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Write the chemical formula for a compound made from the ammonium cation and the sulfate anion. Name the compound. Formula  [ann5] Name  [ann6] Is it an ionic or molecular compound?  [ann7]

Assuming that the following numbers are not exact, how many significant figures does each number have?   9,875  [fish9]   102.405  [fish10]   10.000  [fish11]   0.00012  [fish12]

How many protons and electrons do each of the following ions have?                                    Protons                                Electrons N3-  [fay1]     [fay2] Ba2+  [fay3]     [fay4] Br-  [fay5]     [fay6] Al3+  [fay7]     [fay8]

Compounds are two or more elements bonded together. Ionic bonds create ionic compounds while covalent bonds create molecular compounds. Which statement is not true?

What component of the atom gives it its chemical reactivity?

Which element would not have similar characteristics to calcium (Ca).

An isotope has a mass number of 72 and an atomic number of 34. How many neutrons are in each atom of the isotope?  [red4] How many electrons are in each atom?  [red5] If the isotope gained 2 electrons, what would its charge be?  [red6] Such an ion is called a(n)  [red7]

Write a balanced equation for the complete combustion of the following substance as shown below. If the coefficient is one put 1 in the answer block   [dog5]C6H14 + [dog6]O2 –> [dog7]CO2 + [dog8]H2O

Use your calculator to complete the following calculations. Give your answer with the correct number of significant figures.   36.6 / 0.0750             [jim5]   848.8 x 0.6250              [jim6]   (1.206 x 1013) / (6.00 x 106)     [jim7]   (27.001 – 12.866) / 5.000              [jim8]

For the following equation determine the oxidation number for each atom in the equation and identify whether the reaction is a redox reaction or not. If the reaction is redox, identify what is oxidized, what is reduced, the oxidizing agent, and the reducing agent.   2Cr + 3CuSO4 –> Cr2(SO4)3 + 3Cu   Reactants Oxidation Numbers:   Cr       [cat1]   Cu       [cat2]   S          [cat3]   O         [cat4]   Product Oxidation Numbers   Cr       [cat5]   Cu       [cat6]   S          [cat7]   O         [cat8]   Is this a redox reaction?            [cat9]   If it is, what is element is oxidized?  [cat10]   What element is reduced?       [cat11]   What element is the oxidizing agent?          [cat12]   What is the reducing agent?                [cat13]