4th Quarter Science

What happens to the density of a gas as its volume decreases at constant pressure and temperature?

• a. decreases                  

•   b. increases   

• c. stays the same  

• d. unpredictable

What gas law explains the relationship among the volume, pressure, temperature and the number of moles of gases?

                         

• a.    Boyle’s Law 

•   b. Combined Gas Law   

• c. Charles’s Law 

• d. Ideal Gas Law

What determines an atom’s ability to undergo chemical reactions?

                               

• a.    Protons

• b. neutrons   

• c. innermost electrons  

• d. outermost electrons

  A chemical reaction is process in which

                      

            

• a.    All reactants change state

• b.    Products change into reactants 

•   c. the law of conservation of mass applies

•    d. all of these

During a chemical reaction,

                             

                          

• a.    Atoms are destroyed   

• b.    Atoms are rearranged  

• c. elements are destroyed

•    d. new elements are produced

Quicklime (CaO) is used as a drying agent. When water is added to this, slaked lime Ca(OH)₂ is formed. What type of reaction is this?

                                        

                         

• a.    Combination 

• b.    Single displacement      

•     c. decomposition

•    d. double displacement

A reaction when one or more reactants combine to form a single product

                                        

                          

• a. Combination      

• b.Single displacement          

• c. double displacement

• d. combustion

This is when oxygen combines with a hydrocarbon (compound containing hydrogen and carbon) to form water and carbon dioxide.

                                      

                                       

• a.    decomposition  

• b.    combination      

•   c. double displacement

• d. combustion

This is a special kind of double displacement reaction that takes place when an acid and base react with each other

                              

                                

• a.    Single displacement   

• b.    Acid-Base reaction   

• c.  combustion

• d. combination

This refers to the minimum amount of energy required for collision to happen

                                

                                    

• a.    Kinetic energy          

• b.    Potential energy   

• c. activation energy

• d. action potential energy