Examine the false statement. scientists can directly observe the half-life of all radioactive elements. what option rewords the statement so that it is true? select all that apply. scientists can calculate the rate of nuclear decay for all radioactive elements using half-life. scientists can calculate the half-life of all radioactive elements using the rate of nuclear decay. scientists cannot directly observe or calculate the rate of nuclear decay for all radioactive elements. scientists can directly observe the rate of nuclear decay for all radioactive elements.

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.

Match each scenario to the form of energy it represents

What is the mass of the water that is being heated? it requires 2,500 joules to raise a certain amount of water (c = 4.186 jig c) from 20.0°c to 60.0°c. o 159 o 40 g o 63 g o 80 g