Changes in Matter Unit Test 10 of 1310 of 13 Items Question If you dissolve 20 mL of flavor crystals into 250 mL of water to make lemonade, what volume of lemonade do you expect to have? Why?(1 point) You would expect to have 270 mL of lemonade. The total volume is the sum of 20 mL of flavor crystals and 250 mL of water. You would expect to have 270 mL of lemonade. The total volume is the sum of 20 mL of flavor crystals and 250 mL of water. You would expect to have 230 mL of lemonade. The total volume of lemonade will be less than the starting volume of water. Dissolving the flavor crystals reduces the amount of matter. You would expect to have 230 mL of lemonade. The total volume of lemonade will be less than the starting volume of water. Dissolving the flavor crystals reduces the amount of matter. You would expect to have about 250 mL of lemonade. There is empty space between water molecules. The flavor crystals fill in the empty spaces rather than increasing the total amount of space taken up by the solution. You would expect to have about 250 mL of lemonade. There is empty space between water molecules. The flavor crystals fill in the empty spaces rather than increasing the total amount of space taken up by the solution. You would expect to have 270 mL of lemonade. The total volume of lemonade does not change at all. There is empty space between water molecules. The flavor crystals fill in the empty spaces, rather than increasing the total amount of space taken up by the solution.

Tafari worked one summer on a ship that set weather buoys in the ocean. he watched how one of the buoys moved in the water. describe which parts of the wave would cause the buoy to bob up and down. which wave property determined how fast the buoys bobbed in the water? he observed that when the wind blew harder, the ocean waves were larger, and the buoys moved away from the ship. what effect, if any, did the waves have on how far the buoys moved? explain your answer.

19. explain why a magnet from your refrigerator could not be used to lift something as heavy as a car. (chapter 7 – pages 202-203) 20. can a magnet ever have a single pole? explain your answer. (chapter 7 – page 208) 21. what happens to the wavelength of a wave if the frequency is increased? (chapter 9 – pages 280-281) 22. an ocean wave has a wavelength of 10 m and a frequency of 4.0 hz. what is the velocity of the wave? show the appropriate equation from your book and show your work with units. (chapter 9 – page 282) 23. as you sit outside, the sound of a siren becomes lower in pitch. is the emergency vehicle moving away from or towards you? explain how you know. (chapter 10 – page 315-316) 24. why are two astronauts in space unable to hear one another? (chapter 10 – page 307) 25. explain in at least 3 sentences how electromagnetic waves form. (chapter 11 – page 338-339) 26. using the chart on page 345 in your textbook, what are the three types of electromagnetic wave with wavelengths shorter than those of visible light. give an example of each. (chapter 11 – pages 345-351) 27. explain why a leaf usually appears to be green, but a rose typically appears red. (chapter 12 – page 373) 28. what is the difference in light that is refracted compared to light that is reflected? think in terms of speed of light as well as what happens to light waves when they interact with a medium. (chapter 12 – pages 369-370) 29. how are concave and convex lenses different? (chapter 13 – page 408-410) 30. what type of mirror is used in rearview mirrors in cars? why is it important that these mirrors have the warning, “objects in mirror are closer than they appear.”? (chapter 13 – page 405)

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?