Grade 8 Ch 5 L 2: Types Of Chemical Reactions
- 1.Which is the BEST indication that a chemical reaction has taken place?
- A.
Blue powder turns water blue
- B.
A white substance dissolving in water
- C.
Metal bubbling when placed in an unknown liquid
- 2.What is an example of a synthesis reaction?
- A.
CO2 breaking down to C + O2
- B.
Zn + 2HCl -> ZnCl2 + H2
- C.
Hydrogen and Oxygen combining to form water (2H2 + O2 -> 2H2O)
- 3.
![What kind of a reaction is this? Please give an example. - ProProfs]( "What kind of a reaction is this? Please give an example.")
What kind of a reaction is this? Please give an example.- A.
Double Replacement: NaCl + AgNO3 -> NaNO3 + AgCl
- B.
Synthesis: C + O2 -> CO2
- C.
Decomposition: 2H2O -> 2H2 + O2
- 4.What are the the products in the following reaction: CH4 + 2O2 -> CO2 + 2H20
- A.
Carbon Dioxide and Water
- B.
Carbon Monoxide and Hydroxide
- C.
Salt and Vinegar
- 5.
![What kind of reaction is this? - ProProfs]( "What kind of reaction is this?")
What kind of reaction is this?- A.
Single Replacement
- B.
Double Replacement
- C.
Synthesis
- 6.What is the following chemical reaction? Zn + 2HCl -> ZnCl2 + H2?
- A.
Combustion
- B.
Single Replacement
- C.
Synthesis
- 7.Balance the equation: _H2 + _O2 -> _H2O
- A.
3H2 + 5O2 -> H2O
- B.
2H2 + _O2 -> 2H2O
- 8.Give an example of and draw a synthesis reaction
- A.
NaCl + AgNO3 -> NaNO3 +AgCl
- B.
CO2 -> C + O2
- C.
Mg + 2OH -> Mg(OH)2
- 9.What kind of reaction occurs when the negative ions in 2 compounds switch?
- A.
Decomposition
- B.
Double-replacement
- C.
Synthesis
- 10.What kind of reaction occurs when one element replaces another?
- A.
Synthesis
- B.
Combustion
- C.
Single Replacement
- 11.What kind of reaction occurs when a compound breaks down?
- A.
Decomposition
- B.
Synthesis
- C.
Combustion
- 12.What kind of reaction is opposite of decomposition?
- A.
Single Replacement
- B.
Decomposition
- C.
Synthesis
- 13.What kind of reaction has only ONE reactant?
- A.
Single Replacement
- B.
Decomposition
- C.
Synthesis
- 14.Which one is an example of combustion?
- A.
Burning wood
- B.
Making Salt
- C.
Making salt water taffy
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