Exploring Types of Chemical Changes

Which of the following is NOT a type of chemical reaction discussed in the introduction?

• Combustion

• Synthesis

• Decomposition

• Photosynthesis

What is the main characteristic of a synthesis reaction?

• Combining smaller molecules to form a larger one

• Exchanging ions between two compounds

• Releasing heat and light

• Breaking down a large molecule into smaller ones

Which of the following is an example of a synthesis reaction?

• Combustion of methane

• Fermentation

• Formation of rust

• Electrolysis of water

What is typically required to initiate a decomposition reaction?

• Light

• Electricity

• All of the above

• Heat

Which of the following is a common example of a decomposition reaction?

• Fermentation

• Combustion of hydrocarbons

• Photosynthesis

• Formation of salt

What are the products of a complete combustion reaction?

• Carbon dioxide and water

• Carbon monoxide and water

• Carbon dioxide and soot

• Carbon monoxide and soot

Which of the following is a sign of incomplete combustion?

• No heat

• Black smoke

• No smoke

• Clear flame

In a single displacement reaction, what happens?

• Two compounds exchange ions

• One element replaces another in a compound

• A compound breaks down into two elements

• Two elements combine to form a compound

Which of the following is an example of a double displacement reaction?

• Formation of water from hydrogen and oxygen

• Combustion of methane

• Fermentation of glucose

• Reaction between silver nitrate and sodium chloride

What is a key characteristic of an acid-base reaction?

• Formation of water

• Release of heat

• Production of gas

• Formation of a precipitate