Which of the following provides evidence that a chemical change has taken place?

How many electron-containing d orbitals are there in an atom of vanadium?

If you add a large piece of zinc to a beaker of acid and, in a separate beaker, zinc shavings to a beaker of acid (of equal concentration/volume), the sample with the zinc shavings will react faster than the sample with the large piece.

It has been estimated that 8.0 tons of gold have been mined. assume that gold costs $1700 per ounce. what is the total worth of this quantity of gold?

How many moles are there in 1.09 kg of Al (OH) 3? How many formula units are there in 2.55 g of Pb (CO3) 2?

The device shown operates based on a capacitive touch screen. This means that it utilizes an electric current to operate. Why will it operate with your finger but not a piece of plastic? A) Your finger is a conductor but the plastic is not.

Sarah is ordering cheese pizza for a party of ten people she knows each pizza has 8 slices to figure out how many pizzas to order sarah needs to know the

How many grams of sodium ions are in na2so4?

Electron configuration for iron?

Explain how melting is considered endothermic

In the process of covalent bonding, atoms share electrons. This means that * a) Electrons from each atom are attracted to the nucleus of both atoms b) Protons and neutrons attract c) Atoms lose electrons and become ions d) Atoms gain electrons and