A force is always a push. true or false ?

What semimetal can form four single covalent bonds.

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

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?