Demo Assessment: Energy in a Chemical Reaction

Posljednje ažuriranje over 6 years ago

Napomena autora:

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

Demo Assessment: Energy in a Chemical Reaction

Posljednje ažuriranje over 6 years ago

Napomena autora:

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?

Endothermic and Exothermic because there are multiple molecules in the reactants which broke down and formed new bonds creating different molecules in the product.

Endothermic because the reactant started off as one molecule which was broken down into two separate molecules and breaking bonds is endothermic since it requires energy to be absorbed.

Exothermic because the reactant started off as one molecule which was broken down into two separate molecules and breaking bonds requires energy to be absorbed in order to do so.

Exothermic because the reactants had to form more bonds to create multiple molecules which releases energy.

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?