Question

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1. after testing a prototype, the boat sinks when carrying marbles. what should engineers do next? a) stop the project and pick a new problem b) throw the boat away and never try again c) use what they learned to improve the boat design d) add more marbles to test its strength 2. which design change would most likely make a vessel more stable? a) make the hull wider b) make the sides shorter c) use a heavier material d) reduce the amount of water in the tank 3. why is it important to test a prototype under different water conditions (like waves or longer distances)? a) to make the boat look more realistic b) to see if the vessel still works when conditions change c) to make the test more fun d) to waste time and slow the process 4. what is the last step in the engineering - design process? a) build and test a prototype b) define the problem c) improve the design based on results d) brainstorm multiple solutions p.s.8.8.1 obtain and evaluate scientific information to describe what happens to the properties of substances in mixtures and solutions. 1. when salt is mixed with water, what happens to the salt? a) it changes into a gas b) it keeps its solid shape and floats c) it dissolves and becomes part of the solution d) it disappears and no longer exists 2. which of these is a mixture but not a solution? a) lemonade b) sand and iron filings c) salt water d) vinegar 3. in a solution, the substance that dissolves is called the: a) solvent b) solute c) mixture d) compound 4. when sugar is mixed into tea, which property of the sugar stays the same?

Explanation:

1. After testing a prototype, engineers should use what they learned to improve the design, so the answer to the first engineering - related question is C. Making the base wider makes a vessel more stable, so for the second engineering question the answer is A. Testing a prototype under different water conditions is to see if the vessel still works when conditions change, so the answer to the third engineering question is B. The last step in the engineering design process is to improve the design based on results, so the answer to the fourth engineering question is C.
2. When salt is mixed with water, it dissolves and becomes part of the solution, so the answer to the first mixtures - and - solutions question is C. Sand and iron filings is a mixture but not a solution, so the answer to the second mixtures - and - solutions question is B. In a solution, the substance that dissolves is called the solute, so the answer to the third mixtures - and - solutions question is B. When sugar is mixed into tea, its chemical composition stays the same, although its physical state may change.

Answer:

1. C. Use what they learned to improve the boat design
2. A. Make the base wider
3. B. To see if the vessel still works when conditions change
4. C. Improve the design based on results
5. C. It dissolves and becomes part of the solution
6. B. Sand and iron filings
7. B. Solute
8. Chemical composition (not explicitly given as an option, but conceptually correct; if we assume based on the nature of sugar in a mixture, its chemical identity remains the same)