Energy of Chemical Reactions

What type of reaction is shown in the photo?

• Exothermic

• Isothermic

• Endothermic

• None of the above

Tags

NGSS.HS-PS1-4

How would this reaction be classified?
2Na + Cl₂ → 2NaCl + 25kJ energy

• Exothermic
• Endothermic
• Isothermic
• None of the above

Tags

NGSS.HS-PS1-4

What is true of this reaction?

• Equal amounts of energy were released and absorbed
• The reaction released more energy than it absorbed
• The reaction absorbed more energy than it released

Tags

NGSS.HS-PS1-4

How does an exothermic reaction feel?

• cold
• warm
• You can't feel it
• None of the above

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

What tool is used to measure the amount of heat in a material?

• meter stick
• spring scale
• graduated cylinder
• thermometer

This is a measurement of the amount of heat in a material. 

• temperature
• degrees
• chemical equation
• exothermic reaction

What are the reactants in the chemical equation below?
Na+Cl₂ →  2NaCl

• Na and Cl
• Na only
• NaCl
• 2NaCl

What are the products in the chemical equation pictured?

• CO₂
• CO₂ and H₂O
• CH₄ and O₂
• O₂

What is the enthalpy (ΔH) of an exothermic reaction?

• +
• −

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

What is true of the reaction described below?
Br₂ + Cl₂ + 30.0 J of energy  → 2BrCl

• It is exothermic because energy was released.
• It is endothermic because energy is absorbed.
• It is exothermic because energy is absorbed.
• It is endothermic because energy is released.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4