Why can scientists never prove a theory absolutely?(1 point)
Responses
Because new evidence or observations could potentially contradict or modify the theory
Because new evidence or observations could potentially contradict or modify the theory
Because scientific theories are just educated guesses and lack empirical support
Because scientific theories are just educated guesses and lack empirical support
Because scientific theories are constantly changing and cannot be relied upon
Because scientific theories are constantly changing and cannot be relied upon
Because scientific theories are based on untested hypotheses
29 answers
The correct response is:
Because new evidence or observations could potentially contradict or modify the theory.
Scientific theories are continually tested and can be refined or rejected based on new data or observations. This is a fundamental principle of the scientific method.
What is the main difference between a hypothesis and a theory in scientific research?(1 point)
Responses
A hypothesis is a tentative explanation that can be tested by experiments while a theory is well-substantiated explanation based on a body of evidence.
A hypothesis is a tentative explanation that can be tested by experiments while a theory is well-substantiated explanation based on a body of evidence.
A hypothesis can never be modified, whereas a theory is subject to change with new evidence.
A hypothesis can never be modified, whereas a theory is subject to change with new evidence.
A hypothesis is a general principle that explains a wide range of phenomena, while a theory is a specific prediction about the outcome of an experiment.
A hypothesis is a general principle that explains a wide range of phenomena, while a theory is a specific prediction about the outcome of an experiment.
A hypothesis is a well-substantiated explanation of natural phenomena, while a theory is an educated guess that needs to be tested.
The correct response is:
A hypothesis is a tentative explanation that can be tested by experiments while a theory is well-substantiated explanation based on a body of evidence.
This accurately captures the distinction between a hypothesis and a theory in scientific research. A hypothesis is a starting point that can be tested, while a theory has been tested extensively and is supported by a significant amount of evidence.
Which of the following is a limitation of science?(1 point)
Responses
Science cannot address supernatural phenomena or questions of moral and ethical values.
Science cannot address supernatural phenomena or questions of moral and ethical values.
Science relies solely on subjective opinions and personal beliefs.
Science relies solely on subjective opinions and personal beliefs.
Science can provide definitive answers to all questions about the natural world.
Science can provide definitive answers to all questions about the natural world.
Science can predict every future event with absolute certainty.
The correct response is:
Science cannot address supernatural phenomena or questions of moral and ethical values.
This acknowledges that science is limited to studying the natural world and empirical evidence, and it does not deal with supernatural beliefs or moral and ethical questions, which are often subjective and philosophical in nature.
Which of the following is a crucial lab safety practice?(1 point)
Responses
Wearing appropriate personal protective equipment (PPE) at all times.
Wearing appropriate personal protective equipment (PPE) at all times.
Eating and drinking in the laboratory to maintain energy levels.
Eating and drinking in the laboratory to maintain energy levels.
Disposing of chemical in any sink to ensure quick cleanup.
Disposing of chemical in any sink to ensure quick cleanup.
Ignoring safety data sheets since they are not important.
The correct response is:
Wearing appropriate personal protective equipment (PPE) at all times.
This is a fundamental lab safety practice that helps protect individuals from potential hazards in the laboratory environment.
Which of the following is an important safety procedure for scientists working in a natural environment?(1 point)
Responses
Avoiding the use of any safety equipment to reduce the weight of their gear.
Avoiding the use of any safety equipment to reduce the weight of their gear.
Working alone to minimize the impact on the environment.
Working alone to minimize the impact on the environment.
Ignoring weather forecasts since natural conditions are unpredictable.
Ignoring weather forecasts since natural conditions are unpredictable.
Wearing appropriate clothing and protective gear suited for the specific environment.
The correct response is:
Wearing appropriate clothing and protective gear suited for the specific environment.
This is crucial for ensuring the safety and well-being of scientists while they conduct their work in natural environments, as it helps protect against various environmental hazards.
Why is the Safety Data Sheet (SDS) important in a laboratory setting?(1 point)
Responses
It provides entertainment for lab personnel during breaks.
It provides entertainment for lab personnel during breaks.
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 serves as a record of experiments conducted in the lab.
It serves as a record of experiments conducted in the lab.
It lists the names of all personnel who have worked with a particular chemical
The correct response is:
It contains detailed information on the properties, hazard, safe handling and emergency measures related to chemicals used in the lab.
Safety Data Sheets (SDS) are crucial for ensuring that personnel understand how to safely handle chemicals and what to do in case of an emergency, thereby promoting safety in the laboratory.
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 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.
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.
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.
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.
The best hypothesis for this scenario is:
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.
This hypothesis is specific, testable, and acknowledges the potential effects of both too much and too little water on plant growth, making it suitable for the experiment the students are conducting.
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 digital balance
A digital balance
A data collection probe
A data collection probe
A water bath
A water bath
A thermometer
The correct response for accurately measuring and preparing precise concentrations of the drug solution is:
A digital balance.
A digital balance is essential for measuring the mass of the drug accurately, which is necessary for preparing precise concentrations of the solution.
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 is measured or observed to obtain results.
The factor that is measured or observed to obtain results.
The factor that is kept constant throughout the experiment.
The factor that is kept constant throughout the experiment.
The factor that remains unaffected by other variables in the experiment.
The correct response is:
The factor that is measured or observed to obtain results.
In an experiment, the dependent variable is the outcome that researchers are trying to measure, which changes in response to manipulations of the independent variable.
In a scientific experiment, what is the independent variable?(1 point)
Responses
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 is kept constant throughout the experiment.
The factor that is kept constant throughout the experiment.
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 remains unaffected by other variables in the experiment.
The correct response is:
The factor that is deliberately changed or manipulated by the researcher.
In an experiment, the independent variable is the one that the researcher alters to observe its effect on the dependent variable.
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
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.
Both statements are scientific laws.
Both statements are scientific laws.
Statement A is a law and Statement B is a theory.
The correct response is:
Statement A is a theory and Statement B is a law.
Statement A describes the concept of evolution and how species adapt, which is a theory in biological science. Statement B describes the specific phenomenon of gravitational attraction as outlined by Newton's law of universal gravitation, which is a scientific law.
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.
The correct response is:
Observations of objects floating upwards without any external force.
Such observations would contradict the theory of gravity, which states that objects are attracted towards each other by gravitational force. If objects consistently floated upwards on their own without any external force, it would challenge the fundamental principles of gravitational attraction.
What part of the scientific method is most likely to lead to changes in a theory?(1 point)
Responses
Hypothesis
Hypothesis
Results
Results
Problem
Problem
Methods
The correct response is:
Results.
The results of experiments or observations can provide new evidence that may support, refine, or contradict a theory. When new data is collected that challenges existing theories, it can lead to changes in those theories to account for the new findings.
In science class, a group of students were using a Bunsen burner to do a flame test on various chemicals. List at least three safety precautions should the students follow to prevent injuries?(1 point)
When using a Bunsen burner in a science class, students should follow these safety precautions to prevent injuries:
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Wear Personal Protective Equipment (PPE): Students should wear safety goggles, lab coats, and heat-resistant gloves to protect their eyes, skin, and clothing from heat and potential splashes.
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Maintain a Safe Distance: Students should keep flammable materials (e.g., paper, chemicals, or clothing) away from the flame and maintain a safe distance from the Bunsen burner while it is in use.
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Use Proper Handling Techniques: Students should handle the Bunsen burner and glassware carefully, ensuring that they use appropriate tools (like tongs) when working with hot equipment, and always light the burner with a striker instead of matches.
Following these precautions will help ensure a safe laboratory environment while conducting experiments.
Here are three concise safety precautions for using a Bunsen burner:
- Wear PPE: Always wear safety goggles and lab coats.
- Keep Flammables Away: Ensure that flammable materials are distanced from the flame.
- Use Appropriate Tools: Light the burner with a striker and use tongs for hot equipment.
1 answer