What do scientists think life developed from?

a.

simple chemicals

c.

photosynthesis

b.

oxygen

d.

a nucleus

How many grams of disulfur decafluoride are present in 2.15 moles of this compound? grams

What is the molar mass, in grams, of a mole of an element equal to?

In which of the following sets is the symbol of the element, the number of protons, and the number of electrons given correctly? F, 19 protons, 19 electrons Cs, 55 protons, 132.9 electrons Zn, 30 protons, 60 electrons In, 49 protons, 49 electrons

Contrast the silica content of magma in quiet and explosive eruptions

State Hund's rule. Choose one: A. An attraction between two electrons occurs due to vibrations in the crystal lattice. B. Each electron goes into the lowest-energy orbital available. C.

Least reactive element of period 3

A chemical formula shows the kind and number of Atoms that form a what? compound, mixture, solution, or suspension

What gas was used as a deadly posiosn in world war 1?

Four moles of hydrogen chloride (HCl) gas react with one mole of oxygen (O2) gas to produce two moles of chlorine gas (Cl2) and two moles of water gas (H2O).

what noble gas electron configuration is achieved by the bromine atoms in a molecule of BR2, a diatomic element?