Some Species of Animals Found in Two Lakes 1964 Lake Alden Cross Lake Trout, snails, heron Heron, beaver, mussels 2004 Lake Alden Cross Lake Heron, snails, trout, mussels Heron, beaver, mussels, trout The tables show some of the species living in two nearby lakes at two different times. The change in the species of each lake is MOST LIKELY the result of — pollution forest fires flooding volcanic eruptions

Ahydrogen atom has 1 electron. how many bonds can hydrogen form? a) 1 b) 2 c) 3 d) 4 e) 5

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.

Given the following equation: 2a1 + 3mgcl2 --> 2alcl3 + 3mg how many moles of aluminum chloride are produced from 2.5 moles of magnesium chloride?