Demo Assessment: Energy in a Chemical Reaction

Last updated about 6 years ago

10 questions

Note from the author:

Energy in Chemical Reactions using Polyurethane A + B as a demo and having students apply their learning to explain what is happening.

During chemical reactions the bonds between atoms break and new bonds form. Energy must be absorbed to break a bond, so breaking bonds is endothermic. Making new bonds is exothermic because energy is released.

Looking at the image above, what kind of reaction is occurring and how do you know?

Demo Assessment: Energy in a Chemical Reaction

Demo Assessment: Energy in a Chemical Reaction

During chemical reactions the bonds between atoms break and new bonds form. Energy must be absorbed to break a bond, so breaking bonds is endothermic. Making new bonds is exothermic because energy is released.

Looking at the image above, what kind of reaction is occurring and how do you know?

Observations of Poly. A before:

Observations of Poly. B before:

What evidence can be observed that a chemical reaction has occured? Select ALL that apply (4).

What type of a chemical reaction is this?

How do you know it's that type of a chemical reaction?

Using Arrows, show what is happening to the energy in this reaction (where it came from and where it's going).

The word energy should be placed in which part of this chemical equation?

Which of the statement below is true:

During one of our labs we combined ammonium chloride with water which resulted in a loss of thermal energy (heat). What kind of a reaction occurred?

During chemical reactions the bonds between atoms break and new bonds form. Energy must be absorbed to break a bond, so breaking bonds is endothermic. Making new bonds is exothermic because energy is released.

Looking at the image above, what kind of reaction is occurring and how do you know?

Observations of Poly. A before:

Observations of Poly. B before:

What evidence can be observed that a chemical reaction has occured? Select ALL that apply (4).

What type of a chemical reaction is this?

How do you know it's that type of a chemical reaction?

Using Arrows, show what is happening to the energy in this reaction (where it came from and where it's going).

The word energy should be placed in which part of this chemical equation?

Which of the statement below is true:

During one of our labs we combined ammonium chloride with water which resulted in a loss of thermal energy (heat). What kind of a reaction occurred?

Demo Assessment: Energy in a Chemical Reaction

Demo Assessment: Energy in a Chemical Reaction

During chemical reactions the bonds between atoms break and new bonds form. Energy must be absorbed to break a bond, so breaking bonds is endothermic. Making new bonds is exothermic because energy is released.Looking at the image above, what kind of reaction is occurring and how do you know?

Observations of Poly. A before:

Observations of Poly. B before:

What evidence can be observed that a chemical reaction has occured? Select ALL that apply (4).

What type of a chemical reaction is this?

How do you know it's that type of a chemical reaction?

Using Arrows, show what is happening to the energy in this reaction (where it came from and where it's going).

The word energy should be placed in which part of this chemical equation?

Which of the statement below is true:

During one of our labs we combined ammonium chloride with water which resulted in a loss of thermal energy (heat). What kind of a reaction occurred?

During chemical reactions the bonds between atoms break and new bonds form. Energy must be absorbed to break a bond, so breaking bonds is endothermic. Making new bonds is exothermic because energy is released.Looking at the image above, what kind of reaction is occurring and how do you know?

Observations of Poly. A before:

Observations of Poly. B before:

What evidence can be observed that a chemical reaction has occured? Select ALL that apply (4).

What type of a chemical reaction is this?

How do you know it's that type of a chemical reaction?

Using Arrows, show what is happening to the energy in this reaction (where it came from and where it's going).

The word energy should be placed in which part of this chemical equation?

Which of the statement below is true:

During one of our labs we combined ammonium chloride with water which resulted in a loss of thermal energy (heat). What kind of a reaction occurred?

During chemical reactions the bonds between atoms break and new bonds form. Energy must be absorbed to break a bond, so breaking bonds is endothermic. Making new bonds is exothermic because energy is released.

Looking at the image above, what kind of reaction is occurring and how do you know?

During chemical reactions the bonds between atoms break and new bonds form. Energy must be absorbed to break a bond, so breaking bonds is endothermic. Making new bonds is exothermic because energy is released.

Looking at the image above, what kind of reaction is occurring and how do you know?