AP Chemistry Thermochemistry

The reaction of calcium chloride and water in the hot pack tindak balas antara kalsium klorida dengan air dalam pek panas

• releases water/ membebaskan air

• releases heat/ membebaskan haba

• absorbs water/ menyerap air

• absorbs heat/ menyerap haba

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

A positive ΔH means that:

• In order for the reaction to happen, heat must be input. It is exothermic

• In order for the reaction to happen, heat must be input. It is endothermic.

• When the reaction happens, heat is released. It is exothermic

• When the reaction happens, heat is released. It is endothermic

Tags

NGSS.HS-PS3-1

If the enthalpy ter (ΔH) is negative the reaction is ____.

• Endothermic

• Exothermic

• Neutral

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

What type of reaction is this?

• Exothermic

• Endothermic

• Kinetic

• Potential

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

ΔH means:

• temperature

• calorimetry

• enthalpy

• syntropy

A reaction is performed in a beaker with a temperature probe recording the temperature changes of the reaction.  If the temperature began at 15.0 degrees Celsius and ended at 27.5 degrees Celsius.  If the reaction is our system, is the system endothermic or exothermic?

• Exothermic

• Endothermic

When sodium hydroxide is added to hydrochloric acid, the temperature reading on the thermometer is ______________ and the reaction name is __________________

• decreasing

• increasing

• constant

• neutralisation

• titration

Tags

NGSS.HS-PS1-5

NGSS.HS-PS3-4

when a piece of magnesium ribbon is added to some dilute hydrochloric acid in a test tube, a reaction occurs and the test tube becomes hot. the type of reaction is.....

• exothermic reaction

• endothermic reaction

Tags

NGSS.HS-PS1-4

Which statement is correct about exothermic reaction?

• The heat absorbed during bond breaking is more than the heat released during bond formation

• The heat absorbed during bond breaking is less than the heat released during bond formation

• The heat absorbed during bond breaking is equal to the heat released during bond formation

• No heat is absorbed or released during bond breaking and bond formation

Tags

NGSS.HS-PS1-4

The reaction between nitrogen and oxygen can be represented by the following equation:

Which of the following energy level diagrams represent the above reaction?

• 
• 
• 
• 

Tags

NGSS.HS-PS1-4