Chemical Reactions Quiz

What is a chemical reaction?

• A chemical reaction is a process that leads to the destruction of chemical substances.

• A chemical reaction is a process that leads to the formation of new elements.

• A chemical reaction is a process that leads to the separation of chemical substances.

• A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

Name the four main types of chemical reactions.

• oxidation, reduction, combustion, and precipitation

• acid-base, redox, combustion, and precipitation

• synthesis, decomposition, single displacement, and double displacement

• synthesis, decomposition, neutralization, and combustion

What is an endothermic reaction?

• An endothermic reaction is a chemical reaction that does not involve heat.

• An endothermic reaction is a chemical reaction that occurs at extremely high temperatures.

• An endothermic reaction is a chemical reaction that absorbs heat from its surroundings.

• An endothermic reaction is a chemical reaction that releases heat into its surroundings.

What is an exothermic reaction?

• An exothermic reaction is a chemical reaction that absorbs energy in the form of heat or light.

• An exothermic reaction is a chemical reaction that occurs at extremely low temperatures.

• An exothermic reaction is a chemical reaction that produces a solid precipitate.

• An exothermic reaction is a chemical reaction that releases energy in the form of heat or light.

Which type of chemical reaction involves the transfer of electrons?

• acid-base reaction

• redox reaction

• precipitation reaction

• combustion reaction

In which type of chemical reaction does a single compound break down into two or more simpler substances?

• Neutralization reaction

• Decomposition reaction

• Combustion reaction

• Synthesis reaction

What is the general equation for a combustion reaction?

• CxHy + O2 -> CO2 + H2O

• CxHy + O2 -> CO2 + H2O + CH4

• CxHy + O2 -> CO2 + H2O + SO2

• CxHy + O2 -> CO2 + H2O + N2

What is the difference between a physical change and a chemical change?

• A physical change can be reversed, whereas a chemical change cannot.

• A physical change only affects the appearance of a substance, whereas a chemical change affects its properties.

• A physical change involves a change in temperature, whereas a chemical change does not.

• The difference between a physical change and a chemical change is that a physical change does not involve a change in chemical composition, whereas a chemical change does.

Give an example of an endothermic reaction.

• The reaction between bleach and ammonia

• The reaction between baking soda and vinegar

• The reaction between hydrogen peroxide and potassium iodide

• The reaction between sodium and water

Give an example of an exothermic reaction.

• Photosynthesis

• Freezing of water

• Combustion of gasoline

• Burning of wood