Which radioisotopes have the same decay mode and have half-lives greater than

hour?

(1) Au-198 and N-16 (3) 1-131 and P-32

(2) Ca-37 and Fe-53 (4) Tc-99 and U-233

1. The heating system that uses the energy of the sun to produce heat is a

Match the following with their correct molecular weight. 2-butanone Propyl acetate 4-methyl-2-pentanone Butyl acetate Methanol Ethanol A. 46.07 g/mol B. 116.16 g/mol C. 102.13 g/mol D. 100.16 g/mol E. 32.04 g/mol F. 72.11 g/mol

How to calculate percentage change in mass

Which of these products is made from an animal product? A. A sisal rug B. A silk shirt C. A linen jacket D. Cotton jeans

Which best explains why openness is important

A chemistry student needs 90.0g of glycerol for an experiment. by consulting the crc handbook of chemistry and physics, the student discovers that the density of glycerol is 1.26·gcm-3. calculate the volume of glycerol the student should pour out.

A sulfuric acid solution containing 571.6 g of H2SO4 per liter of solution has a density of 1.329 g/cm3. Calculate (a) the mass percentage, (b) the mole fraction, (c) the molality, (d) the molarity of H2SO4 in this solution.

Darwin visited the Galapagos Islands several times. He observed some very unusual species. One species of bird, the finch, interested him. He observed some differences in the finches living on different islands.

Why does land heat up more faster than water?

Which gas law has assumptions of a fixed amount and temperature of a gas