Chemical Reactions

Which is an example of a physical property

• hardness
• ability to react with metals

A change in matter that produces new substances is called a

• chemical reaction
• physical change

A chemical reaction in which energy is absorbed is called

• synthetic
• endothermic

Chemical equations must be balanced because chemical reactions obey the principle of 

• Conservation of mass
• decomposition

In a chemical equation, the number in front of a chemical formula that tells how many atoms take  part in the the reaction is called a

• concentration
• coefficient 

When two or more substances combine to make a more complex substance, the process is called

• replacement
• synthesis 

In an exothermic reaction, the products have ...where the energy/heat leaves

• less energy than the reactants
• more energy than the reactants

Most inhibitors work by

• preventing the reactants from coming together
• increasing the surface are of reactants

Which provides the activation ENERGY to start a fire

• oxygen
• heat

Which cannot be used to put out a small fire, t

• water
• oxygen
• baking soda