Question

During a chemical reaction, the number of atoms(1 point) Responses decreases. increases. stays the same. fluctuates.

Answer 1

Which of the following processes takes place in the cytoplasm?(1 point) Responses Photosynthesis Photosynthesis Aerobic cellular respiration Aerobic cellular respiration The Kreb's Cycle The Kreb's Cycle Anaerobic cellular respiration

Answer 2

An organism is sealed in a chamber. Scientists measure the amount of carbon dioxide and oxygen in the chamber. In 3–5 sentences, explain how they can use the volumes of these gases to determine if photosynthesis or cellular respiration is occurring in in the chamber. (4 points)

Answer 3

An ice pack is cracked, starting a reaction. The ice pack decreases in temperature as the reaction absorbs heat energy from the environment. The temperature of the surroundings decreases as heat is absorbed by the ice pack. Is this process exothermic or endothermic? Explain your reasoning in 3-5 sentences.(4 points)

Answer 4

During a chemical reaction, the number of atoms stays the same. The atoms are rearranged to form new substances, but the total number of atoms before and after the reaction remains constant, in accordance with the law of conservation of mass.

Answer 5

Among the processes listed, anaerobic cellular respiration takes place in the cytoplasm.

- Photosynthesis occurs in the chloroplasts of plant cells.
- Aerobic cellular respiration primarily occurs in the mitochondria.
- The Kreb's Cycle (also known as the citric acid cycle) occurs in the mitochondria as well.

So, the correct response is **Anaerobic cellular respiration**.

Answer 6

Scientists can determine whether photosynthesis or cellular respiration is occurring in the sealed chamber by measuring the volumes of carbon dioxide (CO2) and oxygen (O2). During photosynthesis, plants absorb CO2 and release O2, resulting in a decrease in CO2 levels and an increase in O2 levels. Conversely, during cellular respiration, organisms consume O2 and produce CO2, leading to a decrease in O2 levels and an increase in CO2 levels. By analyzing the changes in the gas volumes over time, scientists can determine which process is dominating; a rise in O2 and a drop in CO2 would indicate photosynthesis, while a drop in O2 and a rise in CO2 would suggest cellular respiration.

Answer 7

The process described is endothermic. In an endothermic reaction, the system absorbs heat energy from its surroundings, leading to a decrease in the temperature of the surroundings. In this case, the ice pack absorbs heat energy, causing the temperature of the ice pack to decrease while simultaneously lowering the temperature of the surrounding environment. This energy absorption indicates that the reaction inside the ice pack requires heat to proceed, which is characteristic of endothermic processes.