Chemical Reactions Quiz: MCQ Exam!
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- 1.Which one of the following represents a physical change?
- A.
Iron rusting
- B.
Paper burning
- C.
Water freezing
- D.
Dynamite exploding
- 2..O {font-size:149%;} You can tell a chemical reaction because it always produces …
- A.
A different substance
- B.
Reactants
- C.
A change of state
- D.
Water
- 3.Slide 5 To balance a chemical equation, you should change only the…
- A.
Subscripts
- B.
Coefficients
- C.
Chemical formulas
- D.
Location of the arrow
- 4.Slide 6 .O {font-size:149%;} If iron combines with oxygen to make iron oxide, the reactants are…
- A.
Iron oxide
- B.
Iron and iron oxide
- C.
Iron and oxygen
- D.
Oxygen and iron oxide
- 5.Slide 7 How many carbon atoms are there in C12H22O11?
- A.
6
- B.
12
- C.
18
- D.
45
- 6.Slide 8 How many oxygen atoms are in the product of this equation: 2H2 + O2 --> 2H2O
- A.
2
- B.
4
- C.
8
- D.
12
- 7.Slide 9 .O {font-size:149%;} Which one of the following is a chemical equation?
- A.
Ice + heat --> water
- B.
Iron + oxygen --> rust
- C.
CO2
- D.
C + O2 --> CO2
- 8..O {font-size:149%;} Balance the following equation: Ag + O2 --> Ag2O
- A.
Put a 2 in front of Ag
- B.
Add a subscript 2 to the end of Ag2O
- C.
Add a 4 in front of Ag and a 2 in front of Ag2O
- D.
Add a 2 in front of Ag and a 1 in front of Ag2O
- 9..O {font-size:149%;} In a chemical equation, the arrow means what?
- A.
A reaction is happening.
- B.
The two sides are equal.
- C.
The products flow into reactants.
- D.
The equation is balanced.
- 10..O {font-size:149%;} The reactants include 7 grams of C and 4 grams of O. What is the total amount of C and O in the products?
- A.
7 grams
- B.
4 grams
- C.
11 grams
- D.
None
- 11..O {font-size:149%;} Who first determined that the masses of the reactants and products must be the same?
- A.
Pasteur
- B.
Archimedes
- C.
Galileo
- D.
Lavoisier
- 12..O {font-size:149%;} If you try to balance an equation by changing subscripts you change…
- A.
The number of molecules of product
- B.
The identity of the compound
- C.
The atomic number
- D.
The mass of the reactants
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