It is more likely 9. pH 4 is acidic and pH 9 is basic, and as the pH of a substance gets closer to 0 or 14, the substance becomes more corrosive or reactive. As 4 is closer to 0 than 9 is to 14, there is a much higher chance the solution has a pH of 9, because pH 4 is less neutral and therefore more corrosive/reactive than pH 9.
El arroz si produce electricidad:)
The rate of change in velocity<span> is called acceleration.</span>
Its d its the only one that makes sense
Yes, they are the same. They are equivalent.
