Which statement about weak bonds is correct? weak bonds are less important to living things than strong covalent bonds. weak chemical bonds form only between atoms of similar electronegativity. weak bonds are transient and easily reversible.

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.

Which of the following are sources of revenue for media companies? a. direct sales to producers b. advertising and subscriptions c. online purchase d. capital investments