Which one of the following chemical equations is balanced? a. nh3 + h2o → 2nh4oh b. 2nacl + h2so4 → hcl + naso4 c. koh + h2 so4 → khso4 + h2o d. 2na + s → 2nas

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?

Asimple electrochemical cell contains two electrodes.

Which is true energy cant be created but can disappear into nowhere or energy is able to be transferred from one into another or all moving objects including atoms have potential energy or an arrow stretched back on a bow is an example of kinetic energy