Match each object to its definition. A. meteorite
B. meteoroid
C. meteor
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1. The remains of a rock from space that strikes Earth’s surface

2. A rock that burns up in Earth’s atmosphere

3. A small piece of rock in space

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.

How many molecules are in 6.0 moles of methane

What volume does 1.70 ×10–3 mol of chlorine gas occupy if its temperature is 20.2 °c and its pressure is 795 mm hg?