More Unit 5 Chemistry Review

During bond formation energy is_______

• absorbed

• released

• constant

Which statement is true for the reaction: O + O --> O₂

• A bond is broken and energy is released

• A bond is broken and energy is absorbed

• A bond is formed and energy is released

• A bond is formed and energy is absorbed

Which statement is true in regards to the following equation: AB--> A + B

• A bond is formed and energy is released

• A bond is formed and energy is absorbed

• A bond is broken and energy is released

• A bond is broken and energy is absorbed

Bond formation between two atoms is generally

• Exothermic, which absorbs energy

• Exothermic, which releases energy

• Endothermic, which absorbs energy

• Endothermic, which releases energy

What occurs when the reaction takes place?

2HCl --> H₂ + Cl ₂

• H-Cl bonds are forming and H-H bonds are breaking.

• H-Cl bonds are breaking and H-H bonds are forming

• H-Cl bonds are forming and Cl-Cl bonds are forming.

• H-H bonds are breaking and H-Cl are forming

In an exothermic reaction, heat is ...

• taken in
• given out

Is the combustion of gasoline endothermic or exothermic?

• Endothermic
• Exothermic

During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______. 

• Warm
• Cold

Have you ever eaten sherbet sweets candy? They fizz in your mouth and your tongue feels cold. Why do you think that is?

• It is an exothermic reaction
• It is an endothermic reaction
• It is made of ice
• It is dissolving your mouth

Which of the following process is exothermic?

• Candle wax melting

• A puddle evaporating

• Dry ice (solid carbon dioxide) subliming to form gaseous carbon dioxide

• Water freezing to form ice