There are three isotopes of silicon. They have mass numbers of 28, 29 and 30. The average atomic mass of silicon is 28.086amu. What does this say about the relative abundances of the three isotopes?

What mass of oxygen is needed to combust and produced 6.4 moles of carbon dioxide gas? C8H12 + 11O2 = 8CO2 + 6H2O

When combining with nonmetallic atoms, metallic atoms generally will (a) lose electrons and form negative ions (b) lose electrons and from positive ions (c) gain electrons and from negative ions (d) gain electrons and form positive ions

Which term names the main class of the chemical that makes up bread?

Group 2 in the penodic table contains the elements beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sf)) barium (Ba) and radium (Ra) What characteristic do these elements share?

A reaction has an equilibrium constant of 7.9*10³ at 298 K. At 713 K, the equilibrium constant is 0.77. Do you predict that the enthalpy of the reaction is positive or negative? Why? a.

Is it possible for 2 different elements to have the same atomic number

How is the mole similar to a dozen?

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?