Lanthanum-138 has a half-life of 105 billion years. After 525 billion years, how much of a 240 g sample of this radioisotope will remain?

nevermind, I got 7.5g and was right

How is the periodic table used to predict the properties of an element?

Explain what happens to substances during a chemical change

Which of the following only takes into account distance and time? Question 18 options: displacement velocity speed acceleration

How can human activity can impact an organism's ability to obtain the resources it needs to survive

14. The flight will arrive A. By B. on D. at C. with

What mass of potassium chlorate would contain 40grams of oxygen?

Identical forces act for the same length of time on two different masses. The change in momentum of the smaller mass is A) smaller than the change in momentum of the larger mass, but not zero. B) zero.

How many nuclei of 238 92 U 92 238 U remain in a rock if the activity registers 290 decays per second? (Note that the half life of Uranium-238 is 4.468x109 years)

A base can neutralize an acid. true or false

Hydrochloric acid (12.0 ml of 0.233 m) is added to 296.0 ml of 0.0579 m ba (oh) 2 solution. what is the concentration of the excess h + or oh - ions left in this solution?