Answer:
Positive; negative
Explanation:
When electrons are lost, a positive ion is formed. A positive ion is called a cation.
When electrons are gained, a negative ion is formed. A negative ion is called an anion.
When you plug in an electrical heater, it turns the electrical energy into radiant energy.<span />
Answer:
Octane - Formula: C8H^18 = Carbon^8 + Hydrogen^18
Explanation: Octane is a compound because there are 8 atoms of carbon and 18 atoms of hydrogen in one molecule of C8H18. There are also 8 moles of carbon and 18 moles of hydrogen.
Answer:
![\Delta _RH=4x10^{-3}\frac{kJ}{mol}](https://tex.z-dn.net/?f=%5CDelta%20_RH%3D4x10%5E%7B-3%7D%5Cfrac%7BkJ%7D%7Bmol%7D)
Explanation:
Hello,
In this case, the molar enthalpy of reaction is obtained by dividing the involved energy by the reacting moles:
![\Delta _RH=\frac{12J}{3mol} =4\frac{J}{mol}](https://tex.z-dn.net/?f=%5CDelta%20_RH%3D%5Cfrac%7B12J%7D%7B3mol%7D%20%3D4%5Cfrac%7BJ%7D%7Bmol%7D)
Thus, it is important to notice that the compound "uses" the energy, it means that it absorbs the energy, for that reason the sign is positive. Moreover, computing the result in kJ/mol we finally obtain:
![\Delta _RH=4\frac{J}{mol}*\frac{1kJ}{1000J} =4x10^{-3}\frac{kJ}{mol}](https://tex.z-dn.net/?f=%5CDelta%20_RH%3D4%5Cfrac%7BJ%7D%7Bmol%7D%2A%5Cfrac%7B1kJ%7D%7B1000J%7D%20%3D4x10%5E%7B-3%7D%5Cfrac%7BkJ%7D%7Bmol%7D)
Best regards.
First blank -Same
Second blank-Neutral