True or false? Molecules are made of atoms of one type

Magnesium and iron are metallic elements. How does a mole of magnesium compare with a mole of iron? A mole of iron has more atoms. They both have the same mass. A mole of magnesium has more mass. They both have the same number of atoms.

When does phenolphthalein turn pink? in the presence of a base in the presence of an acid when it is in a neutral solution when it is reacting with a metal

Rubber is manufactured from latex that is produced from rubber trees. Which statement about rubber is true? It is made from the polymerization of a long chain of aromatic molecules.

Which is the best conductor? Liquid solid or gas?

If a certain metal is placed in an ionic solution containing another metal and no reaction occurs, then the metal originally in the solution is

What chemical process is used to convert oils into fats and semi solids

What is oxidation number of Nitrogen in F2NNO

A rock formed with 1,000 atoms of a radioactive parent element, but only contains 12.5% of its original radioactive parent atoms today. if the half-life is 1,000,000 years, how old is the rock? (ess 4.6)

What is the volume occupied by 0.106 mol of helium gas at a pressure of 0.99 atm and a temperature of 309 K?

I have 4 moles of CO2. How many molecules of CO2 is this?