Answer:
Atoms are neutral because they have equal numbers of protons (positively charged) and electrons (negatively charged). If an atom gains or loses one or more electrons, it becomes an ion.
Explanation:
Answer:
Petroleum fractions of this kind are commonly known as kerosene. We find that such a mixture of acetone and kerosene will dissolve parafiin wax more eifectively and rapidly than any other solvent hitherto known, and that the wax, when dissolved it will remain in liquid condition indefinitely.
Explanation:
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Efficiency is defined as the measure of the amount of work or energy is conserved in a certain process. At all times, in every process, work or energy is always lost or wasted due to certain interference. Not all work given is converted to useful work or energy. Thus , efficiency is calculated by dividing the energy or work output to the energy or work input then the value is multiplied by 100 to express efficiency as percentage.
Efficiency = work output / work input Efficiency = (1540 J / 1600 J) x 100= 96.25%
Thus, the answer is B.
