The half-life of carbon-14 is 5730 years. Explain how to figure out the age of a substance that has 25% carbon-14 remaining.

Fred went to the doctor because his body was not producing semen. Which part of Fred's body was most likely functioning incorrectly to cause this problem. scrotum glands urinary bladder penis?

Which of the following describes the distribution of sodium and potassium between cells and body fluids?

Why do phase changes occur?

Compare the stability of a lithium atom with that of its ion, Li+.

What are chemical contaminants? Homemade soaps Restaurant grade cleaners Alcohol Recreational drugs

Atom with mass number of 31 and 16 neutrons what is the atomic number

In which medium will a sound wave move more quickly

Which of the following is best revealed by the bohr model? a. electrons are found only within the nucleus of an atom. b. protons orbit the nucleus of an atom in fixed proton shells. c. neutrons orbit the nucleus of an atom in fixed neutron shells. d.

A scientist wants to predict the weather which sphere should he study?

What structural formula represents 4 electrons shared between two atoms A. 0=0 B. S8 C. P4 D. N=N