Which of the following best describes an EXOTHERMIC reaction?

• Overall, Energy is absorbed from the surroundings

• Overall, energy is released into the surroundings

• No energy change occurs
• Overall, Energy is stored in the reactants

Tags

NGSS.HS-PS1-4

Which of the following best describes an ENDOTHERMIC reaction?

• Overall, Energy is absorbed from the surroundings

• Overall, energy is released into the surroundings

• No energy change occurs
• Overall, Energy is stored in the reactants

Tags

NGSS.HS-PS1-4

How do you know if a reaction is exothermic based on bond energies?

• More energy is absorbed than released
• More energy is released than absorbed
• Energy absorbed equals energy released
• Energy is neither absorbed nor released

Tags

NGSS.HS-PS1-4

How do you know if a reaction is ENDOTHERMIC based on bond energies?

• More energy is absorbed than released
• More energy is released than absorbed
• Energy absorbed equals energy released
• Energy is neither absorbed nor released

Tags

NGSS.HS-PS1-4

What happens to energy when bonds form?

• Energy is absorbed
• Energy is released
• No energy change
• Energy is stored

Tags

NGSS.HS-PS1-4

When bonds break during a chemical reaction, what happens to energy?

• Energy is absorbed
• Energy is released
• Energy remains constant
• Energy is converted to mass

Tags

NGSS.HS-PS1-4

In an exothermic reaction, what happens to the energy in relation to the system and surroundings?

• Energy is absorbed by the system from the surroundings
• Energy is released from the system to the surroundings
• Energy remains constant within the system
• Energy is converted to matter

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

Which of the following is true about bond formation in a chemical reaction?

• It always absorbs energy
• It always releases energy
• It may either absorb or release energy depending on the specific bonds
• It has no effect on energy

Tags

NGSS.HS-PS1-4

In the reaction Na₂S + 2HCl → 2NaCl + H₂S, if the overall energy change is +6 kJ, what can we conclude?

• The reaction is exothermic
• The reaction is endothermic
• The reaction is in equilibrium
• The reaction is impossible

Tags

NGSS.HS-PS1-4

In the reaction 2NaCl + H₂S → Na₂S + 2HCl, if the overall energy change is -330 kJ, what can we conclude?

• The reaction is exothermic
• The reaction is endothermic
• The reaction is in equilibrium
• The reaction is impossible

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4