Blog

Consider a hypothetical field. The concentration of nitrates in the soil is 10 ppm. The concentration of nitrates in the roots of grass growing in the field is 30 ppm. Nevertheless, the roots continue to absorb nitrates from the soil. How is this likely to happen? 

For the following early fetal structures, that is: 1. genital tubercle 2. urogenital groove and 3. labioscrotal swelling provide the matched final Female genital structure with the Final Male genital structure that develops from #1-3 in a normal newborn  (2 points for each correct match). 

What is the charge on the cesium (Cs) ion?

The correct number of significan figures in the number 1.250100 is:

Group 7A elements (group 17) are also called:

In the mass measurement 48.93 g, which digit is estimated?

Given the table of specific heat values below, what is the identity of a 10.0 g metal sample that increases by 14.0oC when 62.9 J of energy is absorbed? Element Specific Heat (J/goC) Au 0.128 Ag 0.235 Cu 0.385 Fe 0.449 Al 0.903

Exact numbers have an unlimited number of significant figures.

The gold foil experiment proved that large regions of the atoms consisted of empty space.

How many protons and electrons are present in the ion O2-?