Energy Level Diagrams

What are valence electrons?

• electrons in the second orbit/energy level

• electrons in the outermost orbit/energy level

• the atomic number

• electrons in the first orbit/ energy level

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

A Texas Gulf Coast energy pyramid is shown with representative organisms at each trophic level. Which statement best describes the flow of energy through this pyramid?

• The trophic level represented by catfish and gobies receives

  energy directly from the producers.

• The trophic level represented by shrimp and copepods receives

  energy directly from the tertiary consumers.

• The trophic level represented by redfish and flounder receives

  energy directly from the secondary consumers.

• The trophic level represented by wire grass and phytoplankton

  receives energy directly from the primary consumers.

Tags

NGSS.MS-LS2-3

How many valence electrons?

• 2

• 3

• 5

• 10

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

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.HS-PS1-4

In an energy level diagram, what does the vertical axis typically represent?

• Time

• Energy

• Distance

• Mass

Which of the following statements is true for an exothermic reaction in an energy level diagram?

• 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.

• The energy of the products is equal to the energy of the reactants.

• The energy of the reactants is zero.

Tags

NGSS.HS-PS3-4

In an energy level diagram, what does a higher position of a level indicate?

• Lower energy

• Higher energy

• Equal energy

• No energy

What is the significance of the activation energy in an energy level diagram?

• It represents the total energy of the system.

• It is the energy required to start a reaction.

• It is the energy released during the reaction.

• It is the energy of the products.

In a chemical reaction, if the energy level of the products is lower than that of the reactants, what type of reaction is it?

• Endothermic

• Exothermic

• Isothermal

• Adiabatic

Tags

NGSS.HS-PS1-4

Which part of the energy level diagram represents the transition state?

• The lowest point

• The highest point

• The starting point

• The ending point