I NEED HELP PLZ I HATE CHEMISTRY AND I NEED YOUR HELP WITH THESE TWO QUESTIONS Q1) If we randomly sampled *200* Boron isotopes from nature, how many would be Boron-11?
A. 160
B. 40
C. 22
D. 300
E. 120
Q2) If we randomly sampled *200* Boron isotopes from nature, how many would be Boron-10?
A. 120
B. 160
C. 200
D. 22
E. 40

Construct the hypothetical phase diagram for metals a and b between room temperature (20c) and 700c, given the following information: * the melting temperature of metal a is 480c. • the maximum solubility of b in a is 4 wt% b, which occurs at 420c. • the solubility of b in a at room temperature is 0 wt% b. • one eutectic occurs at 420c and 18 wt% b–82 wt% a. • a second eutectic occurs at 475c and 42 wt% b–58 wt% a. • the intermetallic compound ab exists at a composition of 30 wt% b–70 wt% a, and melts congruently at 525c.• the melting temperature of metal b is 600c. • the maximum solubility of a in b is 13 wt% a, which occurs at 475c. • the solubility of a in b at room temperature is 3 wt% a.

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al

What does a complete balanced chemical equation include? a. exothermic coefficients b. endothermic coefficients c. valence electrons d. molar coefficients