The half-life of radioactive element krypton-91 is 10 seconds. if 16 grams of krypton-91 are initially present, how many grams are present after 10 seconds? after 50 seconds?

What is the best name for this molecule? explain your naming process. a hydrocarbon compound with a total of 9 carbons that includes one double bond and the rest single bonds. there are 6 carbons a?

Which of the following atoms: P, I, Mg, Cl, In, Cs, O, Pb, Co would be expected to form negative or positive ions?

Which statement describes one acid-base theory? (1) An acid is an H + acceptor, and a base is an H + donor. (2) An acid is an H + donor,. and a base is an H + acceptor. (3) An acid is an H - acceptor, and a base is an H-donor.

4. Is the ketone oxidized or reduced during this reaction and how can you tell? OH i- mes a Neither. This is not an oxidation-reduction reaction. h The ketone is both oxidized and reduced because this is an oxidation- reduction reaction. c.

A can of soda has 35 mg of sodium in it. how many grams of sodium is this?

The reaction of glucose, c6h12o6, with oxygen produces carbon dioxide and water. what is the sum of the coefficients in the balanced equation?

alexadra has a density of 3.72g/mL. and a mass of 11160 mg. If the object is placed in a graduated cylinder containing 25 mL of water. What is the final volume?

How should she report the answer using the correct number of significant figures? 14.206 14.21 14.2 14

Find the mass in 2.6 mol of lithium bromide. (Hint: You need to write the formula)

Which of the following would NOT be a conversion factor for mole to mole calculations for the following reaction: 2Al 3Cl2 - -> 2AlCl3?