Which of the following items represents a chemical change? burning

melting

evaporation

freezing

Which law is obeyed in the following statement? A reaction has the same amount of atoms of each element on both sides. A Law of conservation of energy B Law of conservation of mass C Law of conservation of atoms D Law of conservation of temperature

Calculate the hydroxide ion concentration [OH-] for a solution with a pH of 6.10

What is the molarity of a 3.0-liter solution that contains 0.45 moles of solute?

What keeps the electrons from leaving an atom in the rutherford model of the atom?

At 65 degrees celsius, which compound has a vapor pressure of 58 kilopascals? 1. ethanoic acid2. ethanol 3. propanone 4. water

What are the coefficients that will balance this skeleton equation? a l c l 3 + naoh → al (oh) 3 + nacl?

Which cluster in the agriculture industry would be most likely to partner with the animal systems cluster to introduce new modern procedures to animal careers

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?