Signs of Chemical Reactions

Front

What is a sign of a chemical reaction?

Back

A new substance has formed.

Front

What type of reaction is represented by the equation @@2NaCl + H_2SO_4 ightarrow Na_2SO_4 + 2HCl@@?

Back

Double displacement.

Front

Which of the following is evidence of a chemical reaction? A) Zinc settles in water B) Ice melts C) Sugar burns and turns black D) Tomato is chopped

Back

C) Sugar that is burned gives off an odor and turns brown and then black.

Front

What type of reaction is represented by the equation @@2Li + 2H_2O ightarrow 2LiOH + H_2@@?

Back

Single displacement.

Front

What type of reaction involves energy being transferred from the surroundings to the reactants?

Back

Endothermic.

Front

What is a chemical reaction?

Back

A process that leads to the transformation of one set of chemical substances to another.

Front

What is an exothermic reaction?

Back

A reaction that releases energy in the form of heat.

Front

What is a synthesis reaction?

Back

A reaction where two or more substances combine to form a new compound.

Front

What is a decomposition reaction?

Back

A reaction where a single compound breaks down into two or more simpler products.

Front

What is a combustion reaction?

Back

A reaction that involves the burning of a substance in the presence of oxygen, producing heat and light.