How long does it take a 180g sample of Au-198 to decay to 1/8 its original mass *the half life of Au-198 is 2.69 days.

Which of the following best explains why the end of a spoon sticking out of a cup of hot water also gets hot? question 7 options: the heat from the hot water is conducted through the spoon handle the hot water heats the air surrounding the upper part of the spoon. the hot water causes a physical change in the spoon handle. the hot water causes a chemical reaction to take place in the spoon.

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

Non renewable resources like petroleum eventually