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- 8. What happens to the temperature while water is in the process of freezing? a. The temperature continues to decrease while freezing occurs. b. The temperature continues to increase while freezing occurs. c. The temperature stays constant while freezing occurs. The removal of energy is used to form bonds between the water molecules. 9. Does the temperature change while phase changes are occurring? Why or why not? a. Yes. The energy is used to decrease the temperature. b. No. The energy is used to break the bonds (overcome intermolecular forces) to cause a phase change. c. Yes. The energy is not used to break the bonds of a solid. d. Yes. The energy is used to boil the substance. 10. How is temperature related to the motion of molecules? a. The molecules move faster with an increase in temperature. b. The molecules move slower with an increase in temperature. c. Temperature is not related to the motion of molecules 11. How do the molecules in the liquid interact with the molecules in the solid? a. The molecules in the liquid do not interact with the molecules in the solid. b. A phase change occurs, but not due to an interaction with the liquid and solid water molecules. c. The collisions of the liquid water molecules transfers energy by direct contact (conduction) to the solid ice. This overcomes the intermolecular forces (breaks bonds) and causes the phase change of melting to occur. d. None of the above.
- 5. A 4768-kg roller coaster train full of riders approaches the loading dock at a speed of 17.1m/s It is that acts upon the roller coaster cars. abruptly decelerated to speed of 2.2m/s over a distance of 13.6 m Determine the retarding force
- Wrap Up: Answer the following questions. For reasons not yot fully understood by scientists.thundorstorm clouds have a strong soparation of charge, with a negative charge concentrated on the lower lovel of the clouds and a positive chargo concentrated in the upper lovel of the clouds. a. What is tho sign of the charge that is induced on the ground bolow? b. Electrons are pulled off when the electric field is strong enough to rip air molecules apart, leaving positivoly charged ions In which direction (up or down) do the electrons travel? c. In which diroction do the positive ions travol? d. The electrons and ions crash through the surrounding air with great energy, producing a sudden increase in the temperature of the air.The air expands very quickly, producing a flash of light and a loud boom. What are those called?
- DIRECTIONS: CIRCLE THE BEST ANSWER CHOICE BAGED ON THE PAGSAGE. 1. Which of the following best describes why the nuclear test systems were disabled? a. There was an unplanned power surge that disabled them b. There was an explosion that disabled the test systems c. The engineers disabled the test systems on purpose d. There were no test systems installed 2. Which best describes a nuclear fallout? a. radioactive particles explode from the ground b. radioactive particles get forced into the atmosphere.then settle into the ground c. radioactive particles fall from the atmosphere from an unknown source d. nuclear power plants have a financial crisis 3. Invisible energy that is given off from a radioactive element, such as Uranium.describes __ a. radiation b. nuclear fallout c. nuclear power plant d. chemotherapy 4. Just after the accident, the Soviet Union. __ a. Made a worldwide public announcement b. Made an announcement to surrounding countries c. Asked other countries to send help d. Tried to keep the accident a secret 5. Which is considered a long-term effect from the accident? a. cancer b. asthma c. pneumonia d. both b and C 6. The text says that many people died "directly and indirectly" from the accident. Which BEST describes those who died DIRECTLY from the accident? a. Firefighters who were part of the rescue teams after the explosion b. Citizens who have died from cancer from exposure to radiation c. Trees that have died from exposure to radiation d. Scientists who died during the explosion
- 25. What is Half-life? ) The amount of time it takes for half the nuclei in a sample of the isotope to decay The amount of time it takes for some of the nuclei in a sample of the isotope to decay The amount of time it takes for half the electrons in a sample of the isotope to decay the amount of time it takes to double the nuclei in a sample of the isotope to decay
