Earth isn’t likely going to be running out of gold for around 50-100 years
Answer:
A. electromagnetic energy.
B. thermal energy.
C. solar energy.
D. mechanical energy.
Explanation:
Answer:
It's a physical property because color is chemically not significant.
But occurance of a flame is chemical property because combustion takes place
Answer:
D. Anti-periplanar
Explanation:
In the <u>second step</u> of the intramolecular William Ether Synthesis mechanism (figure 1) we will have the attack of the negative charge of the oxygen to the carbon bond to the Br. At the same time the Br leaves, so a bond would be broken (the <u>C-Br</u> bond) and a bond would be formed (the <u>C-O</u> bond).
Now, this process can happen only if the <u>attack</u> and the <u>leaving group </u>has an anti configuration (figure 2). In an anti configuration the <u>nucleophile</u> and the <u>leaving group</u> would have <u>opposite directions</u>.
<span>FeCl3+ H2O --> Fe(OH)3 + 3 HCl the reaction will cause the least temprature change</span>