4. in a chemical reaction, mass is conserved. this means that (1 point) a) the mass of the reactants stays the same during a chemical reaction b) the mass of the products stays the same during a chemical reaction c) the type and number of atoms in the reactants equals the type and number of atoms in the products d) the mass of the products is always twice the mass of the reactants.

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?

Imagine a small synthetic vesicle made from pure phospholipids enclosing an interior lumen containing 1 mm glucose and 1 mm sodium chloride. if the vesicle is placed in pure water, which of the following happens faster? a. na+ diffuses out. b. cl– diffuses out. c. h2o diffuses in. d. glucose diffuses out. e. sodium chloride diffuses out.

Match the vocabulary terms to their definitions. 1 . a long, chain-like set of molecules made up of repeating units joined end to end polymer 2 . a hard, brittle, heat- and corrosion-resistant material made by subjecting a nonmetallic mineral mixture to intense heat ceramic 3 . a plastic with low elongations that cannot be recycled thermoset 4 . a carbon fiber embedded in a polymer resin matrix thermoplastic 5 . a plastic with high elongations that can be recycled crystal 6 . a solid form resulting from the arrangement of atoms, ions, or molecules in definite geometric patterns composite