Some students were investigating the speed of a toy car they built. They performed two trials and recorded the data in the table below. What was the average speed of the toy car during the two trials to the nearest tenth of m/s

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

What are the similarities of physical and chemical change ?

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