Which of the follow would have similar properties to silicon (Si)? *

Al
Ge
As
He

Compare and contrast physical changes with chemical changes.

Drug abuse will not lead to physical and psychological dependence. true or false ?

Sodium sulfate dissolves as follows: na2so4(s) → 2na+(aq) + so42- (aq). how many moles of na2so4 are required to make 1.0 l of solution in which the na concentration is 0.10 m?