What is the usual charge on an ion formed from an atom that originally had five valence electrons? a. 0 b. 3 c. - 3 d. 5

What periodic pattern are noticed for the charges on the ions

Is a pencil breacking a physical change?

Would a solution of baking soda turn pH paper red or blue? Explain your answer in terms of pH.

Aliphatic compounds are formed from a. animal fats b. plant cellulose c. bonding inorganic compound d. bonding hexane and methane molecules in the formation of aromatic compounds

As a substance changes from gas to liquid, how do the particles of the substance change?

The graph below shows how solubility changes with temperature. What is the solubility of Na2HAsO4 at 60°C? 20 g/100 mL of water 46 g/100 mL of water 65 g/100 mL of water 70 g/100 mL of water

Which statement regarding water is true? Energy must be given off in order to break down the crystal lattice of ice to a liquid. Hydrogen bonds are stronger than covalent bonds. Liquid water is less dense than solid water.

Which of the following elements has the fewest valence electrons?. a. beryllium. b. boron. c. carbon. d. lithium

How many molecules are in 4.50 moles of H2O? A. 450 molecules B. 6.02 x 1023 molecules C. 2.71 x 1024 molecules D. 3.00 molecules

A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. How much calcium is contained in 45.0 g of calcium fluoride