AP Thermochemistry

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

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

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.MS-PS1-2

NGSS.MS-PS3-4

NGSS.MS-PS3-5

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.MS-PS1-4

NGSS.MS-PS3-5

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.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

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.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-5

The reaction of calcium chloride and water in the hot pack

tindak balas antara kalsium klorida dengan air dalam pek panas

(a)  

• releases water/ membebaskan air

• releases heat/ membebaskan haba

• absorbs water/ menyerap air

• absorbs heat/ menyerap haba

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5

Diagram shows reaction between sodium and water. The reaction is

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Cake baking is

• endothermic

• exothermic

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Dissolving ammonium salt in water will cause a ___________ in temperature

• increase

• higher

• drop

• constant

Tags

NGSS.MS-PS1-4

Energy level diagram for endothermic reaction

• •The energy of the products is higher than the energy of the reactants.

• •The energy of the products is lower than the energy of the reactants.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4