Which element has chemical properties that are most similar to the chemical properties of sodium?
(1) mg (3) se
(2) k (4) cl

How much energy is made when a pice of wood burns. how do you know

Which molecules are more strongly attracted to one another -c3h8o molecules that make up liquid rubbing alcohol or ch4 molecules that make up methane gas

1) a light bulb takes in 30 of energy per second. it transfers 3j as use energy. calculate the efficiency. second. it transfers 3j as useful light energy and 27j as heat energy. calculate the efficiency