True or False? Atmospheric oxygen increased after the evolution of photosynthetic prokaryotes.

In which of the following are the symbols and names given correctly for both ions? A. Li-: lithium; OH-: hydroxide B. C2H3O2-: acetate; C2O4-: oxalite C. Cl-: chlorate; O2-: oxide D. PO43-: phosphate; PO33-: phosphite

Discuss the environmental problems caused by the combustion of fossil fuels (a few lines only)

The difference in elevation between the highest and lowest contour lines on a topographical map is called: a. contour interval c. relief interval b. relief d. contour index

20 gallons into liters

Why can't you balance a chemical equation by changing the subscript?

2. What type of bond holds together nitrogen atoms? a. Single Bond b. Double Bond c. Triple Bond d. no bonds hold nitrogen together

Which acid-base pair will always undergo a reaction that produces a neutral solution? answer?

A chemical reaction is carried out in a closed container. The energy absorbed by the chemical reaction is 50 kJ. What is the energy liberated from the air or the walls of the container? A) 50 kJ B) 75 kJ C) 25 kJ D) 100 kJ

Draw the electron-dot structure for chclo. draw the molecule by placing the atoms on the grid and connecting them with bonds. include all lone pairs of electrons.

At stp 5.6 liters of ch4 which element contains the same number of molecules?