Samarium-146 has a half-life of 103.5 million years. After 1.035 billion years, how much samarium-146 will remain from a 205-g sample?

0.200 g

0.400 g

20.5 g

103 g

This Actinide Series element has twice the electrons as silver.

How many grams of NaNO3 will precipitate if a saturated solution of NaNO3 in 200 g of water at 50°C is cooled to 20oC? Assume the following solubility values for NaNO3: 114.0g/100g H2O at 50oC; 88.0g/100g H2O at 20oC

Use VSEPR to predict the geometry (including bond angles) about each interior atom of methyl azide (CH3N3), and make a sketch of the molecule. Would you expect the bond angle between the two interior nitrogen atoms to be the same or different

Which of the following is true for organisms that have two identical alleles for a particular trait? A They are hybrids. B They are homozygous. C They are heterozygous. D They are dominant.

How many times more basic is a solution with a pH of 10 than a solution with a pH of 8 a. A pH of 10 is two times as basic b. A pH of 8 is two times as basic c. A pH of 10 is 2,000 times as basic d. A pH of 8 is 20 times as basic e.

What is the name of the compound Sr3N2?

The water softener discussed here relies on precipitation softening also known as ion exchange. based o hte reactants used, what ions would remain in the softened water thaat would be consumed buy the homeowners

What would be the best technique to separate a soluble solid from a solution, like separating salt from a mixture of salt water?

What are metalloids used for

Which scientist developed the quantum mechanical model of the atom? a. Albert Einstein c. Niels Bohr b. Erwin Schrodinger d. Ernest Rutherford