which is greater, the number of compounds or the number of elements? the number of elements or the number of isotopes?

The Goodyear blimp contains 5.74*10^6 L of helium at 25 °C and 1.00 atm. What is the mass in grams of the helium inside the blimp? A. 2.30*10^6 g B. 1.12*10^7 g C. 2.34*10^5 g D. 2.80*10^6 g E. 9.39*10^5 g

You hear a weather forecaster predict thunderstorms. Which kind of clouds would likely be in the sky? cirrus nimbostratus cumulus cumulonimbus

What is the pressure in mm of Hg, of a gas mixture that contains 1g of H2, and 8.0 g of Ar in a 3.0 L container at 27°C.

From their location on the periodic table, identify the oxidation state and number of valence electrons for calcium and chlorine. Then use this information to describe their reactivity.

Consider the reaction below. C2H4 (g) + H2 (g) to C2H6 (g) Which change would likely cause the greatest increase in the rate of the reaction?

Which factor does not influence the rate of a chemical reaction? A. the concentration of reactants B. the surface area of reactants C. the presence of a catalyst D. the volume of the container in which the reaction occurs

Air currents move objects in the air. Explain how a convection current might affect the flight of a hot air balloon

Compare atomic number, mass number, and atomic mass

How does mass affect thermal energy transfer?

Explain whether nitrogen atoms will form bonds with other atoms.