Introduction to Thermochemistry

What is meant by HEAT OF REACTION?

• Energy change in a chemical reaction

• Energy absorbed in a chemical reaction

• Energy released in a chemical reaction

• Energy required in a chemical reaction

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

What is the sign of ΔH for endothermic reaction?

• positive

• negative

Tags

NGSS.HS-PS1-4

Based on the diagram, Heat energy is ___________ to the surrounding.

• releases

• absorbs

Tags

NGSS.HS-PS1-4

Based on the diagram, which of the following is true?

• The reaction is endothermic

• Thermometer reading increases

• The heat energy is absorbed from surrounding

Tags

NGSS.HS-PS1-4

The reaction between calcium nitrate solution and sodium carbonate solution is endothermic. Which of the following represents this reaction?

• 
• 

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

Based on the diagram, total energy content of the products is _________ than total energy of the reactants.

• less

• more

Tags

NGSS.HS-PS1-4

During a chemical reaction, chemical bonds of the reactants are __________ and new bonds in the products are ___________.

• formed, broken

• broken, formed

• formed, formed

• broken, broken

Tags

NGSS.HS-PS1-7

This reaction is an ______________ reaction.

• endothermic

• exothermic

Tags

NGSS.HS-PS1-4

What is the value of x?

• +270 kJ

• +200 kJ

• –130 kJ

• +130 kJ

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

What is the type the reaction and the activation energy?

• Exothermic, 30 kJ

• Exothermic, 70 kJ

• Endothermic, 30 kJ

• Endothermic, 70 kJ

Tags

NGSS.HS-PS1-4