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What makes the Birchbark Letters of Novgorod a useful primary source for historians?

EXTRA CREDIT!!!What are your thoughts at this point about taking an online chemistry class? Have you listened to any of the pre-recorded Teams sessions found in your Bb content under Unit 1 > Recorded Teams Sessions?  Did you listened to the prerecorded exam 1 review session?   What is helping you learn the objectives covered in the assigned chapters in preparation for the exam?  You must write something to gain credit.

When two pure substances are mixed to form a solution

Since there are substances that dissolve endothermically, then something else is involved in determining whether or not a substance will dissolve. What is this “something else”?

Osmosis is the selective passage of solvent molecules through a porous membrane from a more concentrated solution to a more dilute one.

What is the molarity of a 17.0% by mass solution of sodium acetate, NaC2H3O2 (82.0 g/mol), in water? The density of the solution is 1.09 g/mL.

The energy required to increase the surface of a liquid per unit area is called the

According to OSHA regulations, employers must offer the __________ vaccination series to employees with occupational exposure risk.

Healthcare workers put on PPE.  This stands for: