It is a <u><em>chemical compound</em></u> formed with a metal (mainly positive cations) with oxygen.
It is formed through the air as they react in the air together.
They are also BASES - ALKALINE (so neutralise acids)
Answer: The chemical formula of this precipitate is 
.
Explanation:
An equation which depicts the chemical reaction of substances in the form of chemical formulas is called a chemical equation.
For example, chemical equation for an aqueous solution of sodium phosphate 
and an aqueous solution of magnesium sulfate 
are mixed, a precipitate forms is as follows.
Here, trimagnesium phosphate is the precipitate. The chemical formula of this precipitate is .
Thus, we can conclude that the chemical formula of this precipitate is .
<span>Ethane reacts with oxygen to yield carbon dioxide and liquid water. I believe the correct answer from the choices listed above is option B. The correct equation for this reaction would be as follows:
</span><span>c2h6 (g) + o2(g) = co2(g) + h2o(l)
Hope this answers the question. Have a nice day.</span>
Answer:
(a) -134 kJ (b) -136 kJ
Explanation:
a) Using the accounting of the enthalpy of broken and formed bonds we will have the answer for this question ( remember the enthalpy of bonds broken are positive and those formed are negative)
ΔHrxn(kJ) = 6H (C-H) + 1 (C-C)+ 1H (H) + 1(C=C) + 4(C-H)
= 6(-411) +(-346) +432 + 602 + 4(411)
= - 134 kJ
(b) ΔHrxn = ΔHºf(C2H6) - ΔHºf (C2H4) = -83.75 kJ- 52.3 kJ = -136 kJ
( ΔHºf (H2)) = 0)
