1. If you have 20 grams of parent material and TWO half-lives go by, how much parent material do you have remaining? How much daughter material do you now have?

Which of these changes involve forming or breaking new bonds? a-rusting and cuting b-boiling and melting c-burning and digesting d-burning and melting

What is always true of a combustion reaction? carbon dioxide will be produced the reaction absorbs energy oxygen gas must be one of the reactants one reactant must contain carbon

How are scents or fragrances used in cosmetology? Why would a cosmetologist need to be aware of scents and fragrances?

Is a polyatomic ion electrically neutral?

to prepare 100 mL of a 0.5 M solution of CuSO4 using water as the solvent. Calculate the amount of solid needed.

Why is portion control important

Which ionic compound is the most likely to dissolve in water? CaSO4 Na2SO4 BaSO4 SrSO4

Calcium (atomic number 20) has electron configuration 1s2,2s2,2p6,3s2,3p6,4s2. The atomic number of scandium is 21. Which orbital does the 21st electron enter? a. 3d b. 4p c. 4d d. 4f

In these solutions, identify the solute and the solvent Sea water, a solution composed of a variety of salts dissolved in water. The salt is the Soda water, a solution composed of carbon dioxide gas dissolved in water.

What is an Element and how it different from a Atom?