10. the potential energy of an object held ab...
10. the potential energy of an object held above the ground depends on its mass, gravity, and its:\na. speed b. color c. temperature d. height\n11. which of the following represents a physical change?\na. iron rusting b. wood burning c. ice melting d. milk souring\n12. energy stored in the chemical bonds of gasoline is best classified as:\na. thermal b. nuclear c. chemical d. electrical\n13. an instrument commonly used to measure mass in grams is a:\na. thermometer b. graduated cylinder c. triple - beam balance d. voltmeter\n14. the gaseous layer that surrounds earth and drives weather is called the:\na. lithosphere b. atmosphere c. hydrosphere d. biosphere\n15. which type of engineer designs bridges and buildings to withstand earthquakes?\na. chemical engineer b. civil engineer c. electrical engineer d. biomedical engineer\n\ntrue / false (1 pt each)\n16. a solution is always a heterogeneous mixture.\n17. kinetic energy increases as the speed of an object increases.\n18. the biosphere includes all living organisms on earth.\n19. boiling water is an example of a chemical change.\n20. hurricanes form over warm ocean water.\n\nfill - in - the - blank (1 pt each)\n21. the smallest unit of an element that retains its identity is an \n22. a mixture whose particles settle out over time is called a \n23. heat transfer by direct particle - to - particle contact is called
Answer
# Brief Explanations:
10. The potential - energy formula for an object above the ground is $PE = mgh$ where $m$ is mass, $g$ is gravity, and $h$ is height. So it depends on height.
11. A physical change is a change in the state or form of a substance without changing its chemical composition. Ice melting is a physical change as it changes from solid to liquid without a chemical reaction.
12. Energy stored in chemical bonds is chemical energy. Gasoline has chemical energy stored in its bonds.
13. A triple - beam balance is used to measure mass in grams.
14. The atmosphere is the gaseous layer that surrounds Earth and drives weather.
15. Civil engineers design bridges and buildings to withstand earthquakes.
16. A solution is a homogeneous mixture, not heterogeneous.
17. Kinetic energy is given by $KE=\frac{1}{2}mv^{2}$, so it increases as speed increases.
18. The biosphere includes all living organisms on Earth.
19. Boiling water is a physical change as it changes from liquid to gas without a chemical reaction.
20. Hurricanes form over warm ocean water.
21. The smallest unit of an element that retains its identity is an atom.
22. A mixture whose particles settle out over time is called a suspension.
23. Heat transfer by direct particle - to - particle contact is called conduction.
# Answer:
10. D. Height
11. C. Ice melting
12. C. Chemical
13. C. Triple - beam balance
14. B. Atmosphere
15. B. Civil engineer
16. False
17. True
18. True
19. False
20. True
21. atom
22. suspension
23. conduction