Which pair represents isotopes?

a. All of the other answers are correct

b. Oxygen-16 and oxygen-18

c. Uranium-235 and uranium-238

d. 238U and 235U

e. A carbon atom with 6 neutrons and a carbon atom with 8 neutrons

What three qualities of titanium make it a good material for producing hip or knee replacements

How many elements occur naturally on earth?

What is the mass of 6.02 x 10^23 atoms of arsenic?

Balance each of the following redox reactions occurring in acidic aqueous solution. Part A Zn (s) + Sn2 + (aq) →Zn2 + (aq) + Sn (s) Express your answer as a chemical equation. Identify all of the phases in your answer.

What is the next step in the sun's life cycle after it has used up its hydrogen fuel. A. Nebula B. Super Giant C. Red Giant D. Supernova

How do you go from moles to atoms

Write conversion factors (as ratios) for the number of: (a) kilometers in 1 mile (b) liters in 1 cubic foot (c) grams in 1 ounce

Why sodium chloride is a neutral compound even though it is made up of ions that have positive and negative charges?

A student monitored the reaction rate of a 0.600M sucrose solution, at 25 oC, and determined that the reaction is first order with respect to sucrose. If at 25.0 oC it takes 3.33-hours for the concentration of the 0.600M solution to drop to 0.300M.

Two skydivers jump out of a plane. As the skydivers are in free fall, the potential energy they possessed at the airplane door Is being converted to kinetic energy True False