Answer:
Endothermic
It absorbs heat
1.20 × 10³ kJ
Explanation:
Let's consider the following thermochemical equation.
2 H₂O(l) → 2 H₂(g) + O₂(g) ΔH = 572 kJ
Since ΔH > 0, the reaction is endothermic, that is, it absorbs heat when H₂O reacts.
572 kJ are absorbed when 36.03 g of water react. The heat absorbed when 75.8 g of H₂O react is:
75.8 g H₂O × (572 kJ/36.03 g H₂O) = 1.20 × 10³ kJ
Answer:
An ice rink has the least amount of friction.
- Any smooth surface has the least amount of friction.
I hope this helped at all.
Answer:
dimethoxy(phenyl)methanol
Explanation:
For this question, we have to remember the <u>mechanism of the Grignard reaction</u>. In this case, <u>phenylmagnesium bromide</u> is our <u>nucleophile</u>, a carbo-anion is produced (step 1). Then this <u>carbo-anion</u> can <u>attack</u> the <u>carbonyl group</u> in the <u>dimethyl carbonate</u>, the double bond is delocalized into the oxygen producing a <u>negative charge</u> (step 2). Finally, with the addition of the h<u>ydronium ion</u> (
), the anion can be protonated to produce the <u>alcohol</u> (dimethoxy(phenyl)methanol) (step 3).
See figure 1
I hope it helps!
Because as the air hits the charcoal it becomes ash and changes color.