C. Planets can move at a varying speed due to forces exerted in space.
Answer:
Zinc (Zn) will safely react with dilute sulphuric acid.
Explanation:
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Copper heat capacity would be <span>0.385J/C*gram which means it needs 0.385 Joule of energy to increase 1 gram of copper temperature by 1 Celcius. The calculation would be:
energy= heat capacity *mass * temperature difference
energy= </span>0.385J/C*gram * 6g * (90-20)
<span>energy= 161.7J
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