Chang sees the following formula on a website about
Newton's second law.
What does the symbol EF in the formula indicate that
Chang needs to do?
a-
F
He needs to find the net force acting on the object in a
direction
He needs to use only forces acting in the direction of
motion
He needs to combine the horizontal and vertical forces.
He needs to multiply the horizontal and vertical forces
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Tolerance to high levels of salinity

According to arrhenius theory of acid and bases, an acid is a proton donor, while base donates hydroxyl ions. further, acid and base reacts to form salt and water.consider following example.hcl    +      h2o          →      cl-          +      h3o+here, hcl has donated a proton, hence it is an acid.now consider following reactionhcl      +      naoh            ↔      nacl      +        h2oin this reaction, hcl donates proton, hence it is acid. on other hand, naoh donates hydroxyl ion (i.e. hence it is a base.