Why is the Safety Data Sheet (SDS) important in a laboratory setting?(1 point)

Question

Responses

It provides entertainment for lab personnel during breaks.
It provides entertainment for lab personnel during breaks.

It serves as a record of experiments conducted in the lab.
It serves as a record of experiments conducted in the lab.

It contains detailed information on the properties, hazard, safe handling and emergency measures related to chemicals used in the lab.
It contains detailed information on the properties, hazard, safe handling and emergency measures related to chemicals used in the lab.

It lists the names of all personnel who have worked with a particular chemical.
It lists the names of all personnel who have worked with a particular chemical.
Question 13
Which of the following hypotheses is the best for this scenario?
"In a high school science lab, a group of students is conducting an experiment to determine the amount of water needed to grow a seed into a fully mature plant. The students are investigating the effect of varying water amounts on the growth and development of bean plants."(1 point)
Responses

Bean plants will grow best when they receive the least amount of water, as this will encourage them to develop deeper roots and seek out water.
Bean plants will grow best when they receive the least amount of water, as this will encourage them to develop deeper roots and seek out water.

Bean plants will grow best when receiving a moderate amount of water, and excessive or insufficient water will result in stunted growth or plant mortality.
Bean plants will grow best when receiving a moderate amount of water, and excessive or insufficient water will result in stunted growth or plant mortality.

Bean plants will grow best when they receive the most amount of water, as this will provide them with more nutrients and encourage faster growth.
Bean plants will grow best when they receive the most amount of water, as this will provide them with more nutrients and encourage faster growth.

The amount of water has no effect on the growth and development of bean plants; all plants will grow equally well regardless of the water amount.
The amount of water has no effect on the growth and development of bean plants; all plants will grow equally well regardless of the water amount.
Question 14
A team of scientists at a research laboratory is conducting a study on the effects of different concentrations of a drug on bacterial growth. They need to accurately measure and prepare precise concentrations of the drug solution for their experiments. Which of the following tools will be needed?(1 point)
Responses

A water bath
A water bath

A data collection probe
A data collection probe

A thermometer
A thermometer

A digital balance
A digital balance
Question 15
In a scientific experiment, what is the dependent variable?(1 point)
Responses

The factor that is deliberately changed or manipulated by the research to observe its effect.
The factor that is deliberately changed or manipulated by the research to observe its effect.

The factor that remains unaffected by other variables in the experiment.
The factor that remains unaffected by other variables in the experiment.

The factor that is kept constant throughout the experiment.
The factor that is kept constant throughout the experiment.

The factor that is measured or observed to obtain results.
The factor that is measured or observed to obtain results.
Question 16
In a scientific experiment, what is the independent variable?(1 point)
Responses

The factor that is measured or observed to determine the effect of the independent variable.
The factor that is measured or observed to determine the effect of the independent variable.

The factor that is deliberately changed or manipulated by the researcher.
The factor that is deliberately changed or manipulated by the researcher.

The factor that remains unaffected by other variables in the experiment.
The factor that remains unaffected by other variables in the experiment.

The factor that is kept constant throughout the experiment.
The factor that is kept constant throughout the experiment.
Question 17
What is the difference between the following 2 statements?

Statement A: The finches on the Galapagos Islands, which have different beak shapes adapted to their specific diets, exemplify how species can evolve distinct traits in response to their environment.

Statement B: The gravitational attraction between the Earth and an apple, which causes the apple to fall from a tree to the ground, is expressed by Sir Isaac Newton's description of the gravitational force between two objects.

(1 point)
Responses

Statement A is a law and Statement B is a theory.
Statement A is a law and Statement B is a theory.

Both statements are scientific laws.
Both statements are scientific laws.

Both statements are scientific theories.
Both statements are scientific theories.

Statement A is a theory and Statement B is a law.
Statement A is a theory and Statement B is a law.
Question 18
What evidence would have been needed to contradict the theory of gravity before it was proven to be a law?(1 point)
Responses

Experiments demonstrating that objects of different masses fall at different rates in a vacuum.
Experiments demonstrating that objects of different masses fall at different rates in a vacuum.

Observations of objects floating upwards without any external force.
Observations of objects floating upwards without any external force.

Discovery of a force stronger than gravity that acts universally on all matter.
Discovery of a force stronger than gravity that acts universally on all matter.

Consistent measurements showing that the gravitational constant varies significantly on Earth.
Consistent measurements showing that the gravitational constant varies significantly on Earth.
Question 19
What part of the scientific method is most likely to lead to changes in a theory?(1 point)
Responses

Problem
Problem

Hypothesis
Hypothesis

Results
Results

Methods
Methods
Question 20

Answer 1

Here are the answers to your questions:

1. Why is the Safety Data Sheet (SDS) important in a laboratory setting?

   • It contains detailed information on the properties, hazard, safe handling and emergency measures related to chemicals used in the lab.

2. Which of the following hypotheses is the best for this scenario?

   • Bean plants will grow best when receiving a moderate amount of water, and excessive or insufficient water will result in stunted growth or plant mortality.

3. A team of scientists at a research laboratory is conducting a study on the effects of different concentrations of a drug on bacterial growth. They need to accurately measure and prepare precise concentrations of the drug solution for their experiments. Which of the following tools will be needed?

   • A digital balance.

4. In a scientific experiment, what is the dependent variable?

   • The factor that is measured or observed to obtain results.

5. In a scientific experiment, what is the independent variable?

   • The factor that is deliberately changed or manipulated by the researcher.

6. What is the difference between the following 2 statements?

   • Statement A is a theory and Statement B is a law.

7. What evidence would have been needed to contradict the theory of gravity before it was proven to be a law?

   • Observations of objects floating upwards without any external force.

8. What part of the scientific method is most likely to lead to changes in a theory?

   • Results.

If you need further clarification or additional information about any of these topics, feel free to ask!