A man walks 20 meters to the east, he then walks 20 meters back to the west to lock his car. He walks another 30 meters east to the restaurant. What distance did he walk?

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

Nonpoint source pollution is difficult to control because it

When 13.3 g koh is dissolved in 102.7 g of water in a coffee-cup calorimeter, the temperature rises from 21.4 °c to 31.53 °c. what is the enthalpy change per gram of koh (j/g) dissolved in the water? * take the density of water as 1.00 g/ml. * assume that the solution has a specific heat capacity of 4.18 j/g*k. enter to 1 decimal place. do not forget the appropriate sign /(+). canvas may auto-delete the (+) sign