2NaO + 2H2O ---> 4NaOH + O2
2Al + 3Mn + O3 ---> Al + Mn + O3
- 4. Multiple Choice
During a science lab, two students poured a white, powdered solid into a bag. Then they poured a colorless liquid into the same bag. They closed the bag and noticed that bubbles formed and the temperature started to decrease. What most likely happened?
The substances reacted chemically.
The liquid went through a rapid phase change.
The student's hand was cold which made the substance turn cold.
Some of the liquid started to freeze, making the bag cold.
- 5. Multiple Choice
The equation above represents a chemical reaction. How many atoms are represented in the products of this equation?
4
5
6
7
- 6. Multiple Choice
Which chemical formula has twice as many oxygen (O) atoms as potassium (K) atoms?
KHCO3
KOH
K2SO4
KNO3
- 7. Multiple Choice
How many total atoms are in the molecule of potassium acetate above?
8
7
9
5
- 8. Multiple Choice
What is the large number written before a chemical formula called?
Coefficient
Subscript
Reactant
Product
- 9. Multiple Choice
What is the small number written after a chemical symbol called?
Coefficient
Subscript
Product
Reactant
- 10. Multiple Choice
In the reaction methane + oxygen turns into carbon dioxide + water, the methane and oxygen are called _______________.
reactants
products
neutrals
energizers
- 11. Multiple Choice
In any chemical reaction, the mass of the products is always:
slightly less than the mass of the reactants
much less than the mass of the reactants
the same as the mass of the reactants
greater than the mass of the reactants
- 12. Multiple Choice
How do chemical reactions turn substances into new substances?
with burning acid
the molecules mix together and create new substances
the atoms break apart and combine back together in new ways
the ionic compounds mix in water to form solutions
- 13. Multiple Choice
Why must chemical equations be balanced?
So that the equation doesn't explode
The reaction won't happen until it is balanced
Based on the Law of Conservation of Matter, matter cannot be created or destroyed.
Based on the Law of Conservation of Energy, energy cannot be created or destroyed.e
- 14. Multiple Choice
The left side of the equation below is called
Products
Reactants
- 15. Multiple Choice
The right side of the equation below is called the
products
reactants
- 16. Multiple Choice
A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
Coefficient
reactant
subscript
product
- 17. Multiple Choice
How many atoms of hydrogen (H), sulfur (S), and oxygen (O) are there in sulfuric acid (H2SO4)?
H-6, S-4, O-4
H-1, S-2, O-8
H-2, S-1, O-4
H-2, S-4, O-4
- 18. Multiple Choice
How many Oxygen (O) atoms are in 2C2HO8Cl2
2
16
8
5
- 19. Multiple Choice
How many elements are in C6H12O6?
1
2
3
4
- 20. Multiple Choice
What is the arrow in a chemical equation...
H2 + O --> H2O
Reactants
Products
Yields
Chemical Equation
- 21. Multiple Choice
Is this equation balanced?
yes
no
Not enough information
- 22. Multiple Choice
Which problem is balanced?
PbO2 + 2H2
SO2 + H20 --> H2SO4
2Na + 2H2O --> 2NaOH + H2
- 23. Multiple Choice
Which of the following is a balanced chemical equation?
2Mg + HCl --> MgCl2 + H2
H2O2 --> H2O + O2
SO2 + O2 + 2H2O --> 4H2SO4
2Fe2O3 + 3C --> 4Fe + 3CO2
- 24. Multiple Choice
Which is the correct formula for 3 hydrogen atoms, one sulfur atom, and four oxygen atoms?
H3SO4
HSO4
H4S3O
H2O
- 25. Multiple Choice
Which statement best describes a chemical reaction?
A substance goes through a phase change.
Atoms separate and become smaller.
Molecules break and fly far apart from each other.
Electron bonds break, rearrange, and attach to other atoms.
- 26. Multiple Choice
Four students performed four different investigations by combining different substances. Their results are shown in the table provided. In which experiment (shown above) are new substances being formed?
Experiment 1
Experiment 2
Experiment 3
Experiment 4
- 27. Multiple Choice
Hydrogen peroxide breaks down to form water and oxygen gas. When this reaction occurred, the following observations were made:
I. The mass of the solution remains the same.
II. Phase changes are observed.
III. The color of the solution remains clear.
IV. The temperature of the solution increases.
Which observation is evidence that a chemical change has occurred?
Observation I
Observation II
Observation III
Observation IV
- 28. Multiple Choice
The chemical formula for the mineral dolomite is provided.
CaMg(CO3)2
How many atoms of carbon are present in dolomite?
2
3
6
8
- 29. Multiple Choice
Four students performed four different investigations by combining different substances. Which of the observations above is most indicative of a chemical reaction?
Investigation 1
Investigation 2
Investigation 3
Investigation 4
- 30. Multiple Choice
In a container, a solid consisting of clear crystals is combined with a blue liquid and the following observations are obtained:
• The color of the liquid changes from blue to yellow.
• The solid got smaller.
• Solution temperature changed from 25°C to 30°C.
• Bubbles were forming in the container.
How many of the listed observations indicate a new substance was formed?
1
2
3
4
- Answer choicesTagsAnswer choicesTags