Frank says, “It must be the bubbles that make the raisin rise.” Joyce asks, “OK, but then why do they sink again?”

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Frank says, “It must be the bubbles that make the raisin rise.” Joyce asks, “OK, but then why do they sink again?”

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These questions are designed to be considered by groups of students in class. Often these questions work well for introducing a particular topic in class.
As stated in the text, there is no one scientific method. However, making observations, formulating hypotheses, and performing experiments are generally components of “doing science.” Read the following passage, and list any observations, hypotheses, and experiments. Support your answer. Joyce and Frank are eating raisins and drinking ginger ale. Frank accidentally drops a raisin into his ginger ale. They both notice that the raisin falls to the bottom of the glass. Soon, the raisin rises to the surface of the ginger ale, then sinks. Within a couple of minutes, it rises and sinks again. Joyce asks, “I wonder why that happened?” Frank says, “I don’t know, but let’s see if it works in water.” Joyce fills a glass with water and drops the raisin into the glass. After a few minutes, Frank says, “No, it doesn’t go up and down in the water.” Joyce closely observes the raisins in the two glasses and states, “Look, there are bubbles on the raisins in the ginger ale but not on the raisins in the water.” Frank says, “It must be the bubbles that make the raisin rise.” Joyce asks, “OK, but then why do they sink again?”

Answer & ExplanationSolution by a verified expert5 Studiers

Explanation
Science deals with the study and analysis of different types of information. In order to resolve a scientific problem, the facts related to the problem are identified and studied. Whatever information is gathered from the recognition of the problem is called observation. In science, this step is called creating an observation. Suitable and possible explanations are stated in light of the observation. The set of possible explanations is termed hypotheses. In science, this step is renowned for stating different hypotheses. Out of all the possible hypotheses, the one that successfully explains the different types of observations is converted into a theory or model. This step requires a sequence of actions to be performed in order to prove the authenticity of the explanation. These actions are collectively referred to as experiments. In science, this step is called generating a model by performing experiments. The entire procedure from making observations to formulating theories is referred to as a scientific method. Just like experiments are performed to validate the theories in science, daily problems and tasks can be resolved and simplified for better understanding by performing experiments.

Certain observations, hypotheses, and experiments in the given case are illustrated as follows:

Observation: The rise of the raisin in the ginger drink but not in water.

Hypothesis: The gas bubbles present in the ginger drink but not in water are responsible for the upward motion of the raisins.

Experiment: Take one glass of water and one glass of ginger drink. Drop a raisin in both glasses.

The raisin begins to move upward in the ginger drink but does not rise in water. The upward movement of the raisin in the ginger drink is the change noticed in the surrounding area. All the information associated with this change is referred to as observation. The given ginger drink is a carbonated drink that contains carbon dioxide (CO2) gas while water contains negligible traces of it. Sequentially, a possible reason behind the movement of the raisin in the ginger drink is proposed. The CO2 gas forms bubbles that adhere to the surface of the raisin and lift it upward. This proposed possibility is considered a hypothesis. The raisin is dissolved in two different drinks to check the consistency of the hypothesis with the results. This activity is called an experiment.

Observation: The raisin sinks again in the ginger drink.

Hypothesis: The gas bubbles disappear as the raisin reaches the surface of the ginger drink and the raisin sinks down.

Experiment: Drop the raisin in the ginger drink a few minutes after the addition of the drink to the glass.

The raisin moves upward and then moves down again after reaching the surface of the ginger drink. Since the downward movement of the raisin is the change noticed in the drink, it is considered to be an observation. The gas bubbles escape from the drink into the air, which leads to a possible explanation for the sinking of the raisin. This cycle keeps repeating as long as the entire CO2 gas does not escape the drink. This possible explanation is defined as a hypothesis. The movement of the raisin is recorded periodically. This activity is categorized as an experiment.

Sample Response
The observations, hypotheses, and experiments are listed as follows:

Observation: The raisin rises in the ginger drink but not in water.

Hypothesis: Gas bubbles present in the ginger drink but not in water cause the upward movement of raisin.

Experiment: Drop a raisin in a glass of water and a glass of ginger drink.

Raisin rises in ginger drink and stays immersed in water. The change or observation made is the upward rise of the raisin. Ginger drink is an aerated drink, and the chief component of an aerated drink is carbon dioxide gas (CO2). This gas forms bubbles that get attached to the raisin and push it upward. This is the proposed hypothesis. Consequently, the setup and the activity performed in the respect of this hypothesis are used to prove the authenticity of the explanation.

Observation: Sinking of raisin after reaching upward in the ginger drink.

Hypothesis: Disappearance of gas bubbles

Experiment: The raisin is added to the ginger drink. The raisin rises upward and consecutively sinks down, and the cycle keeps repeating.

The change or observation made is the upward rise of the raisin. The gas bubbles leave the drink and diffuse into the air. The raisin sinks in the absence of any support. The process keeps recurring as long as the entire CO2 gas is not consumed in the process. This is the proposed elaboration or hypothesis. The periodic movement of the raisin is recorded as part of the experimental work to check the consistency of the proposal.

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