Answer:
Carbon Dioxide fire extinguishers extinguish fire by taking away the oxygen element of the fire triangle and also be removing the heat with a very cold discharge. Carbon dioxide can be used on Class B & C fires. They are usually ineffective on Class A fires
The straight horizontal line shows us that the object is moving at a constant speed
Ca(s)+2Hcl(aq) ------>CaCl2(s)+H2(g)
