the atomic nubmer of an element is the total number of which particles in the nucleus? protons, neutrons, electrons, protons and electrons

2NO + O2 → 2NO2 What type of chemical reaction is shown above? a combustion reaction b double displacement C synthesis d decomposition e single displacement

Why does a longer life span mean a higher chance of producing offspring?

To observe small object

The density of iron is about blank times greater than water.

What are some human activities that could have influenced CO2 levels in this period?

A mixture of He He, N 2 N2, and Ar Ar has a pressure of 22.1 22.1 atm at 28.0 28.0 °C. If the partial pressure of He He is 2475 2475 torr and that of Ar Ar is 1049 1049 mm Hg, what is the partial pressure of N 2 N2?

Oceans make the temperaturs of nearby land more extreme ... True or false

The Greek letter D stands for A. Mass of B. Rate of C. Change in D. Heat stored in

14. Two or more substances that are together but do not combine to form a new, pure substance.

A solution of a compound with a known extinction coefficient of 23,100 M-1cm-1 has an absorbance of 0.735 in a 1.30cm path length, what is the concentration of the solution