Chemical Reactions Test Period 4
Chemical Reactions
- 1.
When bonds break and rearrange to form new chemicals it is called a......- A.
Physical Change
- B.
Law of Proportions
- C.
Chemical Reaction
- D.
Chemical Property
- 2.
What is the difference between a physical change and a chemical reaction?
- A.
In a chemical recation new atoms are formed
- B.
In a chemical change bonds are broken and atoms are rearranged
- C.
In a physical change atoms are lost
- D.
In a physical change bonds are broken but in a chemical reaction they are not broken
- 3.Type in the coefecients separated by a comma and include the coeffecient "1". for example 1,2,5,2,1 would be the answer for Al + 2N2 + 5O2 => 2N2O5 + AlBalance this chemical reaction ___H2 + ___O2 => ___H2O
- 4.Type in the coefecients separated by a comma and include the coeffecient "1". for example 1,2,5,2,1 would be the answer for Al + 2N2 + 5O2 => 2N2O5 + AlBalance this chemical reaction ___C3H8 + ___O2 => ___CO2 + ___H2O
- 5.Type in the coefecients separated by a comma and include the coeffecient "1". for example 1,2,5,2,1 would be the answer for Al + 2N2 + 5O2 => 2N2O5 + AlBalance this chemical reaction ___Al(OH)3 + ___H2SO4 => ___Al2(SO4)3 + ___H2O
- 6.Why do chemist need to work with balanced equations?
- A.
Because of the law of conservation of energy
- B.
Because they just want to
- C.
Because of the law of conservation of mass
- D.
Because they need to get fast reaction rates
- 7.
The heaters in Army MRE's use a heater that give of heat when water is added. This makes the food hot and scrumptious!! What type of reaction is involved?
- A.
Endothermic
- B.
Exothermic
- 8.
At the 20 second mark of this experiment a magical reaction happens....what type is it?
- A.
Endothermic
- B.
Exothermic
- 9.What type of reaction is this? C10H22 + O2 => CO2 + H2O
- A.
Synthesis
- B.
Decomposition
- C.
Combustion
- D.
Single Replacement
- E.
Double Replacement
- 10.What type of reaction is this? KOH + HBr => KBr + H2O
- A.
Synthesis
- B.
Decomposition
- C.
Combustion
- D.
Single Replacement
- E.
Double Replacement
- 11.What type of reaction is this? N2 + H2 => NH3
- A.
Synthesis
- B.
Decomposition
- C.
Combustion
- D.
Single Replacement
- E.
Double Replacement
- 12.What type of reaction is this? Al(OH)3 + HBr => AlBr3 + H2O
- A.
Synthesis
- B.
Decomposition
- C.
Combustion
- D.
Single Replacement
- E.
Double Replacement
- 13.What type of reaction is this? Li + H2O => LiOH + H2
- A.
Synthesis
- B.
Decomposition
- C.
Combustion
- D.
Single Replacement
- E.
Double Replacement
- 14.
What type of reaction is this?
- A.
Synthesis
- B.
Decomposition
- C.
Combustion
- D.
Single Replacement
- E.
Double Replacement
- 15.
After 400 seconds of this experiment there is less small chips remaining than there is large chips. This demonstrates _____________ effect on reaction rate
- A.
Temperature
- B.
Surface Area
- C.
Pressure
- D.
Using a Catalyst
- 16.
At a higher concentration the recation rate is faster and form a greater amount of ___________ in a shorter period of time
- A.
Products
- B.
Reagents (this means reactants)
- 17.
In order to increase the reaction rate you can increase all of the following EXCEPT.....
- A.
Temperature
- B.
Concentration
- C.
Pressure
- D.
Surface Area
- 18.
Using what you know about how temperature affects reaction rateswhat is the temperature of the middle beaker?
- A.
Colder than the other twobeakers
- B.
Hotter than the other two beakers
- 19.
Using what we learned about reaction rates how could you get alka seltzer to dissolve the fastest so you could get the medicine in your body the fastest
- A.
Use a whole tablet in cold water
- B.
Use a crushed tablet in room temperature water
- C.
Use a crushed tablet in warm water
- D.
Use a whole tablet in warm water
- 20.
If you put a whole tablet of alka seltzer in the same temperature water at the beach in florida and also on top of a mountain in colorado which one would dissolve first?
- A.
Florida
- B.
Colorado
- 21.Activation energy is the energy needed to get a reaction started. Usually, this is the heat energy of the reactants. If something has a high activation energy, then it is hard to get the reaction to happen unless the temperature is high. If the bond between A-A or B-B is very strong, then the activation energy for the reaction will be
- A.
High
- B.
Low
- C.
The bond strength will not affect the activation energy
- 22.
Would it still be safe drink the milk if you increased the temperature
- A.
Yes....as long as the milk flavor did not start to decrease
- B.
No...it needs to stay this cold
- 23.
If I could not increase the temperature how else could I get these bonds to break?
- A.
Increase the pressure
- B.
Increase the concentration
- C.
Add a catalyst
- D.
Decrease the temperature
- 24.
Is the formation of product AB likely to occur?
- A.
Yes because the bond strength of AB is strong
- B.
No because the bond strength of the reactants is strong but the strength of the product bond is weak
- C.
Not enough information
- D.
Yes because the bond strength of reactants and products is the same
- 25.Choose the correct reaction below: One molecule of A2 and one of B2 (the reactants), chemically react to form 2 molecules of AB (the products).
- A.
A + A --> A2
- B.
AB --> A + B
- C.
A2 + B2 --> 2AB
- D.
2AB --> A2 + B2
Related Topics
Featured Quizzes
Back to top