Chemical Reactions and Equations

Why does the energy arrow go up in the reaction of ammonium nitrate and water?

• More energy was absorbed from the surroundings to break reactant bonds than was released by the formation of product bonds.

• More energy was released than absorbed, making the reaction exothermic.

• The reaction is exothermic and releases energy to the surroundings.

• The energy arrow goes up because the temperature of the solution decreases.

Tags

NGSS.HS-PS1-4

Endothermic or Exothermic?

Ice melting

• Endothermic

• Exothermic

• Isothermal

• Thermodynamic

Tags

NGSS.MS-PS1-4

Consider the reaction that transforms one hydrogen molecule to two hydrogen atoms: H₂ ⟶ H + H. How you would describe this energy change?

• Energy is released in this reaction, making it exothermic.

• Bonds are formed in this process, resulting in energy absorption.

• Energy is absorbed in this reaction, making it endothermic.

• No energy change occurs during this reaction.

Tags

NGSS.HS-PS1-4

What type of reaction is this?

Pb(NO₃)₂ + 2 KF --> PbF₂ + 2 KNO₃

• Single Replacement

• Double Replacement

• Combustion

• Synthesis

Tags

NGSS.MS-PS1-2

Consider the reaction that creates one hydrogen molecule from two hydrogen atoms: H + H ⟶ H₂ How you would describe this energy change?

• Energy is absorbed in this reaction.

• This is an endothermic process.

• Bonds form in this process, and energy is released.

• Energy remains constant during this reaction.

Tags

NGSS.HS-PS1-4

Endothermic or Exothermic?

More energy was released to the surroundings by the formation of product bonds than was absorbed to break reactant bonds.

• Energy is absorbed.

• Energy is released.

• The reaction is endothermic.

• The reaction is exothermic.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

What coefficients are needed to balance this equation? Na₂CO₃ + CaCl₂ ⟶ CaCO₃ + NaCl

• 1 before Na₂CO₃ and 1 before CaCl₂

• 1 before CaCO₃ and 1 before NaCl

• 1 before Na₂CO₃ and 2 before NaCl

• 2 before NaCl in the products

Tags

NGSS.MS-PS1-5

What type of reaction is this?

• double replacement reaction

• combination reaction

• single replacement reaction

• decomposition reaction

How would you refer to the molecules on the left and right hand side of the arrow in the reaction represented: H₂ + O₂ ⟶ H₂O?

• Reactants and Products

• Substrates and Catalysts

• Reagents and Byproducts

• Inputs and Outputs

Tags

NGSS.MS-PS1-5

What type of reaction is this? CH₄ + 2 O₂ --> CO₂ + 2 H₂O

• Combustion

• Synthesis

• Decomposition

• Single Replacement