Question

Which fuel does the circulation of blood provide for cellular respiration and healing?(1 point)
Responses

oxygen
oxygen

protein
protein

iron
iron

ATP
Answer
What are reactants in a chemical reaction?(1 point)
Responses

substances that are formed by reactions
substances that are formed by reactions

outputs
outputs

inputs
inputs

substances that speed up reactions
Answer
Use the scenario to answer the question.

A person lights a gas grill using a match. When the grill lid is open, the student sees the blue flame and can feel that heat is being released.

Is this an endothermic or exothermic reaction, and why?

(1 point)
Answer
Use the scenario to answer the question.

A person lights a gas grill using a match. When the grill lid is open, the student sees the blue flame and can feel that heat is being released.

Is this an endothermic or exothermic reaction, and why?

(1 point)
Responses

Endothermic, because it took lighting a match to cause the reaction.
Endothermic, because it took lighting a match to cause the reaction.

Exothermic, because light and heat were emitted.
Exothermic, because light and heat were emitted.

Endothermic, because light and heat were emitted.
Endothermic, because light and heat were emitted.

Exothermic, because it took activation energy to cause the reaction.
Answer
During a chemical reaction, the number of atoms(1 point)
Responses

decreases.
decreases.

fluctuates.
fluctuates.

increases.
increases.

stays the same.
Answer
A large portion of cellular respiration happens in the mitochondria. Large molecules are broken down into smaller molecules to provide energy sources for the body. For this reason, the mitochondria are known colloquially as the “powerhouses of the cell.” Which body organ could best be compared to the mitochondria?(1 point)
Responses

the heart
the heart

the brain
the brain

the lungs
the lungs

the stomach
Answered by GPT-4o mini
The correct response is **oxygen**. Blood circulation supplies oxygen to cells, which is essential for cellular respiration, a process that generates ATP (adenosine triphosphate), the energy currency of the cell, and supports healing.
Answered by GPT-4o mini
The correct response is **inputs**. Reactants are the substances that undergo a chemical change in a reaction and are considered the inputs.
Answered by GPT-4o mini
This is an **exothermic reaction** because heat is being released into the surroundings when the gas is ignited. In an exothermic reaction, energy typically in the form of heat is produced as a result of the reaction, which is observed in the blue flame and the heat felt by the person near the grill.
Answered by GPT-4o mini
The correct response is **Exothermic, because light and heat were emitted.** This accurately describes the process, as the reaction releases heat and light, characteristic of exothermic reactions.
Answered by GPT-4o mini
The correct response is **stays the same.** During a chemical reaction, the number of atoms is conserved; atoms are rearranged to form new substances, but no atoms are lost or created.
Answered by GPT-4o mini
The correct response is **the stomach**. The stomach is where large molecules, such as proteins and carbohydrates, are broken down into smaller molecules (nutrients) that the body can use for energy, similar to how the mitochondria break down molecules to provide energy for the cell.