A scientist is performing an experiment to determine the melting point of a new substance. Which action could increase the likelihood of obtaining accurate results?

Question

A scientist is performing an experiment to determine the melting point of a new substance. Which action could increase the likelihood of obtaining accurate results?

writing out the procedure after the experiment

using three types of thermometers in the experiment

repeating the experiment three times

experimenting with multiple substances

Answer 1

To increase the likelihood of obtaining accurate results in determining the melting point of a new substance, the best action would be:

repeating the experiment three times

Repeating the experiment helps to ensure that any anomalies or errors are identified and mitigated, leading to more reliable data on the melting point. This process allows for averaging the results and identifying any consistent trends or potential outliers.

Answer 2

Drug manufacturers must test their new products before they can be marketed. A pill containing a new drug was given to participants in Group A. A pill containing no drug was given to the same number of participants in Group B. In this test, the drug given to the participants in Group A was the

Answer 3

In this test, the drug given to the participants in Group A was the experimental group or treatment group. Group A is receiving the new drug to assess its effects, while Group B, receiving a pill containing no drug (commonly known as a placebo), serves as the control group. This setup allows researchers to compare the outcomes between the group receiving the treatment and the group not receiving it to evaluate the drug's efficacy and safety.

Answer 4

Drug manufacturers must test their new products before they can be marketed. A pill containing a new drug was given to participants in Group A. A pill containing no drug was given to the same number of participants in Group B. In this test, the drug given to the participants in Group A was the

independent variable

constant

control

dependent variable

Answer 5

In this test, the drug given to the participants in Group A was the independent variable.

The independent variable is the factor that is manipulated or changed by the researcher to observe its effects on the dependent variable, which in this case would be the outcomes measured in both Group A and Group B (such as health effects or symptom relief). Group B, receiving the placebo, acts as the control group.

Answer 6

A student wants to test the effect of music on plant growth. He grows some plants in a bedroom window with music playing twenty-four hours per day. He grows a different variety of plants in his backyard with no music playing. What is the main problem with the design of this investigation?

A student wants to test the effect of music on plant growth. He grows some plants in a bedroom window with music playing twenty-four hours per day. He grows a different variety of plants in his backyard with no music playing. What is the main problem with the design of this investigation?

There is no way to accurately measure results.

There are too many ways to graph the data.

There is no way to repeat the procedure.

There are too many variables.

Answer 7

The main problem with the design of this investigation is:

There are too many variables.

In this experiment, the student is not only varying the exposure to music but is also using different varieties of plants and different growing environments (bedroom window vs. backyard). These additional variables can confound the results, making it difficult to determine whether any differences in plant growth are due to the music or other factors associated with the different plant varieties or their growing conditions. To accurately test the effect of music on plant growth, the student should keep the plant variety and growing conditions consistent while varying only the music exposure.

Answer 8

A student has written the following hypothesis: As more salt is added to a container of ice, the temperature of the mixture will become lower. What are two factors that need to be kept constant to test this hypothesis?

A student has written the following hypothesis: As more salt is added to a container of ice, the temperature of the mixture will become lower. What are two factors that need to be kept constant to test this hypothesis?

size of container and amount of ice

type of salt and amount of ice

amount of salt and amount of ice

size of container and amount of time

Answer 9

To effectively test the hypothesis that "as more salt is added to a container of ice, the temperature of the mixture will become lower," the two factors that need to be kept constant are:

type of salt and amount of ice.

By keeping the type of salt constant, you ensure that the chemical properties of the salt do not influence the results. Keeping the amount of ice constant allows you to control the starting baseline temperature and the quantity of ice available to absorb heat. This helps ensure that any changes in temperature can be attributed to the amount of salt added rather than variations in the ice itself.

Answer 10

The dependent variable in this experiment is

The dependent variable in this experiment is

if candy is given as a reward

type of candy

how often you eat candy

average level of happiness

Answer 11

In this experiment, the dependent variable is:

average level of happiness.

The dependent variable is what you measure in the experiment, and it is expected to change in response to variations in the independent variable. In this case, the independent variable could be the type of candy or whether candy is given as a reward, while the average level of happiness is what you would measure to see if there is an effect from those changes.