Here are the answers to your questions based on scientific principles and lab safety practices:
Question 8: What is the main difference between a hypothesis and a theory in scientific research?
- Answer: A hypothesis is a tentative explanation that can be tested by experiments while a theory is a well-substantiated explanation based on a body of evidence.
Question 9: Which of the following is a limitation of science?
- Answer: Science cannot address supernatural phenomena or questions of moral and ethical values.
Question 10: Which of the following is a crucial lab safety practice?
- Answer: Wearing appropriate personal protective equipment (PPE) at all times.
Question 11: Which of the following is an important safety procedure for scientists working in a natural environment?
- Answer: Wearing appropriate clothing and protective gear suited for the specific environment.
Question 12: Why is the Safety Data Sheet (SDS) important in a laboratory setting?
- Answer: It contains detailed information on the properties, hazard, safe handling, and emergency measures related to chemicals used in the lab.
Question 13: Which of the following hypotheses is the best for this scenario?
- Answer: 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.
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?
- Answer: A digital balance.
Question 15: In a scientific experiment, what is the dependent variable?
- Answer: The factor that is measured or observed to obtain results.
Question 16: In a scientific experiment, what is the independent variable?
- Answer: The factor that is deliberately changed or manipulated by the researcher.
Question 17: What is the difference between the following 2 statements?
- Answer: 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?
- Answer: Observations of objects floating upwards without any external force.
Question 19: What part of the scientific method is most likely to lead to changes in a theory?
- Answer: Results.
Question 20: 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 that should the students follow to prevent injuries?
- Answer:
- Always wear appropriate personal protective equipment (PPE) such as goggles and lab coats.
- Ensure that long hair is tied back and loose clothing is secured to prevent catching fire.
- Never leave the Bunsen burner unattended while it is lit, and make sure to turn it off when finished.
- Keep flammable materials away from the flame and work in a well-ventilated area.
Feel free to ask if you need further clarifications or information!