Which element is an example of a metalloid? A) gold B) helium C) iron D) silicon

A volleyball is full of pressurized air. The air temperature is 24.6˚C. The volleyball's absolute pressure is 130.75 kilopascals, and its volume is 5.27 liters. How many moles of air are inside the volleyball? A. 0.278 mol B. 3.37 mol C. 3.59 mol D.

One mole of which of these compounds contains two moles of hydrogen atoms? f NaOH g H2S h CH4 j NH3

Two elements that have the same ground-state valence shell configuration of ns 2 np 2 are

A mixture of hydrogen sulfide (H2S) and hydrogen chloride (HCl) :

A narrow channel or slab of a mineral that is different from the surrounding rock is called a a. vein. b. solution. c. crystal. d. metal.

What element with the highest electronegativity value? Cesium calcium helium fluorine

How many neutrons and electrons are in Oxygen⁻¹⁷ isotope?

What is science all about?

What type of change is a substance that changes form but remains the same?

Which side of the mountain experiences high temperature in windward or leeward