4. A swimming team wants to select one of three fabrics for their new swimsuits Each fabric is made of a material The team decides to do the following experiment: They cut the same size pieces from each fabric and wet each piece with the same amount of They hang the pieces in the sunlight and they check every two minutes to see if any of the pieces are dry. What can the team find out about the different fabrics from doing just this experiment? A. If the amount of water affects how long it takes the pieces of fabric to dry. B. If the type of fabric affects how long it takes the pieces of fabric to dry. C. If the amount of water and the amount of light affect how long it takes the pieces of fabric to dry. D. If the type of fabric, the amount of water, and the amount of light affect how long it takes the pieces of fabric to dry. 5. In what ways is a model similar to the thing it represents? A. A model must be identical to the thing it in every way B. A model must be identical to the thing it represents in every way except that it can be made out of different materials. C. A model must be identical to the thing it represents in every way except that it can be a different size. D. A model can be different from the thing it represents in either its size or the materials it is made of. 6. Scientists share the results of their experiments with other scientists and expect them to try to find flaws in their data and experimental desigr 1. What is the purpose of doing this? A. It provides an easy way to find out which scientists are good at designing experiments. B. It makes it possible to award grant money for the best research projects. C. It helps scientists ; to improve their experiments and interpret their data accurately. D. It helps scientists to better at spotting mistakes. 7. Which of these best describes the basis on which new scientific ideas are accepted or rejected? A.Popular support B . Historical support C . Carefully collected and analyzed data D. Moral and ethical beliefs 8. The best method to separate paper clips from a mixture of salt and pennies is: A. Filtering B Evaporation C . Magnetism D Chromatography

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4. A swimming team wants to select one of three fabrics for their new swimsuits Each fabric is made of a material The team decides to do the following experiment: They cut the same size pieces from each fabric and wet each piece with the same amount of They hang the pieces in the sunlight and they check every two minutes to see if any of the pieces are dry. What can the team find out about the different fabrics from doing just this experiment? A. If the amount of water affects how long it takes the pieces of fabric to dry. B. If the type of fabric affects how long it takes the pieces of fabric to dry. C. If the amount of water and the amount of light affect how long it takes the pieces of fabric to dry. D. If the type of fabric, the amount of water, and the amount of light affect how long it takes the pieces of fabric to dry. 5. In what ways is a model similar to the thing it represents? A. A model must be identical to the thing it in every way B. A model must be identical to the thing it represents in every way except that it can be made out of different materials. C. A model must be identical to the thing it represents in every way except that it can be a different size. D. A model can be different from the thing it represents in either its size or the materials it is made of. 6. Scientists share the results of their experiments with other scientists and expect them to try to find flaws in their data and experimental desigr 1. What is the purpose of doing this? A. It provides an easy way to find out which scientists are good at designing experiments. B. It makes it possible to award grant money for the best research projects. C. It helps scientists ; to improve their experiments and interpret their data accurately. D. It helps scientists to better at spotting mistakes. 7. Which of these best describes the basis on which new scientific ideas are accepted or rejected? A.Popular support B . Historical support C . Carefully collected and analyzed data D. Moral and ethical beliefs 8. The best method to separate paper clips from a mixture of salt and pennies is: A. Filtering B Evaporation C . Magnetism D Chromatography

Answer 1

4.B 5.D 6.C 7.C 8.C

Answer 2

## Step 1For question 4, the experiment involves three different fabrics, all of which are wetted with the same amount of water and exposed to the same amount of sunlight. The experiment is designed to observe how long it takes for each fabric to dry. The experiment is controlled, meaning that all variables except for the type of fabric are kept constant. Therefore, the experiment is designed to test the effect of the type of fabric on the drying time.## Step 2For question 5, a model is a representation of a real-world object or system. While a model does not need to be identical to the object it represents, it should capture the essential features of the object. Therefore, a model can be different in size or the materials it is made of from the object it represents.## Step 3For question 6, the purpose of sharing results with other scientists is to allow for peer review. Peer review is a process where other experts in the field evaluate the work to ensure its validity, accuracy, and originality. This helps in improving the experiment and interpreting the data accurately.## Step 4For question 7, new scientific ideas are accepted or rejected based on empirical evidence. Empirical evidence is information that is obtained through observation or experimentation. It is not based on personal beliefs or popular support but on data that has been carefully collected and analyzed.## Step 5For question 8, to separate paper clips from a mixture of salt and pennies, the best method would be magnetism. This is because paper clips are made of a material that is attracted to magnets, while salt and pennies are not.

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