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Fill in the blanks to complete the sentences. Not all answer choices will be used.

During a chemical reaction, the atoms in
are rearranged to form
. Although the number and type of atoms remain the same, the
between them change.

2
Classify the statements according to the part of a chemical reaction they describe.

Choose answers from the answer bank to place in the table. Use the arrow keys to select an answer and press space when you're ready to drag it to a new location. Then use the arrow keys to move the answer to a response area and press space to drop it. You may add more than one answer to a blank space.
Reactants

Products

3
As cookies bake, several chemical reactions occur. Most of these reactions are endothermic. What does this mean?

A
They release more energy than they absorb

B
They absorb more energy than they release

C
They do not release any energy when new bonds form

D
They require less energy than exothermic reactions
4
This graph shows how surrounding temperature changes before and after a chemical reaction between acid and salt. Use the graph to fill in the blanks to complete the sentence. Not all answer choices will be used.

A line graph showing temperature over time. The temperature remains constant at 25 degrees Celsius for the first 2 minutes, then sharply increases to 55 degrees Celsius over the next minute. The temperature then gradually decreases over the next 6 minutes to about 48 degrees Celsius.
Because the temperature
, this chemical reaction can be classified as
.

5
What happens to the energy that is absorbed during an endothermic reaction?

A
It is stored in the chemical bonds of the products

B
It is used up like the reactants in a chemical reaction

C
It is released, causing an increase in temperature

D
It is used to break chemical bonds of the products
6
This diagram shows the amount of energy stored in the reactants and products of an exothermic chemical reaction. Because energy was released, the products have less stored energy than the reactants. Which of these diagrams shows the energy change in an endothermic reaction?

A line graph showing the change in stored energy over time for a chemical reaction. The reactants have a relatively low level of stored energy. A red arrow shows that energy is added to the reactants, causing the energy level to rise to a peak. This peak is called the activation energy. The energy level then drops as the reaction proceeds, shown by an orange arrow. The products have a lower level of energy than the reactants, indicated by a horizontal line labeled "products." The x-axis represents time and the y-axis represents stored energy.

A
A line graph with a single blue line that starts flat, rises to a peak, and then falls to another flat line.

B
A line graph with a single blue line that is completely flat, positioned midway up the y-axis.

C
A line graph showing a steady increase in values, a peak, and then a plateau.

D
A line graph with an x-axis and y-axis, showing a curved line that starts at a high value, decreases, and levels off. The line represents a decrease over time that stabilizes.

1 answer

Here is the completion of the sentences and the responses to your questions:

  1. During a chemical reaction, the atoms in reactants are rearranged to form products. Although the number and type of atoms remain the same, the bonds between them change.

  2. Reactants | Products

    • The substances that undergo change in a chemical reaction
    • The new substances formed as a result of a chemical reaction

  3. As cookies bake, several chemical reactions occur. Most of these reactions are endothermic. What does this mean?
    B They absorb more energy than they release.

  4. Because the temperature increases, this chemical reaction can be classified as exothermic.

  5. What happens to the energy that is absorbed during an endothermic reaction?
    A It is stored in the chemical bonds of the products.

  6. The correct option that shows the energy change in an endothermic reaction is:
    A A line graph with a single blue line that starts flat, rises to a peak, and then falls to another flat line.

Feel free to ask if you have any further questions or need additional assistance!