How many valence electrons does He have

if you had 16 tiles and each tile cost 80 cents how much change would you dmget back if you paid with 2 100 bills

Which of the following happens to a molecule of an object when the object is heated? It moves slower. It's size decreases. It gains kinetic energy. It's temperature decreases.

A sample of an unknown compound was decomposed and found to be composed of 1.36 mol oxygen, 4.10 mol hydrogen, and 2.05 mol carbon. what is the empirical formula of the unknown compound? c3h6o2c2h4o c1.5h3o c2h3o

What is an electrochemical reaction?

Which is NOT true about new scientific theories? A) New theories are always better than old theories. B) New theories are our best available explanations of the world. C) New theories benefit from the development and advances in technology.

If an atom has sp hybridization in a molecule: the maximum number of σ bonds that the atom can form is

What is an oxidizing agent?

In times of hot dry weather some cities ban the use of garden sprinklers why do you think there is such a rule

What is the product of the chemical reaction ... Au+O2

Compare and contrast the compounds CH4 and PH3 in terms of covalent bonding, molecular geometry (shape), and intermolecular forces. Which substance would experience a stronger attraction between its molecules, and why?