A.- ¿En qué consiste ajustar una ecuación química?b.- Escriba los 2 métodos para ajustar la ecuación química y en qué consiste cada uno de ellos c.- Balancear las siguientes reacciones por el método de tanteo
C3 H8 + O2 CO2 + H2 O
Na2 CO3 + HCl NaCl + CO2 + H2 O
PBr3 + H2 O HBr + H3 PO3
CaO + C CaC2 + CO
H2 SO4 + BaCl2 BaSO4 + HCl

Heena wants to measure the volume of a ball that is 24 cm across. how should she set up her equation?

On a frictionless air track, a blue glider with mass 0.200 kg is moving to the right with a speed of 8.00 m/s. it strikes a red glider that has mass 0.600 kg and that is initially at rest. after the collision, the blue glider is moving to the left with a speed of 3.00 m/s.(a) what are the magnitude and direction of the velocity of the red glider after the collision? (b) is this collision elastic?

Three resistors are connected in series across a 15-v power supply. if the potential drops across resistors 1 and 2 are 4.1 volts and 3.1 volts, what is the exact potential drop (in volts) across resistor 3?