Unit Test — Unit test Answers

Because of the costs involved in maintaining high temperatures and pressure, nuclear _______ is not yet a practical method for generating electrical energy.Which best completes the statement?

This chart show the amount of radioactivity measured from three unknown isotopes.Which statement describes each of the isotopes?

How does the Sun release nuclear energy?

The equation for photosynthesis is 6H2O (water) + 6CO2 (carbon dioxide) + Light Energy → C6H12O6 (glucose) + 6O2 (oxygen). When first discovered, scientists were trying to decide if the oxygen in the product came from carbon dioxide or water. Which statement describes how scientists traced the path of oxygen?

Which is the best location for storing radioactive wastes?

Nuclear energy is currently used in which three kinds of vehicles?

Which best describes a radioactive isotope?

What was Antoine Henri Becquerel studying when he discovered radioactivity?

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Which feature of nuclear fission reactions allows these reactions to take place in a chain reaction?

Elemental carbon has 6 protons and 6 neutrons. This is often described as carbon-12. Carbon-13 has 6 protons and 7 neutrons, while carbon-14 has 6 protons and 8 neutrons. Based on the trend with carbon and the fact that plutonium has 94 protons, how many neutrons are in radioactive plutonium-244?

Juliet started working with a radioactive substance. In 1997, she started with 200 g. When she measured again in 2002, she had 100 g left. In 2007, she had 50 g.

Manganese-52 has a half-life of 6 days. How many days would a scientist have to wait for the radioactivity to be 12.5% the starting amount?

The starting amount of radioactive iodine-131 was 250 g. The half-life is 8 days. When Leslie measured the amount, she measured 15.625 g of radioactive iodine. How many days have elapsed between measurements?

Carbon-14 is the typical radioisotope used to date materials; however, it has a limitation to 40,000 years. A scientist who wants to date materials older than 40,000 years would most likely use which radioisotope?

What was the commonality between Becquerel and the Curies in terms of their work?

Which element is the primary fuel used to generate electricity using nuclear energy?

The image shows a process that releases nuclear energy.

Improvements in which area would help reduce the possibility of damage to the environment when using uranium as a fuel?

What is the main reason why many nuclear power plants are located near bodies of water?