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

A500g object falls off a cliff and losers 100 j from its gravitational potential energy store. if the gravitational field strength g=9.8n/kg, how high is the cliff?

The vapour pressure of benzene is 53.3 kpa at 60.6 °c, but it fell to 51.5 kpa when 19.0 g of a non-volatile organic compound was dissolved in 500 g of benzene. calculate the molar mass of the compound.

Ablue car pulls away from a red stop-light just after it has turned green with a constant acceleration of 0.5 m/s 2 . a green car arrives at the position of the stop-light 6.5 s after the light had turned green. if t = 0 when the light turns green, at what time does the green car catch the blue car if the green car maintains the slowest constant speed necessary to catch up to the blue car? answer in units of s.