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Under the collision theory, the particles must collide with  ____ and ____ for a reaction to occur.

• sufficient rate and sufficient energy
• sufficient surface area and correct orientation
• sufficient catalyst and sufficient energy
• sufficent energy and correct orientation

More collisions correspond to a: 

• Faster reaction rate  
• Slower reaction rate
• Constant reaction rate 
• None of the above

Which of the following is NOT a factor affecting reaction rate?

• temperature

• catalysts

• concentration

• polarity

Which of the following increase the reaction rate?

• less surface area
• lower temperature
• an inhibitor
• increased concentration

In an exothermic reaction, heat is ...

• absorbed

• released

In an endothermic reaction, heat is ,,,

• absorbed

• released

Do the reactants in an exothermic reaction have a higher or lower energy than the products?

• Higher

• Lower

Do reactants in an endothermic reaction have a higher or lower energy than the products?

• Higher

• Lower

What is activation energy?

• The maximum amount of energy used

• The minimum amount of energy required for a reaction to start

• The energy of the reactants

• The energy possessed by the products

Which state of matter will react the SLOWEST?

• solid

• liquid

• gas

• the all react at the same rate