if you start with 48 g of a radioactive substance and have 0.75 g left how many half lives have elapsed

How many grams are in 23.0 moles of carbon (C) ?

What are the two different types of ocean currents, and how are they formed?

00 ml of a 0.30 m hcl solution is titrated with 0.35 m naoh. what is the ph of the solution after 40.00 ml of the naoh has been added?

5. Which is an example of inertia? a. The baseball sailed through the air and then fell to the ground. b. I The truck driver pressed on the brakes and the truck slowed down. C.

Which of the following choices is an example of a nonvascular plant? A. Moss B. Grass C. Trees D. Flowers

Two clear solutions are placed in separate beakers. The first solution has a pH of 4, and the pH of the second solution is unknown. If the two solutions are mixed and the resulting pH is 5, the second solution must have

Based on its location on the periodic table, which element (s) have properties similar to N? Choose all that apply. * P C O Bi

What conclusion can be drawn from the statement that an element has low electron affinity, low electronegativity, and a low ionization energy?

A scientist performs an experiment in which a radium-226 (Ra-226) atom decays into radon-222 (Rn-222). The scientist concludes that some energy must have been added to the system to cause this reaction to begin.

Which suitable method can be used to separate a mixture of sand and paraffin