A number placed in front of an element symbol

Identifique a equação que forma uma base: a) 2NaOH+2SO=Na2SO4+H2O b) 2NO2+2O=HNO2+HNO3 c) H2O+CaO=Ca (OH) 2 d) SO2+H2O=H2SO4 e) 2Mg+O2+2MgO

A rock from the moon contains 12.5 percent of the potassium-40 it began with. how old is the rock

Mr. Fuller assigned his science class a lab comparing the masses of objects to the nearest gram using a balance. The mass of a paper clip is about 1 gram.

What is the purpose of subscripts in chemical formulas?

The heat energy required to change a unit mass of a solid into a liquid at constant temperature is called

The process of gathering knowledge about the natural world

4. Which of the following elements has the greatest electronegativity? a. Krypton b. Bromine c. Phosphorous d. Sulfur

In which orbital does an electron in a nitrogen atom experience the greatest shielding? In which orbital does an electron in a nitrogen atom experience the greatest shielding? 2s 2p 1s 3s 3p

How do u say department store, chase, and market in Spanish?

Approximately how many moles of chlorine make up 1.79 * 1023 atoms of chlorine? A. 2.97 * 10-1 moles B. 2.97 moles C. 6.02 * 1023 moles D. 17.0 moles