Chp 19 Chemical Reactions Review

What is a chemical reaction?

• process where substances stay the same
• process where ONLY one substance is changed into different substances
• process where one or more substances are changed into one or more different substances
• process where ONLY one substance stays the same

In any chemical reaction, what are the original substances?

• reactants
• products
• coefficients
• moles

In any chemical reaction, what are the resulting substances?

• reactants
• products
• coefficients
• moles

A student mixes vinegar and baking soda, and carbon dioxide is formed. Which are the reactants?

• carbon dioxide
• carbon dioxide and baking soda
• vinegar and carbon dioxide
• vinegar and baking soda

A student mixes vinegar and baking soda, and carbon dioxide is formed. Which are the products?

• carbon dioxide
• carbon dioxide and baking soda
• vinegar and carbon dioxide
• vinegar and baking soda

Which of the following may indicate that a chemical reaction has occurred?

• release of energy as light
• color change
• gas bubble formation
• all of the above

What is a precipitate?

• liquid that separates from solution in a chemical reaction
• solid that separates from solution in a chemical reaction
• gas that separates from solution in a chemical reaction
• whenever it rains, sleets, or snows

How many types of chemical reactions are there?

• 2
• 3
• 4
• 5

In which kind of reaction do two or more substances combine to form a new compound?

• synthesis
• combustion
• decomposition
• single displacement

The reaction 2 H₂+ O₂ → 2 H₂O is a

• double-displacement reaction

• synthesis reaction

• decomposition reaction

• combustion reaction