The chemical reaction 2Cu + O2 → 2CuO + 315 kJ is an _____ reaction. Endothermic, combustion Exothermic, combustion Endothermic,
2 answers:
Answer: Exothermic
Explanation: Combustion reaction is a chemical reaction in which hydrocarbon burns in the presence of oxygen to form carbon dioxide, water and energy.
Exothermic reactions are those in which energy is released and endothermic reactions are those in which energy is absorbed.
A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution.
As in the given reaction, the energy is released thus reaction s exothermic.
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Answer:
The mass of silver is
Explanation:
Given that,
The volume of the truck is 402 cubic feet or 1.138 x 10⁷ mm.
The density of silver is 10.49 g/mL.
We need to find the mass of silver that will fit in this moving truck. Density equals mass divided by volume. So,
1 gram = 10⁻⁶ Megagram
Hence, the mass of silver is