Chemistry Unit Review

True or False, the following chemical equation is balanced

 $2H_2O\rightarrow2H_2+O_2$  

• True 

• False

If two substances interact with each other and form a single third substance, which is the major product

• whichever has the highest density

• both of the original substances

• the new substance

• it can't be known without more information

in the following chemical equation what are the reactants

 $2H_2O_2\rightarrow\ 2H_2O\ +O_2$  

• H2O

• O2

• H2O2

• there is no reactant

If heat is added to sugar it will undergo a chemical reaction and form a new substance, caramel, what other substance must the sugar be reacting with?

(a)  

Is density a chemical property or a physical property

• chemical

• physical

is flammability a chemical property or a physical property?

• chemical

• physical

True or False, a chemical reaction must involve a change in some chemical property?

• True

• False

True or False, all chemical properties must change in a chemical reaction

• True

• False

If heat is added to steel wool it will turn into a dark grey/black color and start glowing orange and emitting fire, is steel wool flammable?

• Yes, if it catches fire its flammable

• No, the substance it turns into is flammable not the Steel Wool