Plss, I need this fast! 20 POINTS AND BRAINLIEST GUARANTEED Describe the properties of alkali metals. Based on their electronic arrangement, explain whether they exist alone in nature.

Express the following number in scientific notation. 0.026890 =

Calculate the mass of 0.750 mol of the following substance. na3po4.

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