1 is D - double-replacements do not make solid metals
2 is A - to have complete combustion the original compound must ONLY have C, H and O
3 is B - the elemental Mg replaces the H in the HCl
It would be D (please give me brainliest
Answer: Option C) 9.5
Explanation:
Given that,
pOH of solution = ?
pH of solution = 4.5 (it is an acidic solution because any pH values less than 7.0 is said to be acidic)
Recall that pH is the negative logarithm of hydrogen ion concentration in the solution while pOH is the negative logarithm of hydroxide ion concentration in the solution.
Hence, pH + pOH = 14
4.5 + pOH = 14
pOH = 14 - 4.5
pOH = 9.5
Thus, the pOH of the same solution is 9.5
The chemical energy in food is converted to potential energy stored in the body which is then converted to mechanical and kinetic energy, as a result of motion while running then to heat energy.
<u>Explanation</u>:
- The chemical energy in nourishment is changed over to potential energy stored in the body which is then changed over to mechanical and kinetic energy, because of movement while running then to heat energy.
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The energy bar eaten by Sheila has chemical energy bolted up inside it. This chemical energy is changed over to mechanical energy in a type of potential and kinetic energy and this is changed over to heat energy as the run progresses. Along these lines, the energy changes are chemical energy to mechanical energy [kinetic and potential] and finally to heat energy.
