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Determine the oxidation number for the atoms of each element in the following formulas.   P4       P  [joe1]   PF3     P  [joe2]      F  [joe3]   H3PO4      H  [joe4]      P  [joe5]     O  [joe6]   K3N    K  [joe7]          N  [joe8]

Coffee has a pH of 5 while water has a pH of 7. How much more acidic is the coffee than the water it is made from?

Balance the following equation. if the coefficient is one, put 1 in the blank.     [fish5]Mg +[fish6]Cr(NO3)3 –> [fish7]Mg(NO3)2 + [fish8]Cr

Convert the following numbers expressed in scientific notation to ordinary decimal numbers.   6.99723 x 105  [fish5]   2.333 x 102  [fish6]   3.775 x 10-3  [fish7]   5.1012 x 10-6  [fish8]

What is the difference between a strong acid and a weak acid?

An unknown liquid is poured into a graduated cylinder. Fifty milliliters of the fluid weighs 40 grams. What is the density of the liquid?

Write the formula for the conjugate base of each of the following:   NH4+  [ans5]   H2S  [ans6]   HNO2   [ans7]   HC2O4-  [ans8]

Convert the following ordinary decimal numbers to scientific notation. Note – you will not be able to enter superscripts so use brackets for the exponent. For example, 1.3 x 103 would be entered as 1.3 x 10^3   1,346.41  [fish1]   429,209  [fish2]   0.000002056  [fish3]   0.00488  [fish4]

Write the formula for the conjugate acid of each of the following: HC2O4-  [ans1]   SO32- [ans2]   BrO-  [ans3]   NH2-  [ans4]

Write the chemical formula for a compound made up of two phosphorous atoms and five oxygen atoms. Name the compound. Formula  [joe1] Name  [joe2] Is it an ionic or molecular compound?  [joe3]